[lv2race]

Hi,

I'm racing a 2.0 litre 911 in the SVRA with 81-mm Mahle pistons.

I took the engine out last week for a routine rebuild and noticed that on cylinders #1 and #2 the middle compression ring is broken. All of the other rings on the rest of the pistons look good. Does anyone have any idea what might have caused this? I would also be interested in any techniques people use to install the pistons into the cylinders. I don't think it happened there but I'm curious how other people do it.

On a separate note I've got an old set of 81-mm JE pistons that have never been used. They are probably at least 10-years old. What piston to cylinder clearance is recommended and can I use stock 80-mm Porsche cylinders bored out?

Thanks for all your help.

Rob hurley