txhokie4life

I've got an rsr replica engine that I got with the car.

Previous owner said he pulled if off the track with piston slap issues.
No idea if this was at hot or cold. PO was not mechanically inclined.

I tore down the engine and noted the following with a machinist doing the measurements.

Mahle cylinder sleeves, mic out to
~102mm
Ross pistons with 5-6. 1/1000 clearance.

The cylinder liners are nikisil and show no obvious signs of wear.

The pistons show scuffing on lower skirt, some near ring landings.

This is a race only engine.

The machinist doing the measuring was concerned that the sleeves may have been 3.6 sleeves (100mm) and bored out to 102mm
(I was wondering if Mahle had 102's???)

We are wondering how thick the cylinder walls should measure?
According to him they are thin.
But he doesn't have an air-cooled back ground

Anyone have specs for 102mm Mahle?

We're wondering that maybe the cylinder is too thin and heating up and expanding too much and the clearance is growing too large allowing the piston to wobble around. Just thinking out loud....

If you can't tell, I'm not a mechanic, learning, but I don't know the lingo, so I apologize if I used the wrong terms

We think the pistons need to be replaced, but not sure on the cylinder liners.

Don't want to spend money needlessly.

This will be a de/track car
Probably never a true racer.

Thanks

Mike

Thx for help and pointers.