page_title: Cadillac High Technology engine
section_title: 4.5
hierarchical_section_title: Cadillac High Technology engine / 4.5
caption_attribution_description: English: Cadillac 4.5 L OHV V8 engine
context_page_description: The Cadillac High Technology Engine was a V8 engine produced by the Cadillac division of General Motors from 1982 to 1995.
  While the High Technology engine was being developed, due to higher Corporate Average Fuel Economy standards being phased in by the United States government, Cadillac introduced a variant of their traditional V8 engine with the first usage of cylinder deactivation for 1981 as a stopgap measure to increase the fuel economy of their lineup.
  However, the V8-6-4 engine would experience problems in drivability and reliability related to cylinder deactivation. GM released EPROM updates hoping to increase drivability and reliability, but could not overcome the primitive state of engine control technologies at the time, and the V8-6-4 was discontinued for 1982, with many owners disconnecting the cylinder deactivation system. Cadillac, who planned to introduce their new engine in a line of front-wheel drive models for 1983, was then forced to rush development and production of the High Technology engine for a 1982 introduction in their current rear-wheel drive models.
context_section_description: This was an improved and enlarged version of the HT4100. However, the 4.5 L engine was never classified as HT4500. Engineering advances allowed the company to begin increasing displacement and output again. A bored-out (to 92 mm (3.62 in)) 4.5 L (273 cu in) 4.5 version was introduced in 1988 with 155 hp (116 kW) and throttle body injection. There were various versions of this engine built from its introduction in 1988 to the end of production in 1992 including a high-output LW2 version with multi-port fuel injection which produced 200 hp (149 kW) and 270 lb⋅ft (366 N⋅m) for the Allanté. Outside of the Allanté, Cadillac introduced a port fuel-injected 4.5 L V8 engine in 1990 with 180 hp (134 kW) and 245 lb⋅ft (332 N⋅m) across their car line up.
caption: Cadillac 4.5 L engine
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