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ddgonzal
Re: Compressoin ratio question
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Quote:
what compression ratio I am going to get with a untouched A12gx head going on to stock a14 block and pistons and stock head gasket?


8:1. remember, the A12GX head is lower compression than "regular" A12 head. It was the GX flattop pistons that made the A12GX high compression. The A14 has dished pistons so your compression will be lower. The big advantage of the A12GX head is it is a quench design, which is more efficient + the extra-large oval ports, which make more power at very high RPM.

Posted on: 2007/5/10 7:50
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B120dat
Re: Compressoin ratio question
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That high a compression!?... Is it because its a A12gx head going to A14 block... Whats the calculation on that. GX;s were only stock 10:1 with flat tops?

Posted on: 2007/5/10 6:56
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killer1200
Re: Compressoin ratio question
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Stock gx is 10:1 so you'll be get about 11.6:1.That not taking in to account pistons ect so maybe high 10s.

Posted on: 2007/5/10 4:36
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1200GXman
Re: Compressoin ratio question
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Hey B120dat

What is your plan? I am not totally up to date with the new project you are busy with. I tought you were going to install a L series motor?

Cheers

Posted on: 2007/5/10 0:32
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B120dat
Re: Compressoin ratio question
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I got a low compression A14 one ... But the GX head is port and flowed to 140hp, so is a must for abit more HP

Posted on: 2007/5/9 23:46
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PIGDOG
Re: Compressoin ratio question
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could just sell the gx head and get a lower compression one

Posted on: 2007/5/9 23:44
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B120dat
Re: Compressoin ratio question
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Any thoughts people..... need to whack it on this weekend dont wanna be boosting with too much compression!

Posted on: 2007/5/9 22:36
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B120dat
Re: Compressoin ratio question
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Good question, the flat top GX's were 10:1, not sure on what the non flat top GX's were. standard a12 is 9:1 im pretty sure. Im aiming for 9:1.

Posted on: 2007/5/8 23:19
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PIGDOG
Re: Compressoin ratio question
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so whats the standard comp ratio of an a12?
and what were the non flat top gx's?

Posted on: 2007/5/8 23:17
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vixen
Re: Compressoin ratio question
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With the set up you discribe and 29cc chambers comp will be 9;1 if chamber was 25.6cc it would be 9.95;1. Just performed this set up on a new motor.Hope this helps
GREG

Posted on: 2007/5/8 21:15
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