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Am I calculating compression wrong?

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Old Aug 24, 2017 | 02:17 PM
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Default Am I calculating compression wrong?

Trying to figure out what my compression would be for my lq4 setup and no matter what calculator I'm using it comes out weird? Or am I just reading it wrong ?
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Old Aug 24, 2017 | 02:33 PM
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The deck clearance number is wrong. Like my car the piston is out of the whole .007" so I would put that there and it calculated correct for me
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Old Aug 24, 2017 | 02:34 PM
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Try this one. It's pretty accurate...

https://www.uempistons.com/index.php...279b523a981cb8
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Old Aug 24, 2017 | 02:35 PM
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Old Aug 24, 2017 | 02:50 PM
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Originally Posted by 98CayenneT/A
The deck clearance number is wrong. Like my car the piston is out of the whole .007" so I would put that there and it calculated correct for me
What is it out of hole typically for an lq4?
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Old Aug 24, 2017 | 03:17 PM
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Originally Posted by blackfbird98
What is it out of hole typically for an lq4?
That I do not know. I know Ls1's are .005" - .009" and I measured .007" on my motor.

Until someone with more knowledge posts up I would have to imagine the Lq4 is in the same window of deck clearance.

The number you put in I'm assuming it's deck height and they are looking for clearance. (Piston out of the hole)

I think you would be fine putting .005" - .007" in for a rough idea.
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Old Aug 24, 2017 | 03:29 PM
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Ok I got it now it says 11:4
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Old Aug 25, 2017 | 04:02 PM
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I thought that LQ4's had dished pistons.
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Old Aug 25, 2017 | 04:33 PM
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Originally Posted by farmington
I thought that LQ4's had dished pistons.
That's been my understanding, with LQ9's having flat tops for more compression, plus a different cam for more power to boot.
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Old Aug 25, 2017 | 04:53 PM
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My lq4 had dished pistons but didn't know what they measured... doing a search came up a couple examples that were actually measured and one said 6.7 dish and the other was 7.0 dish.

Last edited by LLLosingit; Aug 25, 2017 at 07:40 PM.
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Old Aug 26, 2017 | 09:29 PM
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Originally Posted by blackfbird98
Trying to figure out what my compression would be for my lq4 setup and no matter what calculator I'm using it comes out weird? Or am I just reading it wrong ?
Your gaskets thickness is .510 That is over 1/2" Should be .051
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