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James Renfroe James Renfroe is offline
Registered User
Join Date: Apr 2004
Location: Helena Alabama
Posts: 45
Mahle CIS Pistons

I would like to know if any of the Mahle 911 CIS pistons are forged or can I assume that they are all cast. Many 911S models came with CIS. Some Porsche literature state that the 911S models used forged pistons while the lower performance models, used cast.

I have looked at Alusil and Nikasil CIS pistons, they have features of cast pistons yet they came from S model 911s. Iím pretty certain that the RS, and RSR pistons are forged but I have never seen them up close or from the underside to see their forged features.

If there is a positive way to identify a 911 forged piston and a cast piston, I would love to know. Iíve read that the underside of a forged piston looks different, but how.

Please post any pistons pics for my own education!


Last edited by James Renfroe; 11-12-2004 at 02:48 PM..
Old 11-09-2004, 10:03 AM
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