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Registered
Join Date: Feb 2005
Location: California
Posts: 724
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piston to cylinder clearance
I have a set of 911S 80.5mm Mahle pistons to go with my
80mm biral cylinders (to be resized.) What clearance should I go for. Tech specs for 67S show minimum clearance at 0.45mm but 68S has 0.35mm. andy |
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12-21-2009, 04:09 PM
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Join Date: May 2003
Posts: 3,346
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Those numbers are too big by about 10 times.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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12-22-2009, 01:14 PM
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Location: California
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Andy, you are right.
But the question still stands, should I be going for 0.045mm clearance or 0.035mm clearance or more or less. I can size them anywhere I want given that the pistons are about 0.5mm larger than the bore at this point. andy |
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12-22-2009, 01:49 PM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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I like .40mm or .0015 for Mahle forged pistons.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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12-22-2009, 02:40 PM
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I believe the wear limit is .004 inches. Personally I like to set them to .002 inches if I have the choice. I don't have the experience of Steve however.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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12-23-2009, 02:17 PM
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| cylinder resizing |
