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Registered User
Join Date: Feb 2006
Posts: 9
Euro piston upgrade

I posted on Rennlist to ask what kind of horsepower putting Euro pistons into an otherwise stock '85 Carrera would do for horsepower.

A couple folks seemed extremely concerned that this would cause detonation problems if I encountered a "bad" tank of gas - meaning below the advertised octane. The further opined that this would basically destroy the egines top end.

Interestingly, this was done 40K ago in a rebuild of the engine in the car I am looking to buy.

Any knowlege on this?

Old 02-18-2006, 02:12 PM
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3.4 Bigger is better
88-diamondblue's Avatar
Join Date: Nov 2003
Location: South Dakota
Posts: 1,484

Welcome to the board. Take a look at this thread it might answer some of your questions. Are you sure they used 10.3:1 pistons in the rebuild? Make sure you get a PPI before you buy.10.3:1 pistons

04 996 40th Anniversary
88 911 Diamond Blue CE Carrera 3.4 HC3.4 member
2016 Acura RDX
Old 02-18-2006, 03:48 PM
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Registered User
Join Date: Feb 2006
Posts: 9
Thank you Michael! I learned quite a bit from that thread.

A PPI with leak down is being done Tuesday. The shop doing it is Motorsports in Lexington, KY. I even went over Peter Zimmerman's PPI list with them to make sure they will be doing what I want. I will also have them check the compression ratios.

The owner (2nd) has all receipts since the car was new, so I can find out exactly (I hope) about the rebuild.

I will also verify what octane fuels are available here in the US capital (my Volvo S80 would probably run on cheeseburgers if I ask it to).

Thanks again!
Old 02-18-2006, 05:15 PM
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Less brakes, more gas!
euro911sc's Avatar
Join Date: Jul 2005
Location: Stuart, FL
Posts: 3,489
The estimated cause of my ring disintigration was bad gas caused detonations. I'm running a Euro SC w/ 9.8:1 single plugs. See the link in my sig. for the thread.

I think if you merely swap pistons you wont see much problems. If the car has run 40k on the swap then I would think that was evidence that the engine is solid with the euro's in.

I believe Chris Bennet did this swap to his engine... prior to the first implosion after going big bore... hehehee perhaps he can chime in.


'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS
Old 02-18-2006, 09:53 PM
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