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Judd (engine)

From Wikipedia, the free encyclopedia
British company
Engine Developments Limited
Company typePrivate limited company
Founded1971 (1971)[1]
Headquarters
Rugby, Warwickshire
,
United Kingdom
ProductsHigh performance racing engines
Websitewww.juddpower.com
Juddas a Formula One engine manufacturer
Formula One World Championship career
First entry1988 Brazilian Grand Prix
Last entry1992 Belgian Grand Prix
Races entered76 (68 starts)
ChassisLigier,March,Williams,Brabham,EuroBrun,Lotus,Leyton House,Life,Dallara,Andrea Moda
Constructors' Championships0
Drivers'
Championships
0
Race victories0
Podiums8
Points86
Pole positions0
Fastest laps3

Judd is a brand of racing car engines built by Engine Developments Ltd., a company founded in 1971 byJohn Judd andJack Brabham inRugby, Warwickshire, England. Engine Developments was intended to build engines for Brabham's racing efforts, and became one of the first firms authorised byCosworth to maintain and rebuild itsDFV engines, but has since expanded into various areas of motorsport.

Judd has provided engines for many major series, includingFormula One,Indycar and other smaller formula series, sports car racing, and touring car racing. They have been associated with manufacturers such asYamaha,MG,Mazda andHonda, although they have mainly been a privateer-engine supplier.

Lower formulae and IndyCar

[edit]
Reciprocating internal combustion engine
Judd AV[2][3][4][5][6]
Overview
ManufacturerUnited Kingdom Judd
Production1984–1990
Layout
Configuration90°V8
Displacement2.6 L (2,643 cc)
Cylinder bore92 mm (3.6 in)
Piston stroke49.7 mm (2.0 in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Compression ratio11:1
Combustion
Fuel systemElectronic fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output740–850 hp (552–634 kW)
Torque output350–470 lb⋅ft (475–637 N⋅m)[7]

As a result of Jack Brabham's long-standing relationship withHonda, Judd was hired by them to develop an engine for the company's return toFormula Two in association withRon Tauranac'sRalt team.

After the demise of Formula Two at the end of the 1984 season, Judd continued to develop new engines for Honda. The first was the Judd AV, aturbochargedV8 engine built for Honda'sCART campaign. It was first used on the CART circuit midway through the1986 season, fielded byGalles Racing and driverGeoff Brabham. It was initiallybadged as theBrabham-Honda, and scored a fourth-place finish at the1986 Michigan 500. In1987, the engine was used for the first time at theIndianapolis 500. RookieJeff MacPherson finished 8th in the engine's first Indy appearance. Brabham scored second-place finishes in 1987 atPocono andRoad America, as well as a third at the season finale at Miami.

The engine became known for its reliability and superior fuel mileage (particularly in the 500-mile races). However, it was at a decided power disadvantage compared to the top engine of the time, theIlmor-Chevrolet.

In 1988,Truesports with driverBobby Rahal took over as the primary team, and the "Honda" name and support was dropped from the powerplant. During the1988 season, Rahal took advantage of the engine's reliability in the 500-mile races, finishing fifth atIndianapolis and second at theMichigan 500. He then scored the first and only Indy car victory for the Judd engine, at the1988 Pocono 500. Rahal's ten top-10 finishes led to a third-place in the season points standings. A year later,Raul Boesel drove a Judd to a 3rd place in the1989 Indianapolis 500, which would be Judd's best Indy 500 result. In that race, all five Judds that qualified were running at the finish, with two in the top ten.

Judd continued to build upgrades to the AV into the early 1990s, even after Honda had stopped badging the engines. When Honda moved into the newFormula 3000 series, Judd again developed the company's engine. Based on the architecture of the AV, the new BV V8 was a naturally aspirated variant, and would eventually form the basis for the Judd CV Formula One engine.

Reciprocating internal combustion engine
Judd BV (Honda RA386E)[8][9]
Overview
ManufacturerUnited Kingdom/Japan Judd-Honda
Production1986–1992
Layout
Configuration90°V8
Displacement3.0 L (183 cu in)
Cylinder bore92 mm (3.6 in)
Piston stroke56.4 mm (2 in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemElectronic fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output470–480 hp (350–358 kW)
Torque output280 lb⋅ft (380 N⋅m)[7]

KV

[edit]
Reciprocating internal combustion engine
Judd KV[10][11][12]
Overview
ManufacturerUnited Kingdom Judd
Production1993–2004
Layout
Configuration90°V8
Displacement3.0 L (183 cu in)
Cylinder bore88 mm (3.5 in)
Piston stroke61.5 mm (2 in)
Cylinder block materialAluminium andmagnesium alloy
Cylinder head materialAluminium and magnesium alloy
Valvetrain32-valve,DOHC, four-valves per cylinder
Compression ratio13:1
Combustion
Fuel systemDirect fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output450–520 hp (336–388 kW)
Torque output290–300 lb⋅ft (393–407 N⋅m)
Dimensions
Dry weight120 kg (265 lb)

After the company's departure from Formula One, Judd returned to Formula 3000 in 1995 with the development of the 3-litre KV V8 engine. Judd built the engines that every Formula 3000 team used, althoughZytek was tasked with maintaining the over 80 engines after they were built. Judd stopped production of the KV and the Formula 3000 series ended in 2004; contrary to rumour, Zytek did not use the KV engine as a basis for theA1 Grand Prix units in 2005, but used their own V8 designed by ex-Judd engineer Hiro Kaneda.[13]

  • 1988 Truesports Judd AV Indy car engine
    1988 Truesports Judd AV Indy car engine
  • 1989 Judd AV 2.65 L V8 Indy car engine
    1989 Judd AV 2.65 L V8 Indy car engine

Formula One

[edit]

In 1988, in conjunction withMarch Engineering, Judd made the move into the recently reintroduced normally aspirated variant ofFormula One, which would completely replace turbocharged cars in 1989. By using the existing BV V8 as the starting point for their new F1 engine, Judd saved cost while at the same time producing a customer engine that could compete on track and in the marketplace with theFord-Cosworth V8s that were standard equipment for the (mostly smaller) teams competing to the new rules.

CV

[edit]
Reciprocating internal combustion engine
Judd CV[14][15]
Overview
ManufacturerUnited Kingdom Judd
Production1988–1990
Layout
Configuration90°V8
Displacement3.5 L (3,498 cc)
Cylinder bore94 mm (3.7 in)
Piston stroke63 mm (2.5 in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output570–610 hp (425–455 kW)
Torque output320–340 lb⋅ft (434–461 N⋅m)
Dimensions
Length540 mm (21 in)
Width545 mm (21.5 in)
Height665 mm (26.2 in)
Dry weight127 kg (280 lb)

The first Formula One engine developed by Judd, the CV, was built to the 3.5-litre engine formula fornaturally aspirated engines. The engine shared many design features with the Judd BV engine, but was expanded to 3.5 litres. March Engineering was the first team who signed to use the Judd CV. Reigning World Constructors' championWilliams was later forced also to turn to Judd, after they lost their supply of Honda engines for 1988. In addition,Ligier also bought CVs for use in the 1988 season. Judd-powered cars finished in podium positions four times during their debut season, with Williams' lead driver,Nigel Mansell, scoring Judd's first podium when he finished second at the very wet1988 British Grand Prix. The other podium finishes were the March ofIvan Capelli finishing 3rd inBelgium (he originally finished 4th on the road and many publications list this as so, but bothBenettonFord's, thus including 3rd placedThierry Boutsen, were disqualified post-season for illegal fuel and Capelli was then officially listed as finishing 3rd). Capelli also finished a strong 2nd behind theMcLarenHonda ofAlain Prost inPortugal before Mansell again finished 2nd, behind Prost, at the very next race inSpain.

During the1988 season, the Judd V8 was originally producing approximately 570 bhp (425 kW; 578 PS) (making Mansell's front row start at the opening race inBrazil all the more remarkable), and through constant development work throughout the season saw power rise to around 590 bhp (440 kW; 598 PS) by season's end (compared to around 610 bhp (455 kW; 618 PS) for theCosworth built and developedFord DFR V8, and around 670 bhp (500 kW; 679 PS) for theHonda V6 turbo). Despite its comparative lack of power, the Judd V8 was commonly the fastest of the non-turbo engines, and the slippery,Adrian Newey designedMarch 881's of Capelli and hisBrazilian team mateMaurício Gugelmin regularly recorded higher speeds through the speed traps than the Ford DFR and the superseded FordDFZ powered cars, with Gugelmin recording the fastest "atmo" speed trap of the season when he hit 312 km/h (194 mph) during qualifying for theGerman Grand Prix atHockenheim (though this was still considerably slower than the turbo-poweredMcLaren Hondas which were timed at 333 km/h (207 mph)).

It was at the race after Spain, the1988 Japanese Grand Prix, where Ivan Capelli's Judd-powered March became the first naturally-aspirated car to lead a lap of a Grand Prix since1983, when he briefly passed the McLaren Honda of two-time World Drivers' champion Alain Prost for the lead on lap 16 of the 51 lap race after Prost missed a gear coming out of theSuzuka Circuit's final chicane. However, the power of the Honda turbo told and by the first corner, Capelli was back to second. Unfortunately Capelli's Judd engine then expired just 3 laps later, ending a solid second half of the season where the Judd engines not only regularly challenged the more powerful Ford DFR used exclusively byBenetton, as the engine to have in the "atmo" class, but also challenged the might of McLaren Honda who through their drivers Prost and that years World Drivers' ChampionAyrton Senna, both won and scored pole in 15 of the 16 races that made up the Formula One season.

For the 1989 season, Judd developed the all-new narrow-angle Judd EV, with a more compact 76-degreeV angle, rather than the more conventional 90 degrees of the Judd AV/BV/CV, and the Cosworth DFV series. Construction of the CV continued as a cheaper alternative for smaller teams while power was upped to around 610 bhp (455 kW; 618 PS).Team Lotus andEuroBrun were the only CV customers, with Lotus finishing sixth in the Constructors' Championship. EuroBrun was originally the only team to continue with the CV unit into 1990, butLife eventually bought CV units to replace their failed in-houseW12 engine design.

EV

[edit]
Reciprocating internal combustion engine
Judd EV[16][9][17]
Overview
ManufacturerUnited Kingdom Judd
Production1989–1992
Layout
Configuration76°V8
Displacement3.5 L (3,495 cc)
Cylinder bore99 mm (3.9 in)
Piston stroke56.75 mm (2.2 in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output620–680 hp (462–507 kW)
Torque output320–400 lb⋅ft (434–542 N⋅m)[18]
Dimensions
Length555 mm (21.9 in)
Width525 mm (20.7 in)
Height615 mm (24.2 in)
Dry weight125–127 kg (276–280 lb)

The previous Judd CV was designed with a conventional 90-degree engine block. Following the 1988 season it was decided that a narrower vee-angle would be adopted to give a more compact engine; the original intent was a 75-degree vee, but limitations in Judd'sCNC equipment (it could only work in even-degree increments) meant that 76 degrees was used instead.

March Engineering upgraded their 1988 CV unit to an EV in 1989, whileBrabham was also supplied with the new engines. Brabham and March each scored one podium with the EV engine. Both teams continued with the EV in 1990, although March Engineering was renamedLeyton House Racing. Leyton House took the engine's only podium of the season, a second place at theFrench Grand Prix. For 1991, Team Lotus was the only team to use the older EV.

GV

[edit]
Reciprocating internal combustion engine
Judd GV[14]
Overview
ManufacturerUnited Kingdom Judd
Production1991–1992
Layout
Configuration72°V10
Displacement3.5 L (3,496 cc)
Cylinder bore92 mm (3.6 in)
Piston stroke52.6 mm (2.1 in)
Valvetrain40-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output750 hp (559 kW)
Torque output345 lb⋅ft (468 N⋅m)
Dimensions
Dry weight130 kg (287 lb)

In the normally aspirated 3.5 litre formula, ten and twelve cylinder engines had proved to be more powerful than V8s. This prompted Judd to replace the CV and EV V8s with an all-new engine in 1991 for theBMS Scuderia Italia team. The new 72-degree angleV10 engine would carry the GV name. The engine was powerful, helping the team to a podium finish in theSan Marino Grand Prix.

Judd's agreement with Scuderia Italia ended following the 1991 season, leaving the GVs to be used by the Brabham team and newcomersAndrea Moda Formula in 1992. Neither team scored a point all season and Judd Engines pulled out of Formula One.

Yamaha partnership

[edit]

Following Judd's withdrawal from Formula One in 1992, John Judd turned toYamaha to continue production of his engines. Using the Judd GV V10 as a base, Yamaha developed an all-new cylinder head and branded the motor as the OX10, for use byTyrrell Racing in1993. Once again, Tyrrell were unable to score any points all season. An improved OX10B for1994 boosted Tyrrell's performance, as the team scored a podium and finished sixth in the Constructors' Championship.

Rule changes in1995 saw the OX10C (known by Judd as the HV) reduced to 3 litres, although the architecture of the engine was generally the same. Tyrrell's performance fell off again however, as the team scored five points and finished eighth in the championship.1996 saw the same points total from Tyrrell, although the new Yamaha OX11 (Judd JV) engine was an all-new design. After 1996 Tyrrell switched to using Ford-branded engines.

An updated C-Spec version of the OX11 was used byArrows in1997. Featuring a new bottom end, with changes consisting of a revised sump, crankshaft, oil pump and water pump; the OX11C had an extremely low centre of gravity (and a dry weight of 105 kg vs the Renault RS09's 121 kg) but was underpowered (708 bhp vs the RS09's 755 bhp) and most of all unreliable.

Consequently, a D-Spec was introduced for the fourth race, atImola, with significant improvements in the airflow management of the combustion chamber area, which permitted the OX11D to gain 20 hp, which along with superior Bridgestone tyres propelledDamon Hill to a second place at theHungaroring, the 11th race of a year that otherwise was pretty lacklustre withPedro Diniz's 5th place at theNürburgring as a last high point before Yamaha consequently pulled the plug on the failing project.

  • 1993 Yamaha OX10A engine, a variant of the Judd GV engine
    1993 Yamaha OX10A engine, a variant of the Judd GV engine
  • 1997 Yamaha OX11C engine, a variant of the Judd JV engine
    1997 Yamaha OX11C engine, a variant of the Judd JV engine

Complete Formula One World Championship results

[edit]

(key) (Races inbold indicate pole position) (Races initalics indicate fastest lap)

YearEntrantChassisEngineTyresDrivers1234567891011121314151617Pts.WCC
1988Leyton House
March Racing Team
March 881Judd CV 3.5V8GBRASMRMONMEXCANDETFRAGBRGERHUNBELITAPORESPJPNAUS226th
Maurício GugelminRet15RetRetRetRet8485Ret8Ret710Ret
Ivan CapelliRetRet10165DNS9Ret5Ret352RetRet6
Ligier LotoLigier JS31Judd CV 3.5V8GRené ArnouxRetDNQRetRetRetRetDNQ1817RetRet1310Ret17Ret0NC
Stefan Johansson9DNQRet10RetRetDNQDNQDNQRet11DNQRetRetDNQ9
CanonWilliams TeamWilliams FW12Judd CV 3.5V8GNigel MansellRetRetRetRetRetRetRet2RetRetRet2RetRet207th
Martin Brundle7
Jean-Louis Schlesser11
Riccardo PatreseRet136RetRetRetRet8Ret6Ret7Ret564
1989Motor Racing DevelopmentsBrabham BT58Judd EV 3.5V8PBRASMRMONMEXUSACANFRAGBRGERHUNBELITAPORESPJPNAUS89th
Martin BrundleRetRet69RetDNPQDNPQRet812Ret68Ret5Ret
Stefano ModenaRetRet310RetRetRetRetRet11RetEX14RetRet8
EuroBrun RacingEuroBrun ER188B
EuroBrun ER189
Judd CV 3.5V8PGregor FoitekDNQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQ0NC
Oscar LarrauriDNPQDNPQDNPQDNPQDNPQ
Leyton House
March Racing Team
March 881Judd CV 3.5V8GMaurício Gugelmin3Ret412th
Ivan CapelliRetRet
March CG891Judd EV 3.5V8Maurício GugelminRetDNQDSQRetNCRetRetRet7Ret10Ret77
Ivan Capelli11RetRetRetRetRetRetRet12RetRetRetRetRet
CamelTeam LotusLotus 101Judd CV 3.5V8GNelson PiquetRetRetRet11Ret48456DNQRetRet84Ret156th
Satoru Nakajima8NCDNQRetRetDNQRet8RetRetDNQ107RetRet4
1990Motor Racing DevelopmentsBrabham BT58
Brabham BT59
Judd EV 3.5V8PUSABRASMRMONCANMEXFRAGBRGERHUNBELITAPORESPJPNAUS210th
Stefano Modena5RetRetRet711139RetRet17RetRetRetRet12
Gregor FoitekRetRet
David BrabhamDNQRetDNQRet15DNQRetDNQRetDNQRetDNQRetRet
EuroBrun RacingEuroBrun ER189BJudd CV 3.5V8PRoberto Moreno13DNPQRetDNQDNQEXDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQ0NC
Claudio LangesDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQDNPQ
Leyton House RacingLeyton House CG901Judd EV 3.5V8GMaurício Gugelmin14DNQRetDNQDNQDNQRetDNSRet86Ret128RetRet77th
Ivan CapelliRetDNQRetRet10DNQ2Ret7Ret7RetRetRetRetRet
Life Racing EnginesLife L190Judd CV 3.5V8GBruno GiacomelliDNPQDNPQ0NC
1991Scuderia ItaliaDallara F191Judd GV 3.5V10PUSABRASMRMONCANMEXFRAGBRGERHUNBELITAPORESPJPNAUS58th
Emanuele PirroRet11DNPQ69DNPQDNPQ1010Ret810Ret15Ret7
JJ LehtoRetRet311RetRetRet13RetRetRetRetRet8Ret12
Team LotusLotus 102BJudd EV 3.5V8GMika Häkkinen1395RetRet9DNQ12Ret14Ret1414RetRet1939th
Julian BaileyDNQDNQ6DNQ
Johnny HerbertDNQ1010147RetRet11
Michael BartelsDNQDNQDNQDNQ
1992Andrea Moda FormulaAndrea Moda C4B
Andrea Moda S921
Judd GV 3.5V10GRSAMEXBRAESPSMRMONCANFRAGBRGERHUNBELITAPORJPNAUS0NC
Alex CaffiEXDNP
Enrico BertaggiaEXDNP
Roberto MorenoDNPQDNPQDNPQRetDNPQDNADNPQDNPQDNQDNQ
Perry McCarthyDNPDNPQDNPQDNPQDNPDNADNPQEXDNPQDNQ
Motor Racing DevelopmentsBrabham BT60BJudd GV 3.5V10GEric van de Poele13DNQDNQDNQDNQDNQDNQDNQDNQDNQ0NC
Giovanna AmatiDNQDNQDNQ
Damon HillDNQDNQDNQDNQDNQ16DNQ11
Engines badged asYamaha
1993Tyrrell Racing OrganisationTyrrell 020C
Tyrrell 021
Yamaha OX10A
(Judd GV) 3.5V10
GRSABRAEURSMRESPMONCANFRAGBRGERHUNBELITAPORJPNAUS0NC
Ukyo KatayamaRetRetRetRetRetRet17Ret13Ret101514RetRetRet
Andrea de CesarisRetRetRetRetDSQ10Ret15NCRet11Ret1312Ret13
1994Tyrrell Racing OrganisationTyrrell 022Yamaha OX10B
(Judd GV) 3.5V10
GBRAPACSMRMONESPCANFRAGBRGERHUNBELITAPOREURJPNAUS137th
Ukyo Katayama5Ret5RetRetRetRet6RetRetRetRetRet7RetRet
Mark BlundellRetRet9Ret31010RetRet55RetRet13RetRet
1995Nokia Tyrrell YamahaTyrrell 023Yamaha OX10C
(Judd HV) 3.0V10
GBRAARGSMRESPMONCANFRAGBRGERHUNBELITAPOREURPACJPNAUS58th
Ukyo KatayamaRet8RetRetRetRetRetRet7RetRet10Ret14RetRet
Gabriele Tarquini14
Mika Salo7RetRet10Ret7158RetRet8513101265
1996Tyrrell YamahaTyrrell 024Yamaha OX11A
(Judd JV) 3.0V10
GAUSBRAARGEURSMRMONESPCANFRAGBRGERHUNBELITAPORJPN58th
Ukyo Katayama119RetDSQRetRetRetRetRetRetRet781012Ret
Mika Salo65RetDSQRet5DSQRet1079Ret7Ret11Ret
1997Danka Arrows YamahaArrows A18Yamaha OX11C/D
(Judd JV) 3.0V10
BAUSBRAARGSMRMONESPCANFRAGBRGERHUNBELITAAUTLUXJPNEUR98th
Damon HillDNS17RetRetRetRet91268213Ret7812Ret
Pedro Diniz10RetRetRetRetRet8RetRetRetRet7Ret13513Ret

Sports car racing

[edit]

GV10

[edit]
Reciprocating internal combustion engine
Judd GV10[19][20][21]
Overview
ManufacturerUnited Kingdom Judd
Production1992–1993
Layout
Configuration72°V10
Displacement3.5 L (3,498 cc)
Cylinder bore94 mm (3.7 in)
Piston stroke50.4 mm (2.0 in)
Valvetrain40-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output650–700 hp (485–522 kW)[22][23]
Torque output250–294 lb⋅ft (339–399 N⋅m)
Dimensions
Dry weight135–145 kg (298–320 lb)

In 1991, theWorld Sportscar Championship introduced an engine formula nearly identical toFormula One. This was an attempt to decrease cost by allowing sportscar teams to purchase Formula One engines, while at the same time encouraging major sportscar manufacturers to enter Formula One. This allowed for Judd to offer their GV V10 to customers following modifications to meet the endurance requirements necessary in the World Sportscar Championship.

As financial troubles hit other teams, the Judd V10 became one of the few privately funded engines for the topC1 class.Mazda was forced to turn to Judd to replace their outlawed rotary engines, although the GV10s would be rebadged as Mazda MV10s. Euro Racing, also purchased GV10s for theirLola T92/10s. Mazda finished third in the team's championship while Euro Racing took fifth.

The World Sportscar Championship was cancelled in 1993, quickly ending Judd's first brief involvement in sports car racing.

GV4

[edit]
Reciprocating internal combustion engine
Judd GV4[24][25]
Overview
ManufacturerUnited Kingdom Judd
Production1999–present
Layout
Configuration72°V10
Displacement4.0 L (3,997 cc)
Cylinder bore94 mm (3.7 in)
Piston stroke57.6 mm (2.3 in)
Valvetrain40-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output730–750 hp (544–559 kW)
Torque output332–375 lb⋅ft (450–508 N⋅m)
Dimensions
Dry weight135–145 kg (298–320 lb)

After engine involvement withYamaha in Formula One, Judd returned once again to sports car racing. Believing that a large naturally aspirated engine would be fitting for use as a customer supply in theSports Racing World Cup, Judd resurrected the GV10 from a few years earlier. Expanded to four litres and upgraded with new technology, the new GV4 became a favorite choice for teams not running the dominantFerrari 333 SP, eventually winning the championship withRacing for Holland in2002 and2003. In2000, aDoran Ferrari 333 SP-Judd hybrid appeared, the performance of the Judd engine being deemed superior to that of the six-year-old Italian unit, which was no longer supported by Ferrari.

The GV4s also became powerful enough to contest for overall wins in the24 Hours of Le Mans, withOrecaDallaras running the GV4 finishing fifth and sixth in2002 as well as an overall victory for Doran Lista at theRolex 24 at Daytona the same year. The engine's reliability record at Le Mans was still patchy and, while it could challenge for the pole inDomes and Dallaras, the engine RPMs had to be reduced to ensure it survived the race.

GV4.2

[edit]
Reciprocating internal combustion engine
Judd GV4.2[26]
Overview
ManufacturerUnited Kingdom Judd
Production2013–present
Layout
Configuration72°V10
Displacement4.2 L (4,198 cc)
Cylinder bore94 mm (3.7 in)
Piston stroke60.5 mm (2.4 in)
Valvetrain40-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output750–775 hp (559–578 kW)
Torque output383–430 lb⋅ft (519–583 N⋅m)
Dimensions
Dry weight135 kg (298 lb)

The 4.2-litre GV V10 engine was designed and developed for the 2013 season as a result of the remarkable success of the GV4 engine in the Boss series. Compared to the 4.0-litre GV V10 engine, the 4.2-litre GV V10 has been modernized; with lighter cylinder heads, twin-barrel throttles, and a lower centre of gravity. The engine is also 10 kg lighter than the 4-litre version. The engine made its race debut inApril 2013 at theHockenheim circuit in Germany, scoring a double victory on its debut. The engine was expertly installed in the Benetton chassis by Kevin Mansell.

Further success has followed in the2014,2015 and2016 seasons.

KV675

[edit]
Reciprocating internal combustion engine
Judd KV675[27]
Overview
ManufacturerUnited Kingdom Judd
Production2001–2005
Layout
Configuration90°V8
Displacement3.4 L (3,392 cc)
Cylinder bore94 mm (3.7 in)
Piston stroke61.1 mm (2.4 in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemElectronic fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output450 hp (336 kW)
Torque output265 lb⋅ft (359 N⋅m)

In 2001, theAutomobile Club de l'Ouest (ACO), organisers of the 24 Hours of Le Mans, announced new regulations forLe Mans Prototypes. The smaller LMP675 category would allow naturally aspirated V8 engines up to 3.4 litres. Using the design of theFormula 3000 KV V8, Judd expanded the engine to the maximum of 3.4 litres and reinforced it forendurance racing, creating the KV675.

In its debut year, the KV675 won the LMP675 championship in theAmerican Le Mans Series for Dick Barbour Racing. However, factory-supported efforts byMG and thenZytek were the dominant efforts in LMP675, so the KV675 only won its class at the2004 24 Hours of Le Mans. It also won the LMP2 class championship in the ALMS in2005. Both victories were forIntersport Racing, installed at the back of theirLola B2K/40.

GV5

[edit]
Reciprocating internal combustion engine
Judd GV5[28][29]
Overview
ManufacturerUnited Kingdom Judd
Production2004–2012
Layout
Configuration72°V10
Displacement4,997 cc (5.0 L; 304.9 cu in)
5,496 cc (5.5 L; 335.4 cu in)
Cylinder bore94 mm (3.7 in)
Piston stroke72 mm (2.8 in)
79.2 mm (3.1 in)
Valvetrain40-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Oil systemDry sump
Output
Power output800–829 bhp (597–618 kW; 811–840 PS)
Torque output445–550 lb⋅ft (603–746 N⋅m)
Dimensions
Dry weight135–159 kg (298–351 lb)

In 2002, Judd introduced a variant of the GV4 known as the GV5. The engine capacity increase to five litres was an attempt to reduce rpms, increase torque, and increase reliability. The GV5 quickly proved its superiority over the GV4, when it took second place in the teams' championship in theRolex Sports Car Series in its debut year with DoranPescarolo Sport later went on to finish fourth at the2004 24 Hours of Le Mans with a GV5. The following year, Pescarolo finished in second place atLe Mans and won the teams' championship in theLe Mans Endurance Series.

The GV5 received an upgrade in 2006, using lighter materials to decrease the weight of the unit by 20 kg.[30] The GV5 S2 showed its performance by taking the Pescarolo to second place once again at Le Mans behindAudi'sR10 TDI, as well as winning every event in theLe Mans Series season.

The engine was further upgraded in 2007, with an increase in displacement to 5.5 litres to produce more torque while attaining the maximum power at lowerrpms and improving fuel consumption, as the Judd GV5.5 S2.[31]

XV675

[edit]
Reciprocating internal combustion engine
Judd XV675[32]
Overview
ManufacturerUnited Kingdom Judd
Production2004–2008
Layout
Configuration90°V8
Displacement3.4 L (3,395 cc)
Cylinder bore92.9 mm (3.7 in)
Piston stroke62.6 mm (2.5 in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemElectronic fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output540 hp (403 kW)
Torque output270–350 lb⋅ft (366–475 N⋅m)

In an attempt to displaceFord andCosworth as the only supplier of engines in theChamp Car World Series, Judd proposed a variant of the KV675 for use in the series through an agreement with MG, who would badge the engine. The deal did not come to fruition, but the development work performed based on the KV675 to adapt it to Champ Car was transferred to sports car racing. The improved engine, known asXV675, retained the 3.4-litre layout but included technology developed from the GV series of engines to increase revs and performance while reducing weight.

The XV675 debuted in 2004 with mixed success.Ray Mallock Ltd. earned the XV675 one of its few successes, winning the LMP2 class at the2005 24 Hours of Le Mans, but the team later switched to theAdvanced Engine Research turbocharged LMP2 engine which had become dominant in the class. It was used until 2008.

DB

[edit]
Reciprocating internal combustion engine
Judd DB[33][34][35]
Overview
ManufacturerUnited Kingdom Judd
Production2004–2012
Layout
Configuration90°V8
Displacement3.0–4.4 L (183–269 cu in)
Valvetrain32-valve,DOHC, four-valves per cylinder
Combustion
Fuel systemDirect fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output540–670 hp (403–500 kW)
Torque output267–352 lb⋅ft (362–477 N⋅m)
Dimensions
Dry weight110–116 kg (243–256 lb)[36][37]

On September 12, 2007, Engine Developments announced their plans for a replacement for the XV675, termed the DB. Although it retained the 3.4-litre engine capacity, the unit was entirely new. Judd planned to work closely with a top LMP2 team in order to get better testing out of the DB in 2008 before the engine was released to any customers.[38] The engine was found at the back of the numerousLola B08/80 LMP2 cars in the LMS championship where it competed against theZyteks and thePorsche RS Spyders.

HK

[edit]

The Judd HK engine, also known as theJudd-BMW HK, was introduced in 2011, in accordance with new regulations set forth by the ACO for engines in the LMP2 class to be based on production engines to lower costs.[39][40] The base of the engine is the 4.0 litre V8,BMW S65, that was fitted to theE90 M3.[41] The engine was designated, "HK", after Hiro Kaneda who had died in 2010 and who designed the AIM (GV5.5 S2) V10 engine.[42] It appeared in cars such as theLigier JS P2,Lola B11/40,Lola B12/80,Norma M200P,Oreca 03 and thePescarolo 01, across multiple series in North America, Europe and Asia.[39][43]

Reciprocating internal combustion engine
Judd HK[44]
Overview
ManufacturerUnited Kingdom Judd
Production2011–2016
Layout
Configuration90°V8
Displacement3.6 L (3,597 cc)
Cylinder block materialAluminium alloy
Cylinder head materialAluminium alloy
Valvetrain32-valve,DOHC, four-valves per cylinder
Valvetrain drive systemBelt
RPM range
Max. engine speed10,000
Combustion
Fuel systemElectronic fuel injection
ManagementMotec M1 series
Fuel typeGasoline
Oil systemDry sump
Output
Power output475 hp (354 kW)
Torque output300 lb⋅ft (407 N⋅m)
Dimensions
Length584 mm (23 in)
Dry weight140 kg (309 lb)

Touring car racing

[edit]

In 1997, Engine Developments was chosen byNissan Motors to lead their engine development program on thePrimera for theBritish Touring Car Championship. Nissan went on to win the constructors' championship in 1998 and 1999, withLaurent Aïello winning the driver's title in 1999.

As part of MG's involvement with Judd elsewhere, the two worked together on MG's return to the British Touring Car Championship in 2004. Judd developed the K2000 engine for theMG ZS, withAnthony Reid finishing fourth in the driver's championship in their debut year. However, MG's financial troubles forced the company to drop out of the championship soon after, leaving the K2000 open to customers. Des Wheatley installed the engine in anMG Metro and won the BritishRallycross Championship.

References

[edit]
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  2. ^"Popular Mechanics". Hearst Magazines. May 1987.
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  4. ^"The Astonishing Story of the Judd V8 Engine". 25 June 2020.
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  6. ^"Judd Indy Car V8 Engine is a Different Kind of Boosted Bullet". 21 March 2018.
  7. ^ab"Spicer Horsepower and Torque Calculator".
  8. ^"1992 Ralt RT24 F3000".Motorsports Market.
  9. ^ab"British Grand Prix Preview -- Judd".Motor Sport Magazine. 7 July 2014.
  10. ^"Zytek KV F3000 - technical specifications". Archived fromthe original on 11 October 2021. Retrieved11 October 2021.
  11. ^"JUDD KV V8 F3000 Zytek Racing Engine". 10 November 2016.
  12. ^"New member - Bought an RA107 - Page 8 - F1technical.net".
  13. ^"JUDD KV V8 F3000 Zytek Racing Engine". 10 November 2016. Retrieved8 December 2020.
  14. ^ab"Engine Judd • STATS F1".
  15. ^"1989 Lotus 101 Judd Specifications".
  16. ^"1990 Leyton House CG901 Judd Specifications - Ultimatecarpage.com".
  17. ^"Engine Judd • STATS F1".www.statsf1.com.
  18. ^"Judd EV".racecarsdirect.com. Archived fromthe original on 26 November 2022. Retrieved26 November 2022.
  19. ^"Lola T92/10 group C (1992) - Racing Cars".
  20. ^"Secondhand Smoke - 1992 Lola T92/10 Judd". 22 July 2018. Archived fromthe original on 11 October 2021. Retrieved11 October 2021.
  21. ^"Lola T92/10 Group C - EPIC V10 N/A Judd Engine Sound, Warm-Up - Action at Paul Ricard & Goodwood FOS".YouTube. 7 February 2021.
  22. ^"1992 Lola Sports Car - T92/10 Group C".
  23. ^"Lola T92/10 World Sportscar Championship 1992". 9 May 2014.
  24. ^"JUDD 4GV 4L V10 | le Mans Engine". 9 November 2016.
  25. ^"Mulsanne's Corner: Engine Developments Judd GV4 V10".www.mulsannescorner.com.
  26. ^"JUDD GV 4.2L V10 | Boss Series Engine". 9 November 2016.
  27. ^"Judd KV675 (2001) - Racing Cars".tech-racingcars.wikidot.com.
  28. ^"JUDD GV 5.0 & 5.5L V10 | le Mans Engine". 9 November 2016.
  29. ^"Mulsanne's Corner: Engine Developments Judd GV5 V10".www.mulsannescorner.com.
  30. ^"GV5 S2 Runs For The First Time". Engine Developments. 24 January 2006. Archived fromthe original on 10 September 2006. Retrieved13 September 2006.
  31. ^"New Engine for 2007". Engine Developments. 13 July 2006. Archived fromthe original on 27 September 2007. Retrieved13 September 2006.
  32. ^"Judd XV675 (2005) - Racing Cars".tech-racingcars.wikidot.com.
  33. ^"JUDD DB 3.4 & 4.0L V8 | Hillclimb Engine". 9 November 2016.
  34. ^"Mulsanne's Corner: Engine Developments Judd DB V8".
  35. ^"Judd DB". 24 May 2008.
  36. ^"DOHC, 90 degree, V* racing engines". 25 September 2009.
  37. ^"Mercedes-Judd SLK340 – Engine Swap Depot".engineswapdepot.com. 10 June 2016.
  38. ^"Engine Developments Introduces New Judd LMP2 Engine". The-Paddock.net. 12 September 2007. Archived fromthe original on 23 October 2007. Retrieved12 September 2007.
  39. ^ab"JUDD HK V8 LMP2 | Motorsport Engine".Judd Power. 9 November 2016. Archived fromthe original on 16 April 2025. Retrieved22 November 2025.
  40. ^"2011 LMP2 Judd Engine Announced".archive2.dailysportscar.com. 9 September 2010. Retrieved22 November 2025.
  41. ^"Mulsanne's Corner: Engine Developments Judd HK V8".www.mulsannescorner.com. Archived fromthe original on 26 September 2023. Retrieved22 November 2025.
  42. ^"Hiro Kaneda - 1949-2010".archive2.dailysportscar.com. 16 February 2010. Retrieved22 November 2025.
  43. ^Dagys, John (29 January 2015)."Negri Completes Krohn Racing Lineup in ELMS".Sportscar365. Retrieved22 November 2025.
  44. ^"Judd HK (2011) - Racing Cars".tech-racingcars.wikidot.com.

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