Lowering Compression Ratio

CVH and Zetec tuning, suspension and braking mods.
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Lowering Compression Ratio

Postby StreetDragster on Mon Nov 03, 2003 5:36 pm

Also, whilst i'm asking questions,

If i've got a compression ration of 10.5:1 presumably using a standard head gasket and i want to run around 20-22psi of boost, what ratio should i be aiming for and what is the best way of achieving this? I presume a thicker head gasket for a start, but any ideas on what thickness is avaliable and what i should be using?

Thanks

Matt

P.S If for a 2100cc Zetec E BTW
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Postby ianFRST on Mon Nov 03, 2003 8:16 pm

thats a crap way of doin it. ya can get a a compression plate made, like a head gasket but say 5mm thick metal of sumfin.... lowers the compression.

think ya should be looking 4 about 8:1 :-? :-?
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Postby snake on Mon Nov 03, 2003 9:15 pm

lol, with 20-22psi on standard pistons, urm nope, if your gettin forged pistons u just mod em to suit or get custom rods
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Postby Ian C70T5 on Tue Nov 04, 2003 9:21 am

Mines 7.4:1 comp ratio.. much better
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Postby StreetDragster on Tue Nov 04, 2003 10:19 am

Snake,

How do you mod the pistons to suit? Have the top of them skimmed off? Any idea how much would need to be removed to reduce the compression ration from 10.5:1 to say around 8:1

Thanks

Matt
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Postby PhilM on Tue Nov 11, 2003 3:53 am

If you want some low comp mahle forged pistons......you know where to come :Q
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