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-   -   911 piston orientation (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1043004-911-piston-orientation.html)

VinceDiG 10-19-2019 12:49 PM
911 piston orientation
 
I’m disassembling my 1974 911 2.7 for a rebuild, and documenting as I go. I believe the #1 piston was installed upside down when it was rebuilt many years ago. All the pistons have the hump pointing towards the fly wheel except #1. Please take a look at the picture and let me know if my suspicion is correct. I want to make sure I get it right when I reassemble the engine. Sorry the pic is upside down.

http://forums.pelicanparts.com/uploa...1571517590.jpg

Dpmulvan 10-19-2019 01:47 PM
Yes all should be the same. You should pick up Wayne's book on rebuilding and modifying 911 engines.

Flat6pac 10-19-2019 03:34 PM
You’re right on #1 cylinder. the concave area is by the spark plug when you build 2.7 to 3.2
Bruce

VinceDiG 10-19-2019 04:42 PM
Thanks for confirming.

boyt911sc 10-19-2019 06:15 PM
How about the other side?
 
Do you a picture of cylinders 4-5-6? When your are looking or facing at these cylinders, the hump should be on the left side of the CIS pistons.

Tony

VinceDiG 10-19-2019 07:31 PM
4 5 6 side

http://forums.pelicanparts.com/uploa...1571542273.jpg


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