12:1 Compression in LQ9

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Oct 27, 2010 | 03:09 PM

blade7022

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12:1 Compression in LQ9

Has/is anyone run 12:1 in a LQ9? Is it possible. I know -3 dish pistons yeild a low to mid 11 with the 71cc compustion chamber. I guess the quesion is, is it ok to put a +5 dome piston in a LQ9 with the 317 heads?

Thanks for any input.

Oct 27, 2010 | 03:11 PM

blsnelling

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What are you going to run for fuel?

Oct 27, 2010 | 03:17 PM

blade7022

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Quote:

Originally Posted by blsnelling

What are you going to run for fuel?

We get up to 91 here.

Oct 27, 2010 | 03:20 PM

blsnelling

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I think you're going to have issues with that much compression on 91 octane fuel. I have to let those more experienced step in here.

Oct 27, 2010 | 03:23 PM

blade7022

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Quote:

Originally Posted by blsnelling

I think you're going to have issues with that much compression on 91 octane fuel. I have to let those more experienced step in here.

Thanks for the input, I am aware that if I do go that high I will need to buy stock in octane booser

!!!

Oct 27, 2010 | 03:29 PM

bww3588

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From: Chillicothe/Lima, Ohio

if you could get 93, it might be a different story. everyone i talked to said 12:1 will be fine with the correct (read perfect) tune on 93. and if i really wanna go wild with the timing, i got a good supply line on VP MS109.