 | |
| Company type | Joint venture |
|---|---|
| Industry | Automotive |
| Founded | 1997; 29 years ago (1997) |
| Headquarters | , |
Area served | United States |
| Products | Diesel engines |
| Owners | General Motors |
| Website | dmaxengines.com |
DMAX is an American manufacturer of theDuramax V8diesel engines fortrucks, based inDayton, Ohio. Engine production began inMoraine, Ohio in 2000.
DMAX originally was announced in 1997[1] as a 60-40joint venture[2] between and operated byGeneral Motors andIsuzu. Diesel engine production started in July 2000.[3] The company'sDuramax V8 engine has been extremely successful for GM, raising that company's diesel pickup market share to 30% in 2002, up from approximately 5% in 1999.[4]
The DMAX plant was built inMoraine on a land grant site adjacent to a GM plant that made the6.2/6.5 L Diesel V8 designed byDetroit Diesel. Production of that engine began in 1982. The DMAX Moraine plant was completed in 1999,[5] next toMoraine Assembly, which shut down in 2008.[6][7] The DMAX Moraine plant added 80 workers in 2005.[8]
The plant is planning to increase production from 580 engines a day, in 2017, to 700 engines a day.[9] To further expand production, in 2019, GM began construction of a new DMAX plant inBrookville, which would send machined engine components to Moraine for final assembly. Completed engines were shipped from Moraine toFlint, Michigan for assembly into vehicles.[10] The Brookville plant opened in 2021.[5] As of November 2023[update], the daily component production at the Brookville and Moraine plants are 418 blocks and 324 heads; and 500 blocks, 1,440 heads, and 855 crankshafts, respectively. Moraine produces 882 completed engines per day.[5]
According to financial filings, Isuzu wound down its investment in DMAX in May 2022,[5] leaving the company wholly owned by GM. In June 2023, GM announced plans to shift Duramax V8 production from Moraine to an expanded Campus Boulevard plant in Brookville by 2025.[11]
Completed engines are built for the GMC Sierra, Chevrolet Silverado, and Navistar trucks. Short blocks are produced for Gale Banks Engineering, who complete the engines for theJoint Light Tactical Vehicle, and marine fishing boats.[5]
General Motors produced multiple diesel engines under the Duramax brand, but these were not built in Moraine. DMAX, Ltd. exclusively produces the Duramax V8.
| Name | Description | Displacement | Configuration | Based on | Produced | Location |
|---|---|---|---|---|---|---|
| Circle L engine | 1.7 L | I4 | Isuzu4EE2 | 1999–2014? | Isuzu Motors Polska | |
| Duramax I4 engine | 2.8 L | I4 | VM MotoriA 428 | 2015–2022 | GM Rayong in Thailand | |
| Duramax I6 engine | LM2/LZ0 "Baby Duramax" developed for US Light Duty market | 3.0 L | I6 | New Design | 2023–Present | Flint Engine Operations, Flint, Michigan, USA |
