Piston ID

[1972_911T]

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]

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.



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

Walt

[haycait911]

just went thru this....
are these euro pistons?

[1972_911T]

Originally Posted by haycait911

just went thru this....
are these euro pistons?

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]

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]

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.







Steve

[tom1394racing]

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]

Mine are deff 8.5 then.

Thanks Steve

[euro911sc]

heheh... took me a while to find it and Tom beat me to it with his own knowledge

__________________________________________________ ____________________________

Originally Posted by tom1394racing

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:
The shop switched pistons on me?

Enjoy!

-Michael

[1972_911T]

Originally Posted by haycait911

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