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Registered
Join Date: Mar 2010
Location: Portland, OR
Posts: 255
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Help: Mahle 84 MM Cylinder Condition
I purchased a set of 6, Mahle 84 ZD 3 cylinders for my 2.4 rebuild. They don't look good to me but I'm not an expert. The pictures below are of the worst cylinder but they are all relatively the same condition. I planned to have them honed/other but I'm concerned they are far past that.
Opinions please. Thanks, Greg     
Last edited by grotvik; 03-16-2018 at 12:03 PM.. |
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03-15-2018, 06:41 AM
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Ingenieur
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Those are the Biral cylinders, with the iron liner and aluminum fins. If those black smudges can be felt with a fingernail, they are pitted from rust, probably too deep to clean up by honing.
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03-15-2018, 10:54 AM
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Registered
Join Date: Mar 2010
Location: Portland, OR
Posts: 255
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Yes, the smudges can be felt with a fingernail.
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03-15-2018, 11:26 AM
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Registered
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,418
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Typically we bore them out 1mm and get pistons made to suit the build.
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Aaron.  F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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03-15-2018, 11:28 AM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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I second what Burn Bros said.
85mm is the max you can bore the Birals. A set of custom 85mm pistons will run about $1000. Just tell that what cams, and CR you want. CP pistons should still have the needed info from when I had my last set made.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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03-20-2018, 10:14 AM
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