10.7:1 compression - ModernCamaro.com - 5th Generation Camaro Enthusiasts
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post #1 of 9 Old 09-08-2008, 09:00 PM Thread Starter
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10.7:1 compression

seems a bit high to add a SC. does anyone know if the ls9 has a lower static compression?

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post #2 of 9 Old 09-08-2008, 09:35 PM
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Originally Posted by geerhed View Post
seems a bit high to add a SC. does anyone know if the ls9 has a lower static compression?

Attached to the crankshaft is a set of titanium connecting rods and forged aluminum pistons, which, when combined with the cylinder heads, delivers a 9.1:1 compression ratio. This combination is extremely durable and lightweight, enabling the LS9's high-rpm capability.


here is the link to the answer !!!!!!

http://jalopnik.com/337672/detroit-a...ful-ls9-engine
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post #3 of 9 Old 09-08-2008, 09:54 PM
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Originally Posted by geerhed View Post
seems a bit high to add a SC. does anyone know if the ls9 has a lower static compression?
yeah, it's a little high...but can be done if you stay conservative with the boost and have a good tune. I'm not an LS motor guru, but you may be able to do some headwork and/or get thicker head gaskets to drop the compression down a bit.


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here is the link to the answer !!!!!!

http://jalopnik.com/337672/detroit-a...ful-ls9-engine
that's a thing of beauty

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post #4 of 9 Old 09-09-2008, 05:32 AM
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Quote:
Originally Posted by POWERFREAK View Post
yeah, it's a little high...but can be done if you stay conservative with the boost and have a good tune. I'm not an LS motor guru, but you may be able to do some headwork and/or get thicker head gaskets to drop the compression down a bit.
I agree. With about 5-6 psi and a proper tune, all will be good!

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post #5 of 9 Old 09-09-2008, 05:43 AM
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the ls9 in the new zr1 is SC making 638 power and im assuming if GM was worried they wouldnt have blown the motor.

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post #6 of 9 Old 09-09-2008, 06:50 AM Thread Starter
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the ls9 in the new zr1 is SC making 638 power and im assuming if GM was worried they wouldnt have blown the motor.
^^

The LS3 is different from the LS9 in specific areas BECAUSE of the supercharger - for example the LS9 has bigger head bolts, and apparently the pistons have a bigger dish for the lower 9.1:1 compression (thanks Daytona).. so if you think gm just slapped a supercharger on the LS3 (what I think I take your comment to mean) you are wrong. (if not please accept my apologies - but then I still would not know what you meant)

I think the aftermarket will come through for us. Out of the box, the LS3 is an incredible piece of work. It will certainly respond well to even the basic bolt ons like exhaust and CAI. what about a set of 3.70's??

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post #7 of 9 Old 09-09-2008, 07:06 AM
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Im lost when were You talking bout a LS3? I know you said"seems a bit high to add a SC. does anyone know if the ls9 has a lower static compression?"

Thats when i Informed about the Zr1 useing a SC=Blower on the LS9 and it working fine.

Oh this is a LS3 Category Maybe Thats where it came from....

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post #8 of 9 Old 09-09-2008, 08:07 AM
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Originally Posted by Modsled View Post
Im lost when were You talking bout a LS3? I know you said"seems a bit high to add a SC. does anyone know if the ls9 has a lower static compression?"

Thats when i Informed about the Zr1 useing a SC=Blower on the LS9 and it working fine.

Oh this is a LS3 Category Maybe Thats where it came from....
the LS9 is 9.1:1...perfect for boost....the LS3 is 10.7:1.

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post #9 of 9 Old 09-09-2008, 01:51 PM
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Originally Posted by POWERFREAK View Post
the LS9 is 9.1:1...perfect for boost....the LS3 is 10.7:1.
I know the LS9 is perfect for Boast I didnt Know what the Comp Ratio Was though So that explain My Post....

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