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Difference between revisions of "GM LT engine"
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The 92-93 LT1s used speed density fuel management, batch-fire fuel injection and a dedicated engine control module (ECM). In 94 the LT1 switched to a [[mass airflow sensor]] and [[Fuel_injection#Multi-point_fuel_injection|sequential port injection]]. A new, more capable computer controlled the transmission as well as the engine and got a new name: powertrain control module (PCM). Where the ECM held its calibration information in a replaceable chip, the PCM was reprogrammable through the diagnostic port. | The 92-93 LT1s used speed density fuel management, batch-fire fuel injection and a dedicated engine control module (ECM). In 94 the LT1 switched to a [[mass airflow sensor]] and [[Fuel_injection#Multi-point_fuel_injection|sequential port injection]]. A new, more capable computer controlled the transmission as well as the engine and got a new name: powertrain control module (PCM). Where the ECM held its calibration information in a replaceable chip, the PCM was reprogrammable through the diagnostic port. | ||
The early Opti-spark [[distributor]] had durability problems and a revised version was introduced on the 1994 B-Bodies and in 1995 on the Y and F-Bodies. 1996 saw major revisions for [[OBD-II]] - a second catalytic converter on the F-body cars and rear oxygen sensors to monitor catalyst efficiency. Some OBD-II features had been added to the Corvette starting in 1994 for testing purposes. | The early Opti-spark [[distributor]] had durability problems and a revised version was introduced on the 1994 B-Bodies and in 1995 on the Y and F-Bodies. 1996 saw major revisions for [[OBD-II]] - a second catalytic converter on the F-body cars and rear oxygen sensors to monitor catalyst efficiency. Some OBD-II features had been added to the Corvette starting in 1994 for testing purposes. The 1997 model year Camaro and Firebird were the last year for this engine in a GM production car. | ||
The 1992 LT1 in the Y-body was factory rated at {{Convert|300|hp|kW|-1|abbr=on}} and {{Auto lbft|330}}. 96 LT1 Y-bodies were rated at {{Convert|300|hp|kW|-1|abbr=on}} and {{Auto lbft|340}}. The 93-95 F-bodies were rated at {{convert|275|hp|kW}} and {{Auto lbft|325}}, while the 96-97 cars were rated at {{convert|285|hp|kW}} and {{Auto lbft|335}}. | The 1992 LT1 in the Y-body was factory rated at {{Convert|300|hp|kW|-1|abbr=on}} and {{Auto lbft|330}}. 96 LT1 Y-bodies were rated at {{Convert|300|hp|kW|-1|abbr=on}} and {{Auto lbft|340}}. The 93-95 F-bodies were rated at {{convert|275|hp|kW}} and {{Auto lbft|325}}, while the 96-97 cars were rated at {{convert|285|hp|kW}} and {{Auto lbft|335}}. | ||
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==LT5==<!-- This section is linked from [[Lotus Cars]] --> | ==LT5==<!-- This section is linked from [[Lotus Cars]] --> | ||
[[Image:GMLT5.JPG|thumb|right|250px|A GM LT5 engine]] | [[Image:GMLT5.JPG|thumb|right|250px|A GM LT5 engine]] | ||
Immediately prior to the release of the second generation small block, General Motors released a largely unrelated engine which also used the LT name. The LT5 was engineered by a team headed by Terry D. Stinson. | Immediately prior to the release of the second generation small block, General Motors released a largely unrelated engine which also used the LT name. The LT5 was engineered by a team headed by Terry D. Stinson. It was an all-aluminum {{Auto Lrev|349}} small-block V8, but was entirely different from any of the other Chevrolet 350 engines. The bore and stroke were both different at 3.9 by 3.66 in (99 by 93 mm) instead of the usual 4 by 3.48 in (102 by 88 mm) and it featured [[Lotus Cars|Lotus]]-designed 32-valve [[DOHC]] heads. It was hand built by specialty engine builder, [[Mercury Marine]]. This engine produced {{convert|375|hp|kW}} and {{Auto lbft|370}} for the 1990-1992 [[Chevrolet Corvette C4#ZR-1|Corvette ZR-1]] and jumped to {{convert|405|hp|kW}} and {{Auto lbft|385}} for 1993 to its final year in 1995, thanks to cam timing changes and improvements to the engine porting. 1993 also added 4-bolt main bearing caps and an exhaust gas recirculation system. The engine was not used in any other vehicle. | ||
===L99 (4.3L)=== | ===L99 (4.3L)=== | ||