AAN oversize pistons

[V6quattro]

Maybe you are interested in this:

http://www.s2forum.com/forum/showthread.php?t=75644

I think i will take a 82.5mm set

[MuK1989]

Hmm interesting, am i correct if i say the original wrist pin size is 20mm?

What would the CR be with 81.5 mm pistons?

[MuK1989]

Just found this in an old topic

[_ShurikeN]

I also found 1 picture with the pistons and on top of the pistons it says 81.48. In the info sheet it says cilinder bore 81.51mm. That should mean a clearance of 0.03mm. Is this correct?

Yes, It's clearance for OEM pistons. Clearance for forged pistons like Woessner may be different.

[V6quattro]

Hmm interesting, am i correct if i say the original wrist pin size is 20mm?

What would the CR be with 81.5 mm pistons?

Yes 20mm is the original size. CR at 81.5 is around 8.5:1

I'm now running JE pistons made from 2618 alloy. But the pistons make a lot off noise and all-ready have wear marks on the skirt.

http://www.s2forum.com/forum/showthread.php?t=73246&highlight=je+noise

I will run the engine this year but next winter i will take the engine apart to see if the skirt damage is become worse. I then like to try the 4032 or Mahle 142 alloy pistons. I think thy are more suitable on the street.

[Error404]

Yup, I went for the Wossner due to tighter clearances - you want this on a road car I think. IIRC Wossner clearance is 0.03

[diesel des]

Yep I'm running something like 0.03 clearance on the wossner pistons and have zero piston slap and little to no oil use.

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[JariP]

It says 0.07 clearance on my box of wossners.

[diesel des]

Fairly sure I'm running tighter than their recommend value.

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[MuK1989]

What kind of setups are you running with the wossners? And how much hp?

[diesel des]

http://www.s2forum.com/forum/showthread.php?t=73108

[FCP-ENGINEERING]

Woessner works well 4years in my 4cylinder 600hp 2,0 opel engine with out problem, so 750-800 in 5 cylinder with out problem.

[Error404]

It says 0.07 clearance on my box of wossners.

You are right: I couldn't remember so I checked.
I am running their recommended clearance. No piston slap or oil burn

[MuK1989]

Today I got a quote from my local garage for the oversize Mahle pistons, it was €200 ex VAT each. So maby Mahle is getting interesting after all

[Error404]

Still 2x the price of Wossner