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Hypereutectic piston to bore clearance??

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Old Nov 27, 2001 | 11:03 PM
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PerthZ28
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From: Perth Australia
Hypereutectic piston to bore clearance??
Engine builders - what clearance should I run with a set of Speed Pro hypers in a 4.02 inch bore? Does 0.001 to 0.0015 sound right? I am measuring 0.0025 right now but some stuff I have read says it should be tighter than that.
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Old Nov 28, 2001 | 06:16 PM
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ede's Avatar
ede
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i'd check with speed pro to see what they say, but guessing i'd look for more clearance since hyper pistons transfer a lot more combustion heat to the piston.

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Old Nov 28, 2001 | 08:56 PM
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Hyper pistons usually call for less clearance since they dont expand as much as other pistons do. You should contact speed-pro though to see what sort of spec they have, every manufacturer has a spec all their own.
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