|
|
|
|
| Author |
|
|
Registered
Join Date: Mar 2009
Location: a quiet beach town in Florida
Posts: 430
|
Mahle 90MM Pistons and Cylinders
Can anyone help me with what the compression of these would be. They were purchased for a short stroke project I was going to do. They fit on a 66MM crank.
Thanks, Bill  
|
||
10-27-2009, 10:33 PM
|
|
|
Registered
Join Date: Jan 2004
Location: CT
Posts: 11,567
|
Those look to be the standard 8.5 CR 2.7 RS pistons.
The part number forged beneath the dome should read 90P27
__________________
Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process |
||
|
10-28-2009, 02:50 AM
|
|
|
Registered
Join Date: Mar 2009
Location: a quiet beach town in Florida
Posts: 430
|
Thanks Tom - confirms what I was told by the guy I bought them from. He said they were 2.7 RS P &C's for MFI cars with a 70.4MM Ceank and with a 66MM crank will make a 2.5 with a 9.8:1 CR. I'll be posting these for sale on the appropriare thread this weekend.
Bill |
||
|
10-28-2009, 11:36 AM
|
|
|
3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
|
Sorry, he was wrong. Compression is LOWER using a 66mm crank. These will only give you a CR of 7.5:1. Unless this motor is a turbo, you'll need to return them or use a longer crank.
__________________
- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
||
|
10-28-2009, 12:20 PM
|
|
|
120 HP/Liter is all I ask
|
Below are pictures of the normal 8.5:1 RS piston on the right (w/carbon build up) and the nominal 10.4:1 Mahle racing 90 mm on left (new appearance). One can clearly see the difference in the dome crown in the middle picture.
__________________
"It all started when I began looking around and just could not find my dream car. So I decided to build it myself” - Ferry Porsche |
||
|
10-30-2009, 08:45 AM
|
|
|
Registered
Join Date: Feb 2001
Location: I be home in CA
Posts: 7,693
|
I have a question regarding the availability and compatibility of the 90mm high compression pistons without the cylinders. Are they available without cylinders? Also, if available would those pistons be compatible with the low compression cylinders?
Thanks
__________________
Dan |
||
|
11-06-2009, 08:56 AM
|
|
|
|
3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
|
Yes, the cylinders will work fine, regardless of compression. And you can get JEs without cylinders, but do not hink so with the Mahles.
__________________
- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
||
|
11-06-2009, 09:29 AM
|
|
|
120 HP/Liter is all I ask
|
Quote:
__________________
"It all started when I began looking around and just could not find my dream car. So I decided to build it myself” - Ferry Porsche |
||
|
11-06-2009, 12:13 PM
|
|
