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CP 107 pistons

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Old Jan 5, 2011 | 09:21 PM
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evostroker's Avatar
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Default CP 107 pistons

My CP 107 pistons showed up in the mail today. Just wondering what you guys recommend for clearance. The spec sheet dosn't have a range..just says .002...seems a little tight for a forged piston..any Ideas???
 
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Old Jan 5, 2011 | 09:42 PM
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with CPs in automotive applications i go 3.5 thou.

it really boils down to the alloy the parts are made of.

ive seen old school guys set up cars today using CP stuff, and they go 6.5 thou. like in the old days with old TRW and speed pro stuff, and the motors knock like crazy and the rings never seal.

Call CP directly if you have questions. but i think they are meant to be tight.

the last set i had done, my indy made it a point to tell me that the tolerances were tight and to be mindful of this during break-in.
 
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Old Jan 5, 2011 | 10:38 PM
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We go .0025-.003
 
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Old Jan 5, 2011 | 11:33 PM
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.003" for sure. Piston should be 3.935, cyl 3.938
 

Last edited by dbr1990; Jan 5, 2011 at 11:35 PM.
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Old Jan 6, 2011 | 06:02 AM
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On our proprietary Wiseco 98"s, and 107"ers, we set 'em at .0025-.0030", but as Mentor said, it depends on the the contents of the forging.
Scott
 
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