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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: 49

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Joined: 10th Dec 2006

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Ride: EAII Falcon S

Location: Brisbane
QLD, Australia

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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Ride: EF V8 Futura, 180sx

Location: Brisbane, Burpengary
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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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18" koya Strykers, AU engine with port and polish EB head, crow valve springs, standard cam, Large aftermarket RX7 turbo, T5 manual 3" intercooler piping, 600x300x100 intercooler core, MSII with innovate wideband O2 sensor and guage. BA F6 bodykit

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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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