Bore honing

[Chrisgti6]

Just after a quick bit of advice from any engine builders out there.

I'm just in the process of a full refresh of the engine in my R53 Mini cooper s. It's done about 110k and was leaking oil like a sieve so took the decision to take it off the road for a few months to give the whole car a refresh.

The engine is out and fully stripped, the plan is all new gaskets, bottom end bearings, new rings etc - basically a full refresh.

My current question is about the cylinder bores - there appears to be very little wear, I can still see the original honing marks.

Would I get away with just having it re honed and then using the original pistons with new std size rings - or would I be better getting it bored and going oversized with the pistons and rings etc?

I can get photos of the block if needed, it's in a box in the shed currently.

 

[gez 172]

If your honing it (which I would) then I’d be going up a size and doing it properly. Too much of a risk to put standard size rings in and risk it using oil. I’m sure you’d be able to get bigger ring sizes for standard pistons?

 

[JamesBryan]

If there's no damage to the cylinders, a light hone should be enough.

As long as all the clearances measure up within spec then stick with standard piston and ring size.

 

[Brigsy]

As above if the bore is not damaged and still in spec i would just glaze bust it with a flex hone and new rings.

 

[green]

I’ve been looking at the parts Lohan do for the mini if you have a nice budget.