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Senior Member
Join Date: Sep 2000
Location: planet earth
Posts: 2,253
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how does a 3.0 piston weigh
what is the weight range of 78 911sc 3.0 Mahle piston?
[This message has been edited by osidak (edited 08-10-2001).] |
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08-10-2001, 02:50 PM
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Moderator
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Spec book only says max difference in a set is 6 g.
------------------ Bill Verburg My Home Page  My Pelican Gallery page My Porsche Owners Gallery Page |
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08-10-2001, 02:59 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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osidak,
Since you don't really know the year of your replacement piston ... it might weigh anything between 636 g and 676 g. Do you know the weight class markings ( --, -, +, ++} on all six of your 'good' pistons? ------------------ Warren Hall 1973 911S Targa 1992 Dodge Dakota 5.2 4X4 parts hauler [This message has been edited by Early_S_Man (edited 08-10-2001).] |
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08-10-2001, 03:20 PM
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Registered
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,736
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Osidak, I would take your cracked piston and the new one to a machine shop and get them to compare the weights. Warren is it ok for Osidak to file metal from the moulded inside of the piston to get the weights within a gram of eachother ?
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08-10-2001, 03:34 PM
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Senior Member
Join Date: Jan 2000
Location: Reno, NV
Posts: 3,694
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When I had my pistons balanced, I was really suprised at how much material the machinist had to remove from the undersides. On the mahles, under the wrist pin on the square side is where he removed quite a bit of material.
On a couple he said he almost had to lightly shave the thick part of the dome (under side) to get them all within a gram of each other. He took the lightest piston, pin, circlip combo and used it for the average weight. JDUB has them now...maybe he can post pics! |
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08-10-2001, 03:41 PM
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1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
