LS7 engine

[S600VXR]

wormus said:

So will you be doing the same for the VXR8? How about a Whipple Supercharged LS7 with 800hp?

Get in line... I asked first!

[greens vauxhall]

We already sell a 600+ package on VXR8 with LS2, currently dont see a future in LS7 though!

[S600VXR]

Pub talk so its important to mention 7ltrs Brian...

[greens vauxhall]

You can always tell 'em ist 7 litres!!

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I bet the red LS7 cover fits

[Boosted LS1]

My take on this is that the ls7 titanium componants (rods and valvetrain parts) are stronger and lighter then the steel equivalent parts. This allows the engine to rev higher and it can also employ a lighter crankshaft with smaller counterweights. The other benefit is that it provides GM with better reliability then if they used steel parts to attain the same objectives.

The steel engine will have a heavier crank and rods, more mass and will be less responsive but the price is right as they say. It's offerred with 6.125" full width rods. Ls7 has a wedged little end so the reciprocating mass with the ls7 is tiddly compared to the SD offering and Manley rod. The ls7 will also be more fuel efficient.

Boosted.

Edited by Boosted LS1 on Tuesday 20th November 16:01

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Titanium isn't always stronger than steel in all instances. The main reason for titanium as the connecting rods is to make use of it's lightness relative to it's strength thus reducing the reciprocating masses and straing on the various bits.

However in situation where revs are low but torque is alot higher (say a high boost supercharger) then titanium doesn't always fair the best and in many cases forged steel is the way to go.

The crank is a good example and you very rarely find titanium based crankshafts - the high performance ones are either forged steel (with some additional chemical treatment) or very exotic metal alloys.