General Motors LS-based small-block engine: Difference between revisions

Revision as of 23:43, 4 April 2005

Revision as of 11:43, 18 April 2005

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==LS1==

The '''LS1''' was an evolution of the earlier LT small-block V8 (and is almost identical to the [[GM LT engine#LT4|LT4]] except for its aluminum construction). It is an all-aluminum 5.7 liter (5665 cc) [[pushrod]] engine and produces 350 hp (261 kW) and 375 ft.·lbf (508 NmN·m) of torque. It shares its block with the higher-output LS6. The LS1 was on the [[Ward's 10 Best Engines]] list for 1998.

It is used in the following vehicles:

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:''LS6 can also refer to a 454 in³ [[Chevrolet Big-Block engine]] of the [[1970s]]''

The '''LS6''' is a higher-output version of [[Chevrolet]]'s [[small-block]] LS1 engine. It is an all-aluminum 5.7 liter (5665 cc) [[pushrod]] engine and produces 405 hp (302 kW) and 400 ft.·lbf (542 NmN·m) of torque. It is used in the high-performance C5 [[Chevrolet Corvette|Corvette]] Z06 model and the [[Cadillac CTS]] V-Series. The C6 Corvette Z06 will get a new [[GM LS engine#LS7|LS7]].

The LS6 shares its block with the [[GM LS1 engine]], but other changes were made. Improved intake, a titanium exhaust, higher-lift cams, and higher compression boosts output, and a new oiling system is better suited to high lateral acceleration.

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==LS2==

The '''LS2''' is the new base engine in the Corvette. It produces 405hp405 hp (302 kW) and 400lbft400 lbf·ft (540 N·m) from a new 6.0 liter V8 based on the old LS1. It is similar to the high-performance LS6, and a higher-performance version of this engine is called the LS7.

Applications:

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The '''LS4''' is a smaller 5.3 L version of the Generation IV block. It is sold for use in trucks as the [[GM Vortec engine#5300|vortec 5300 LH6]].

A version of this engine is adapted for [[transverse]] [[front wheel drive]] application, the first time a small-block family engine has been used in this manner. [[Displacement on Demand]] is also used. Output of this version is 303 hp (226 kW) and 323 ft.·lbf (438 NmN·m).

Applications:

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The '''LS7''' is the latest high-power LS engine. It is a 7.0 L (7008 cc) unit, based loosely on the LS2. The block is changed, with a larger 4.13 in (104.9 mm) bore and longer 4.00 in (101.6 mm) stroke than the LS2. The small-block's 4.4 in (111.8 mm) bore spacing is retained, requiring pressed-in cylinder liners. The [[crankshaft]], and main bearing caps are [[forged]] steel for durability, the connecting rods are titanium, however cast pistons were retained to avoid the piston slap issues that forged pistons have on startup. The two-valve arrangement is retained, though the titanium intake valves have grown to 2.20 in (55.9 mm) and sodium-filled exhaust valves are up to 1.61 in (40.9 mm).

Peak output is 500 hp (373 kW) at 6200 RPM and 475 ft.·lbf (644 NmN·m) at 4800 RPM with a 7000 RPM [[redline]].

The LS7 will be hand-built by the [[General Motors Performance Build Center]] in [[Wixom, Michigan]]. Up to 15,000 LS7s will be produced each year starting in 2005.