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Lower compression using head shims\spacers 

 

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 Post subject: Lower compression using head shims\spacers
Posted: Thu Jan 31, 2008 7:18 pm 
Getting Side Ways
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Age: 56

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Joined: 10th Dec 2006

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Location: Brisbane
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has anyone had experience using head shims\spacers to lower compression? (eg) using a 2.0mm copper shim on the i6 rather than putting in lower compression pistons. are they reliable under high loads?

search only came up with cam shims\wheel spacers. :)

 

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Posted: Sat Feb 02, 2008 7:39 am 
Getting Side Ways
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i don't know about head shims but a lot of guys just put 2 head gaskets under the head to lower compression

 

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Posted: Sat Feb 02, 2008 10:45 pm 
Getting Side Ways
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Alot of old turbo conversions used to used a steel decompression plate.

Problem with these is that you loose your squesh band (hence chamber turbulance) often causing pre-ignition at lower boost levels compared to using dish pistons.

 

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