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boofis
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Location:
MELBOURNE
Registered:
December 2004
icon7.gif  More "K" queries Tue, 19 April 2005 21:13 Go to next message
Hey
Just wondering if this is true. If you put domed top pistons on a 4k block and then put a 5k head would that lower compression? Trying to figure out ways to lower compression on 4k, any ideas welcome!!! Have a good one!
Thanks
Troy
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Super Jamie
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On Probation

Location:
North East NSW
Registered:
December 2002
 
Re: More "K" queries Wed, 20 April 2005 03:00 Go to previous messageGo to next message
no. with flattops, you get something like 15:1 with 5k head. once you spend 2 grand having custom dome top pistons made, you'd end up with a motor which wouldn't be able to open the valves, and the little K motor starter probably wouldn't even be able to turn against the compression

there exist dished pistons for 4k, in japanese 4k-e and 4k-u bottom ends. these with a standard flattop head gives you about 7.5:1

you can also port a head out about one compression point if you know what you're doing
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boofis
Regular


Location:
MELBOURNE
Registered:
December 2004
Re: More "K" queries Wed, 20 April 2005 05:49 Go to previous message
Thanks man! Afte rsurveying my options I think I'll just go with an engine swap and supercharge tha after all!
THanks
Troy
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