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Bore size is 82.5mm. I believe the piston to bore clearance can depend on factors like the piston coating but if it was me I would consult with a professional engine builder since this is one of the most critical considerations that your rebuild will depend on. The difference may seem small but it could be a problem. I opted to buy the new pistons from Audi, 06H-107-065-DM, to avoid this issue so you could always go that route. The old pistons/rings are crap so I personally would not put them back in. You could keep the old pistons and re-ring them but I found it easier to just replace the entire piston which comes ringed.
I just checked my new pistons from Audi and they are 82.455mm:
Last edited by silver_tt; Oct 27, 2024 at 05:24 AM.
Bore size is 82.5mm. I believe the piston to bore clearance can depend on factors like the piston coating but if it was me I would consult with a professional engine builder since this is one of the most critical considerations that your rebuild will depend on. The difference may seem small but it could be a problem. I opted to buy the new pistons from Audi, 06H-107-065-DM, to avoid this issue so you could always go that route. The old pistons/rings are crap so I personally would not put them back in. You could keep the old pistons and re-ring them but I found it easier to just replace the entire piston which comes ringed.
I just checked my new pistons from Audi and they are 82.455mm:
Yes that compression ring is different, which would make sense. Did you buy your new pistons from Audi or are they aftermarket? I didn't get a picture from that side of my piston to see the gap in the rings before I installed them. It also makes a lot of sense that they went to a slightly bigger piston so there's less blow-by in the first place. Great observations....
Yes that compression ring is different, which would make sense. Did you buy your new pistons from Audi or are they aftermarket? I didn't get a picture from that side of my piston to see the gap in the rings before I installed them. It also makes a lot of sense that they went to a slightly bigger piston so there's less blow-by in the first place. Great observations....
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AU: NEED some help with new pistons
