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

Revision as of 22:15, 21 December 2004

Revision as of 02:39, 4 January 2005

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==LS7==

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]], main bearing caps, and pistons are [[forged]] steel for durability, and the connecting rods are titanium. 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).

The '''LS7''' is the latest high-power LS engine. It is based on the LS2 but is said to be much more powerful. It might even be the first twin-cam pushrod engine. It 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. Displacement may range from 6.3L to 7.0L. The 7.0L mark had already been reached by the [[GM LS1 engine]] series of engines and is most noted in [[Le Mans]] racing with the Corvette C5R. [[GMMG]] [[Berger]] [[Camaro]] [[ZL1]] s made late in 2002 and [[GMMG]] [[Berger]] [[Dick Harrell]] [[Camaro]] s (inspired by the [[Penske]] [[Donahue]] concept car) also featured variations of the 7.0L size.

Peak output is 500 hp (373 kW) at 6200 RPM and 475 ft.lbf (644 Nm) 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.

The 7.0 L mark had already been reached by the LS-series of racing engines, famously in the [[24 Hours of Le Mans]] Corvette C5R. [[GMMG]] [[Berger]] [[Camaro]] [[ZL1]]s made late in 2002 and [[GMMG]] [[Berger]] [[Dick Harrell]] [[Camaro]]s (inspired by the [[Penske]] [[Donahue]] concept car) also featured variations of the 7.0 L size.

==See also==