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Registered User
Join Date: Jun 2004
Location: Ottawa Ont Canada
Posts: 180
I need education,,, engine that is

Ok i have the engine apart,, the oil was white,, not a good sign but all the parts are moving freely once the cylinders are off,, will do bottom end anyway,

, here is where i need education,, i am looking to keep the cost down,, so i am looking for a set of used piston and cylinder, my pistons are ok but will buy whatever makes sense,,

as i shop around for old 911 engine gear, i have seen that they have T/ E / S version,, what is the difference??, is it just the cam, what was the -6 original came with
????, i have seen piston set for sale but they the valve pocket seems deeper,, is it just my eyes or what

does the carb need to be modified??

9140431696 painted, with wheels and brake , with all elctrical working , engine in assembly soon to be driven
011850275 911S soft window targa next in the garage
2000 S4 stage 2
660R stroked
Old 02-27-2006, 12:06 PM
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up-fixing der car(ma)
YTNUKLR's Avatar
Join Date: Aug 2002
Location: Fremont, CA
Posts: 3,745
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There are 80mm (2.0L) and 84mm pistons/cyls (2.2; 2.4 gained displacement by stroke). T=Iron Cylinders, cast pistons, about 8.5:1 in a 2.2. E=Biral (Iron liner/Alu fins) cylinders, cast pistons, about 8.8:1 in a 2.2E. S=Biral cylinders, Forged pistons, 9.5:1 compression ratio in a 2.2L.

When Porsche made the 2.4L engine, they reduced the compression of each of these 2.2L sets by approx. 1 point, across the board (S=8.5:1, E=7.8:1, T=7.3:1).

Valve pockets are deeper as the compression goes higher (more metal on the pistons means more space needs to be cleared for the valves).

Porsche also changed the cams and head port sizes on each model, respectively. 911E (middle-priced) and 911S (top-of-the-line) have Mechanical Fuel Injection, 911T (base model) used carbs. Before 1970, with the 2.0L engines, Porsche also had different valve sizes between the 911E and the 911S.

If you have decent cylinders, a great option is to bore them out 1mm, to 85mm. Then you can order new JE pistons (I do this as well) which are forged and come in any compression ratio you want. Cheaper: get some used pistons and cylinders that you know are within specifications (machine shop).

Scott Kinder
kindersport @
Old 02-27-2006, 02:47 PM
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3 restos WIP = psycho
kenikh's Avatar
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,732
The best answers to these questions will come from Bruce Anderson's book: Porsche 911 Performance Handbook. If you don't own it or both of Wayn'es books, you need them. This portion of the forum kind of assumes you have read these. The answers are a bit long and Bruce does such a good job of answering them.

(edit) Scott did a good job of a high level summary.


- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 02-27-2006, 02:47 PM
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