for the engine expert what's what
 

ok here is a fun question, as per the picture you can see 2 pistons, they are both 80mm ( yes for a 2.0) one is brand new and the other had to had the cylinder cut to remove, as you can see they have a different shape ( the dome), the valve pocket is different, they seem to have the same height , I know they will fit but why are they different
\http://forums.pelicanparts.com/uploa...1169561251.jpg http://forums.pelicanparts.com/uploa...1169561301.jpg

With the long skirt like that, and yet with the oil ring at the top, they are definitely T or E pistons. The different valve reliefs mean you probably have one of each.

My other guess is that you have one Mahle, one Kolbenschmidt. Weigh them, I bet they are different. What marks are on them, exactly?

piston
 

those are from 2 different set, on the right, one i just got ,,supposed to be mahls they have a small m punched on top and a metal reinforcement near the pin inside and on the left the old out of my 914-6 engine ( supposed to be a T)

I've got 69E, 68S and 906 single pistons on the shelf and the valve relief on yours are too small to be either a 911L or 911E.

It looks like you have 2 different T pistons - The one you removed from your engine look like a 69T piston (same as 914/6) The other? maybe a 68T?

If you are doing a rebuild, any interest in some 68S Pistons w/ or w/o cylinders?

Regards,
Andrew M

Agree with Andrew. The new piston looks like a '69T/914-6 piston. The other, I'm not sure, don't think I've seen it before. Not large enough valve reliefs (and no oil scraping ring at the bottom of the skirt) so it's not a '65-68 "normal"/911L piston. Definitely not 911E ('69), either.

i would have bben very interested in the set of 68s but I now 2 nos set the one shown here and a 2.2 é2.4 set so unless they are really cheap or you wanna trade i would have to put it on hold for now, at leat i now know that they will work just fine, just need rings now