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NAPS (Nissan Anti Pollution System)[1] is a moniker used in Japan to identify vehicles built with emission control technology. The technology was installed so that their vehicles would be in compliance with Japanese Governmentemission regulations passed in 1968. The term was first introduced in Japan, with an externally mounted badge on the trunk of vehicles equipped. Nissan's implementation began with theY44E V8 engine installed in theNissan President along with all vehicles installed with theNissan L engine and theNissan A engine in 1975. The initial introduction of Nissan's technology was the installation of anexhaust gas recirculation valve, followed with the addition of acatalytic converter and an air pump that added oxygen into the exhaust to promote higher temperatures in the catalytic converter, thus cleaning the exhaust further.
The NAPS-Z technology, introduced in 1978, was developed with assistance fromHitachi.[2] It uses a novel implementation of two spark plugs per cylinder, calleddual ignition together with electronically controlled fuel injection, installed on theNissan Z engine. This terminology is often confused with the engine installed in theNissan 280Z, which used the "L" engine. However, the NAPS technology was installed in the Fairlady/Z and sold internationally.
Another version of thetwin spark plug method was introduced on theNissan Stanza with theCA engine, called NAPS-X, which eventually replaced the NAPS-Z approach. The CA engine implemented a hemispherical cylinder head, an approach used by several auto makers.
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