JE Pistons for my 73 911S

[Wayne 962]

Someone recently sent me this question:

JE Pistons for my 73 911S

"Just finished reading your "HOW TO REBUILD AND MODIFY,,," and was wondering If JE Pistons are as light as the Mahle. I have heard they are not and may rattle when engine is cold. I own a 2.4 liter S i'm rebuilding and was wondering is the trade off worth putting JE Pistions to increase the compression. I have a Complete Mahle pistion and cylinder set with only 12,000 miles on,however they are 8.5:1. Also will the increase in compression increase engine temperature. I only use the car for hard street driving so I don't even know if I"ll feel the 10 HP.Also, any problem with the piston clearence going to high compression. Thanks for both of your GREAT books."

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I do recommend JE pistons. They are high quality replacements for the Mahle originals, and can also be 'dialed-in' to your exact specifications with respect to compression ratio. I do not see any quality differences when using JE versus Mahle, otherwise I would not recommend them.

I'm not sure what weight has to do with rattling? Perhaps you could elaborate?

An increase in compression may cause clearance conflicts, but these can be determined only during the final clearance checks that you perform on your engine.

-Wayne

[TimT]

I remember hearing things about JE pistons when they became a popular option for 911 rebuilds. People would say that you would hear a rattle or skirt knock until the engine reached operating temp. It doesnt happen.

JE does offer some amazing benefits compared to the Mahle,,, you can call JE (or one of there distributors and spec out your pistons), try that with Mahle......(thinking Mahle doesnt custom produce unless Porsche is your last name)

My cadre of friends has had good experience with JE pistons.... from 900 hp 3.4 turbos to my 200 hp 2.2 NA engine

With Mahle you get what the factory made, with JE you get the CR you specify...

Install, check your clearances, and have some fun

[dporsche74]

hi

I was wondering if anyone knew a shop i could get my set
of 2.0 cylinder bored out to the next size pistons with higher
compression, also will I need to send the heads out too, for the
new bored cylinders dia. or will it be fine?
thanks
dave

[snowman]

Ollies in SA california. Tell t hem what you want, they have allready done it and know what to do. Talk to them, ask for George.

I would ask them to finish hone it with a ball hone. I think this makes the rings seat better and quicker. They should know what this means. Again no matter what go by what they reccommend.