My F54 cylinder holes measure 3.4" after a good cross hatch honing. I've got some Hasting rings, 1.5 1st 2.0 2nd then the oil ring 4.0, for the ZX pistons. Does that -030 at the end of the part number mean thirty thousandths larger? Would 3.416" be too tight? They're cast iron I believe.

Thanks for any help/ideas/opinions,

Cliff

Please do not guess, mic your cylinder bore. If you have just honed an existing 3.4 bore, assuming it was bored properly the first time by a machine shop using the zx pistons, it should have had the p2w clearance already set in the neighborhood of 3.416 (ish). Give or take a few thousandths given your new quick hone. Also mic your piston, you may find that it too may measure just a bit under 3.4/3.416. Now you want to check clearance in 2 ways, one slide your piston naked ( no rings ), gracefully up and down the bores to make sure there's no binding anywhere. Next try the rings. Insert your rings into your cylinder, I use the piston to make sure they travel down evenly. Go about half way down, that's about the distance it'll travel. Be sure to use a lil' bit of oil/lube so you don't score anything. If they butt against one another or intersect, too tight. If not get a ring file. Get a manual, and begin filing to get your ideal ring end gap.

but before you do all that you can easily tell if they fit or not by simply mocking them up next to the cylinder bore. Just don't squeeze them too tight trying to make them fit when they don't, they will snap.

Good Luck!

Joel

Edited August 8, 201410 yr by Nite_Grind

I wasn't in my right mind when I posted that last night. I was wondering if .030 is a common cylinder over size after a machine shop honing. I believe that is the reason for the part number to be 6124 030. I definitely will do a dry fitting before installing these rings that came with the block assembly.

I see. Well .30 over sounds to be what you need. It's neither common nor uncommon. More power for the penny IMO, bigger is better ideally. But we can only still go so far before issues arise.

I talked to a machinist. He says the cylinders were cleaned up and that widened them by .030". That's why it has the .030 over sized rings for the stock pistons. He's an old friend of my Dad's and laughed at me! He said to clean the hell out of everything and bring it to him for measuring to make sure it's all going to work. I can get bent out of shape when I don't understand things, that's why I'm still single and half nuts.

Sounds like your good to go.

Sounds like your good to go.

You mean the part about being still single and half nuts?

single and half nuts?

I tried sneaking up behind a horse, of course.

You mean the part about being still single and half nuts?

both perhaps.