911 cast cylinder 90mm oversize to 92mm

[HKZ Bob]

Hello 911 Folks

thank you cnavarro for the great support. But has nobody allready has some field experience oversizing cast cylinders to 92 mm.

I ask a machine shop for oversizing my cylinders to 92 mm
+ honing them. 300 $

Then I could also get a set of 92 mm coated pistons with rings for $ 250.
The pistons are from a Moto Guzzi California, Daytona 1100 sport application,
air cooled 2 valve. RPM more than 6500 U/min





Here a picture from the bike.

[Henry Schmidt]

Boring 90 mm cylinders to 92 is generally a bad idea. The 90 mm cylinders have a CE ring (read head gasket) that leave very little cylinder wall thickness when bored to 92 mm.

The pistons you show are interesting but aren't the valve pockets in the wrong place?

[HKZ Bob]

Yes you are right, pockets are in wrong place. I will look forward for other pistons.

thank you