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#3
Re: What would be the compression ratio of an a12 with a10 pistons and h75 head?
Matto1kUte
Posted on: 2022/1/11 17:02
Thankyou again :)
 
#2
Re: What would be the compression ratio of an a12 with a10 pistons and h75 head?
ddgonzal
Posted on: 2022/1/9 22:40
To achieve 10:1 - the stock A12 GX compression ratio - three things are necessary:
1. Flat-top pistons 2. extra-thin head gasket 0.8mm (Nissan 11044-H2301 GX gasket) 3. Combustion chambers of 29.1cc size (GX) H89 can be blueprinted/skimmed to 29cc H75: there are two H75 casting heads. One that is machined with open chamber (31cc). With standard 1.6mm head gasket will result in 8.8:1 compression ratio With open chambers there is more run-on and detonation - even at lower compression ratios (ie. 8:5:1). More so at high CR. Reduce the spark timing to compensate. H89 head will not need this as it is closed chamber Attach file:  11044-H2301 (with O-ring) Top.jpg (51.45 KB) 11044-H2301 Bottom.jpg (52.37 KB) 11044-H2301 Head Gasket.jpg (29.51 KB)
#1
What would be the compression ratio of an a12 with a10 pistons and h75 head?
Matto1kUte
Posted on: 2022/1/9 13:35
Hey all, just wondering what the compression ratio would be of an a12 with a10 flat top pistons and a stock h75 head? Trying to get around the 9.5-10:1 compression ratio. Would there be any valve clearance issues? Thanks
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