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Boring 2.7 Mahle Alusil cylinders from 90mm to 92mm
Can you safely bore a 2.7 Mahle Alusil cylinders 90mm to 92mm? If so, do they have to be recoated?
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02-18-2020, 12:05 AM
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Yes you can, and yes, you do need to have them re plated. US Chrome offers this service. Better yet is to bore for steel sleeves, as the cylinder gets pretty thin in the spigot area. We bored, and pressed in 93mm sleeves for our 2.7 short stroke engine.
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1969 911TR lightweight, 1850 lb. 245 HP 2.7 short stroke 1973 1/2 911T S optioned sunroof coupe (in progress) 1998 993 Carrera Cabriolet PSS10 lowered E88 cup wheels 1999 996 Carrera Cabriolet Last edited by rgofast; 02-18-2020 at 07:30 AM.. |
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02-18-2020, 07:27 AM
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rgofast, what Brand 92mm pistons would you recommend? Also what compression?
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02-18-2020, 08:07 AM
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I have Cosworth. I’m at about 9.5 to 1. Get the pistons first, so who ever does the cylinders can fit them properly. Different brands of pistons sometimes recommend different clearances, etc. Check with Don Weaver at Engine Builders Supply. They can do your cylinders and supply the pistons. Follow his recommendations.
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1969 911TR lightweight, 1850 lb. 245 HP 2.7 short stroke 1973 1/2 911T S optioned sunroof coupe (in progress) 1998 993 Carrera Cabriolet PSS10 lowered E88 cup wheels 1999 996 Carrera Cabriolet |
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02-18-2020, 09:24 AM
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Join Date: Jul 2005
Location: Atlanta
Posts: 1,241
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I just nabbed a set of 92mm from Don at Engine builder supply, they have them done by Millenium cylinders. Really nice quality.
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No physical quantity completely explains its own existence |
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02-18-2020, 09:33 AM
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RGOFAST
