Lt1 Camshaft Change

October 21, 2011 admin Car

Lt1 Camshaft Change

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ProCharger Supercharger Kits - HO Kit with P-1SC [93-97 Chevrolet Camaro LT1] $3096 "With ProCharger technlogy, reliably adding big horsepower to your engine is a lot easier than you may think. Street systems are complete, and daily drivability is unchanged. Intercooled Pro charger systems provide the coolest engine intake charger air temperatures ever, and are so durable they are backed by the industry's best warranty coverage. P-1SC Street/Strip Models self-contained, is a patented design with no oil lines. Emission legal and quiet operation. Power gain ranging from 250-925hp 12 Months Warranty, 50 State Legal Mass airflow massager required for 96-97 LT1's (96-97 only, sold separately), LT1 F-bodies with traction control will require relocation of traction control module(not installed), 1993 LT1 F-bodies require the purchase of larger fuel injectors or an ignition retard system ('93 only, sold separately)"

ProCharger Supercharger Kits - HO Kit with P-1SC [93-97 Pontiac Firebird LT1] $3096 "With ProCharger technlogy, reliably adding big horsepower to your engine is a lot easier than you may think. Street systems are complete, and daily drivability is unchanged. Intercooled Pro charger systems provide the coolest engine intake charger air temperatures ever, and are so durable they are backed by the industry's best warranty coverage. P-1SC Street/Strip Models self-contained, is a patented design with no oil lines. Emission legal and quiet operation. Power gain ranging from 250-925hp 12 Months Warranty, 50 State Legal Mass airflow massager required for 96-97 LT1's (96-97 only, sold separately), LT1 F-bodies with traction control will require relocation of traction control module(not installed), 1993 LT1 F-bodies require the purchase of larger fuel injectors or an ignition retard system ('93 only, sold separately)"

ProCharger Supercharger Kits - HO Intercooled with P600B [93-97 Chevrolet Camaro LT1] $3896 "With ProCharger technlogy, reliably adding big horsepower to your engine is a lot easier than you may think. Street systems are complete, and daily drivability is unchanged. Intercooled Pro charger systems provide the coolest engine intake charger air temperatures ever, and are so durable they are backed by the industry's best warranty coverage. P600B Street/Stip Model are oil-fed superchargers. Power gain ranging from 300-775hp. 36 Months Warranty, 50 State Legal Mass airflow massager required for 96-97 LT1's (96-97 only, sold separately), LT1 F-bodies with traction control will require relocation of traction control module(not installed), 1993 LT1 F-bodies require the purchase of larger fuel injectors or an ignition retard system ('93 only, sold separately)"

ProCharger Supercharger Kits - HO Intercooled with P600B [93-97 Pontiac Firebird LT1] $3896 "With ProCharger technlogy, reliably adding big horsepower to your engine is a lot easier than you may think. Street systems are complete, and daily drivability is unchanged. Intercooled Pro charger systems provide the coolest engine intake charger air temperatures ever, and are so durable they are backed by the industry's best warranty coverage. P600B Street/Stip Model are oil-fed superchargers. Power gain ranging from 300-775hp. 36 Months Warranty, 50 State Legal Mass airflow massager required for 96-97 LT1's (96-97 only, sold separately), LT1 F-bodies with traction control will require relocation of traction control module(not installed), 1993 LT1 F-bodies require the purchase of larger fuel injectors or an ignition retard system ('93 only, sold separately)"

ProCharger Supercharger Kits - HO Intercooled with P-1SC [93-97 Chevrolet Camaro LT1] $4196 "With ProCharger technlogy, reliably adding big horsepower to your engine is a lot easier than you may think. Street systems are complete, and daily drivability is unchanged. Intercooled Pro charger systems provide the coolest engine intake charger air temperatures ever, and are so durable they are backed by the industry's best warranty coverage. P-1SC Street/Strip Models self-contained, is a patented design with no oil lines. Emission legal and quiet operation. Power gain ranging from 250-925hp 12 Months Warranty, 50 State Legal Mass airflow massager required for 96-97 LT1's (96-97 only, sold separately), LT1 F-bodies with traction control will require relocation of traction control module(not installed), 1993 LT1 F-bodies require the purchase of larger fuel injectors or an ignition retard system ('93 only, sold separately)"

ProCharger Supercharger Kits - HO Intercooled with P-1SC [93-97 Pontiac Firebird LT1] $4196 "With ProCharger technlogy, reliably adding big horsepower to your engine is a lot easier than you may think. Street systems are complete, and daily drivability is unchanged. Intercooled Pro charger systems provide the coolest engine intake charger air temperatures ever, and are so durable they are backed by the industry's best warranty coverage. P-1SC Street/Strip Models self-contained, is a patented design with no oil lines. Emission legal and quiet operation. Power gain ranging from 250-925hp 12 Months Warranty, 50 State Legal Mass airflow massager required for 96-97 LT1's (96-97 only, sold separately), LT1 F-bodies with traction control will require relocation of traction control module(not installed), 1993 LT1 F-bodies require the purchase of larger fuel injectors or an ignition retard system ('93 only, sold separately)"

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Heads/Cam LT1

GM LT engine   by jekky

4.00 in bore blocks

LT1

GM LT1 from a 1993 Chevrolet Camaro Z28.

In 1992, GM created a new-generation small-block engine called the LT1, similar to the high-output Generation I LT-1 of the 1970s. It displaced 5.7 L (350 cu in) and was a 2-valve pushrod design. The LT1 used a reverse-flow cooling system which cooled the cylinder heads first, maintaining lower cylinder temperatures and allowing the engine to run at a higher compression than its immediate predecessors.

This engine was used in:

Y-body:

1992-1996 Chevrolet Corvette C4

F-body:

1993-1997 Chevrolet Camaro Z28 and SS

1993-1997 Pontiac Firebird Formula and Trans Am

B-body:

1994-1996 Buick Roadmaster

1994-1996 Chevrolet Caprice

1994-1996 Chevrolet Caprice Police Package

1994-1996 Chevrolet Impala SS

1994-1996 Chevrolet Caprice Wagon

1994-1996 Buick Roadmaster Wagon

D-body:

1994-1996 Cadillac Fleetwood

There were a few different versions of the LT1. All feature a cast iron block, with aluminum heads in the Y and F bodies, and cast iron heads in the B and D bodies. Corvette blocks had four-bolt main caps, while most other blocks were two-bolt main caps.

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 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 Optispark distributor had durability problems and a revised version was introduced with vacuum vents to remove moisture, which can be added to the original version, 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.[citation needed] 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 300 hp (220 kW) and 330 lbft (447 Nm). 96 LT1 Y-bodies were rated at 300 hp (220 kW) and 340 lbft (461 Nm). The 93-95 F-bodies were rated at 275 horsepower (205 kW) and 325 lbft (441 Nm), while the 96-97 cars were rated at 285 horsepower (213 kW) and 335 lbft (454 Nm). The 96-97 WS6 and SS F-bodies were rated at 305 hp (227 kW). The 94-96 B and D-body version was rated at 260 horsepower (190 kW) and 330 lbft (447 Nm).

LT4

The LT4 was a special high-performance version of the new-generation LT1. With the addition of a slightly more aggressive camshaft profile, 1.6:1 roller aluminum rocker arms High flow cylinder heads, and an intake manifold (painted red) port matched to the raised port LT4 cylinder heads, it was rated at 330 horsepower (250 kW) and 340 lbft (461 Nm). It was introduced in the 1996 model year, for the last year of the C4 Corvette, and came standard on all manual transmission (ZF 6-speed equipped) C4 Corvettes. The engine was passed down to special versions of the Camaro and Firebird the next model year.

The LT4 was available on the following vehicles:

1996 Chevrolet Corvette when equipped with 6-speed manual transmission (includes all Grand Sports) (Production: 6,359)

1997 Chevrolet Camaro SLP/LT4 SS 6-speed (Production: 100 for the U.S., 6 for Canada. There were 2 prototypes)

1997 Pontiac Firebird SLP/LT4 Firehawk 6-speed (Production: 29)

All 135 production engines for the Firehawks and Camaro SS were completely disassembled, balanced, blueprinted and honed with stress plates. One in 5 engines was tested on a Superflow engine dyno and every car was tested on a chassis dyno in addition to performing a short 6-mile (10 km) road test.

3.736 in bore blocks

L99 (4.3L)

A 4.3L (263in3) was a 305 with updated block architecture to be Generation II and a reduced 3 inches (76 mm) stroke. It was designated the L99, and was introduced in 1994 for the Chevrolet Caprice. It was externally identical to the LT1, but the bore was 3.736 inches (94.9 mm) and the stroke to 3 inches (76 mm) giving it a displacement of 263 in3. The pistons used in the L99 were the same as the ones used in the Vortec 5000, but 5.94 inches (151 mm) connecting rods were used to compensate for the shorter stroke.

Like the LT1, it features sequential fuel injection, reverse-flow cooling, and an optical ignition pickup. Output is 200 hp (150 kW) and 245 lbft (332 Nm). Due to its smaller displacement, it provides better fuel economy than the 5.7 L LT1, but at reduced horsepower & torque levels.

LT5

A GM LT5 engine

For model year 1990, Chevrolet released the Corvette ZR-1 with the radical overhead cam LT5 engine, which shared only the 4.4 inch bore spacing with any previous LT engine. The LT5 was engineered by a team headed by Mercury Marine Project Engineer Terry D. Stinson.. It was an all-aluminum 5.7 L (349 cu in) small-block V8, but was thoroughly 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-designed 32-valve DOHC heads. It was hand built by specialty engine builder, Mercury Marine in Stillwater, OK. This engine produced 375 horsepower (280 kW) and 370 lbft (502 Nm) for the 1990-1992 Corvette ZR-1 and jumped to 405 horsepower (302 kW) and 385 lbft (522 Nm) 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 used only in Corvettes. The LT5 was very expensive, and after six years of production, GM canceled the ZR-1 option. A total of 6939 were produced. The LT5 however wasn't an evolutionary dead end. Despite being discontinued, a new class of premium V8s for Cadillac and eventually Oldsmobile, the dual overhead cam V8 Northstar and its derivatives, drew heavily from the LT5's design and lessons learned from its production.

See also

GM LS engine

GM Small-Block engine

GM engines

Borg-Warner T-56

References

^ Corvette Fever- Fixing An Opti-Spark Distributor Without Reaching For A Hammer. Andy Bolig

^ http://www.reuters.com/article/pressRelease/idUS20970+20-May-2008+PRN20080520

^ http://www.zr1netregistry.com/ZR1_specs.htm#G

^ http://www.zr1netregistry.com/ZR1_faq.htm#4

^ http://www.cadillacfaq.com/faq/answers/pdf/ls6-article.pdf

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