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Registered
Join Date: May 2005
Location: Woodstock, GA
Posts: 926
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JE pistons in original cylanders?
Can this be done, or do you need to get a differenct cylander to accept the JE pistons? Reason for asking: the cost differential between JE and Mahle.
Thanks Scott |
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10-27-2009, 02:00 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Yes - JE pistons and Biral cylinders are fine, although you should tell your supplier what kind of cylinder you will run so they can optimize the piston clearances. Nickies are the best cylinder for JEs since the alloys are a perfect match and exspand identically.
__________________
- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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10-27-2009, 05:17 PM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Search here for the terms "jugs and slugs" for everything I know about this subject
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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10-27-2009, 05:39 PM
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Wer bremst verliert
Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,767
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I dont have a lot of knowledge on this, but 2 engine builds I did with these. 11:1 JE pistons in 3.0L cylinders naturally aspirated and 7:1 JE pistons in perfectbore 3.2 cylinders seeing 10psi supercharged 350hp.
Both work well.
__________________
2007 911 Turbo - Not a toy 1985 911 Cab - Wife's toy 1982 911 3.2 Indiash Rot Track Supercharged track toy 1978 911 3.0 Lichtbau toy "Gretchen" 1971 911 Targa S backroad toy |
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10-28-2009, 01:08 AM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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I have heard that Porsche Mahle pistons wristpin is slightly offset while the JE piston wristpin is centered and not offset.
It may be hearsay, but I've heard this offset makes a difference in piston skirt wear or scuffing especially in a horizontally opposed boxer engines because of the effects of gravity, and downward thrust and connecting rod angle during the power stroke. This is a different situation than the comparison of expansion rates between JE forged alloy pistons and different cylinders in an air cooled motor. |
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10-28-2009, 08:57 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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__________________
'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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10-28-2009, 09:27 AM
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