AAN oversize pistons

[MuK1989]

Hello,

I am rebuilding an Urs6 AAN engine for my B3 coupe quattro.

The cilinders need to be rebored, so i want oversize pistons. I was looking for OEM pistons, because they are good enough for my setup ( SMS k26 hybride turbo + SMS ECU ).

What are your thoughts about using OEM pistons? And can anyone supply the numbers of the pistons?

Gr
Mark

[rxl]

i think the stock ones are expensive... you will probably save some Money going aftermarket..

[MuK1989]

I cant find the prices for the OEM oversize pistons, so i cant tell if they are expensive.

And what would you recommand for aftermarket pistons? I heard bad stories about JE-pistons, and i dont know much about other brands.

So wich pistons are good, and what are the prices,?

Thanks in advance

Mark

[rxl]

talk to fcp-enginering he sells them and i think he will give you a good qoute.
got some Pistons for my stroker build and the servis and the Quality is realy great.

[diesel des]

Or try wossner pistons. They run tighter clearances than other aftermarket pistons so are quiet and use no oil.

I like them in my stroker build...

Sent from my SM-G900F using Tapatalk

[rxl]

fcp sells wossner.

[MuK1989]

I got a private message from fcp engineering with some things to think about, thanks

[rxl]

Well don't worry he does sell quality products

[MuK1989]

I am not worried about the quality of the pistons, but with the wossner you have a compression drop from 9,3:1 to 8,0:1. I am worried about that.

After some research is found Mahle pistons 81,48mm with this number: 034 92 02, is there enyone who can confirm these are the oversize remplacerend pistons?

[Quattronaut]

a compression drop from 9,3:1 to 8,0:1. I am worried about that.

That is nothing to worry about, that is a very strong reason to go for 3bar and 900hp

[Error404]

I am not worried about the quality of the pistons, but with the wossner you have a compression drop from 9,3:1 to 8,0:1. I am worried about that.

After some research is found Mahle pistons 81,48mm with this number: 034 92 02, is there enyone who can confirm these are the oversize remplacerend pistons?

Wossners are not 8.0:1
I calculated mine at 8.5:1 - perfect

Another option is you can use your original pistons if you get the block sleeved

[Rusty]

FCP quote their pistons are 8.5:1, so I went with them in 81.5mm. They looked like pistons and all weighed the same on my digital scales, which is a good start but other than that, I can't say any more from my cursory glance. Service from FCP has been very good. Try Danny "DNA-S2" for parts too

[MuK1989]

That is nothing to worry about, that is a very strong reason to go for 3bar and 900hp

Haha, dont think the sms k26 hybride can produce that kind of numbers

[_ShurikeN]

Mahle pistons 81,48mm with this number: 034 92 02, is there enyone who can confirm these are the oversize remplacerend pistons?

A screenshot in Russian, but should be clear in common.

[MuK1989]

Yes, i found the same info. 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?