Hertsdriver said:RXBoxster said:they wouldn't have overbored it... as oversized pistons arn't available, and aluminium cylinders either need re-coating in nikasil, or steel liners fitting.
Apologies you are correct, the invoice states:
"Carry out repair to bare crankcase
Replace cylinder 4/5/6 and machine cylinder to piston
Check roundness of cylinders 1/2/3 and install top brace
check existing pistons and match to new"
3 new OEM pistons are listed in the bill.
I believe the guy has part ex'd the car against an M5 so no doubt it will make its way back into the system....
OK I'll bite. I read that as Cylinders 4,5,6 all replaced with new liners and 3 new pistons fitted. Pretty standard for Hartech. Cylinders 1,2,3, checked for signs of ovaling and then retaining rings fitted to strengthen them. All of which sounds fine... Now the real question is who did the borescope and do you have any pictures? Nikasil liners will show running in marks on all of them as the piston rings bed in, (the marks are from the rings, not scoring to the bore). The original cylinders in bank 1 may show some marks, but again it is hard to tell if these are actually problematic scores. Did the car have any other borescore symptoms? (Tapping noise from piston slap, high oil consumption/blue smoke on hard acceleration, sooty exhaust tips). Not saying you were wrong to walk away from this car, but I find it very hard to believe all 6 cylinders are now scored?????