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-   -   Piston ID (http://forums.pelicanparts.com/911-engine-rebuilding-forum/373683-piston-id.html)

1972_911T 10-23-2007 02:49 PM
Piston ID
 
How can you ID 9.8:1 SC pistons? Does anyone have any pics of them? Do they look different form the other CR pistons?

Steve

Walt Fricke 10-23-2007 08:00 PM
Yes, but not easily, as they look about the same.

Here is a picture someone posted on this very site end of August comparing Euro and US 3.2 pistons. I think the SC differences are similarly hard to spot.

http://forums.pelicanparts.com/uploa...1193198309.jpg

Maybe someone has photos of the SCs. All I have at hand are some 9.3 Alusils.

Walt

haycait911 10-23-2007 08:43 PM
just went thru this....
http://forums.pelicanparts.com/porsche-911-technical-forum/371832-these-euro-pistons.html?highlight=euro

1972_911T 10-23-2007 10:26 PM
Quote:
Originally Posted by haycait911 (Post 3549032)
From looking at the pics posted in your thread the one I have are not either, must be the 8.6 ones, strange thing is they came out of a 930-10 ROW 83. :(

Steve

haycait911 10-23-2007 10:38 PM
the ones still in the engine in the pics are in an '82 930/10. I have 3 good 9.8 pistons if you're looking. the other three have broken ring lands. 9.8:1 compression plus lousy gas equals detonation. hmm, go figure. I'll be putting in 8.5 pistons. it's a daily driver. let's see a pic of what you've got? Don.

1972_911T 10-24-2007 01:07 AM
Here you go!

Nice set of what I was hopeing was going to be 9.8's but seems there the early Mahle low comp ones.

http://forums.pelicanparts.com/uploa...1193216527.jpg

http://forums.pelicanparts.com/uploa...1193216605.jpg

http://forums.pelicanparts.com/uploa...1193216704.jpg

Steve

tom1394racing 10-24-2007 04:41 AM
The best way to confirm the CR of the OEM Mahle pistons is to look for the Mahle P/N designation inside the piston.

93L7 = USA 8.5 CR
95L67 = ROW 9.3 CR
95L70 = Euro 9.8 CR

1972_911T 10-24-2007 05:12 AM
Mine are deff 8.5 then.

Thanks Steve

euro911sc 10-24-2007 05:22 AM
heheh... took me a while to find it and Tom beat me to it with his own knowledge :)

__________________________________________________ ____________________________

Quote:
Originally Posted by tom1394racing (Post 3495372)
Check the piston ref # on the inside of the piston.

The SC numbers are:

93L7 - 8.5 CR
95L67 - 9.3 CR
95L70 - 9.8 CR

Don't mix them...CR will be different and the piston weight will not match.
From:
http://forums.pelicanparts.com/911-engine-rebuilding-forum/368575-shop-switched-pistons-me.html?highlight=piston

Enjoy!

-Michael

1972_911T 10-24-2007 06:30 AM
Quote:
Originally Posted by haycait911 (Post 3549118)
I have 3 good 9.8 pistons if you're looking. Don.
If you still have the damaged ones I have a good use for them if you wouldnt mind parting with one or two? For shipping plus something for your time to post them?

Steve


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