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ChadS
12-29-2006 12:52:33
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Re: Lowering compression in reply to Mperfection, 12-26-2006 16:54:55
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Kerosine head,,, has a big chamber, its the lowest compression head there is. You can trim a little off them, best if the compression was lowered first before any grinding,,, polish up the chamber with fine grit. The surface is rough and that can be a restriction when a turbo in concerned. You then can add more boost pressure to make up the difference from the low compression head,, but its just more air and fuel going into it at that point,,,,, So,,, maybe more power??? Ive cut 8060 heads,, added the slanted area like the 450 head has,,,, thats pretty thick there,,, and can help ramp the air in, and out towards the valves instead of just up and down from the straight chamber sides. If you did that to a kerosine head,,, tuned up the turbo,, it might be stronger yet,,, Id say you would have to up the bosst pressure from going from the gas head to the kerosine head,,, its a 2 point drop in compression ratio from gas to kerosine heads,,,,, Just to make up te difference,,, but if you did,,, Would have to make more power and breathe a bit easier. Chad
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