Difference between revisions of "GM Quad-4 engine"

The '''Quad 4''' (called '''Twin Cam''' after 1995) was a [[DOHC]] and [[SOHC]] [[straight-4]] [[automobile]] engine produced by [[General Motors Corporation|General Motors]]' [[Oldsmobile]] division. It was a modern engine for the time, but was criticized for roughness as well as its longevity{{Fact|date=January 2008}}. [[Balance shaft]]s were added in 1995, also known as a transitional year from the Quad 4 to the renamed TWIN CAM variant,  in 1996 2.4L (LD9) the complete engine makeover was accomplished. The name is derived from the engine's four cylinders and four valve per cylinder layout. There was a [[SOHC|single overhead camshaft]] variant that was produced for a brief time. The Quad 4 used an iron block and an aluminum head.

The Quad 4 debuted in 1987 and was replaced after 2001 by the [[Ecotec]]. Quad 4 engines were produced at GM's Delta Engine Plant (Plant 5) in [[Delta Township, Michigan]]. In recent years, it has gained a minor following in hot rodding circles as a period style engine (which looks like a 1930's [[Offenhauser]] twin cam unit){{Fact|date=January 2008}}.