SilvCF2k

Will my oem pistons still work on the FRM sleaves if I have the piston skirts ceramic coated?

zeroptzero

Good question, as I've found it odd that this engine doesn't have moly coated pistons, most of Honda's higher revving motors did. There must be a reason for this. Sorry I don't have an answer though.

SilvCF2k

Anyone?

chris_barry

The F22C engine I pulled down last weekend had a black coating on the skirts that looked very similar to moly coatings.

Why do you want to coat the skirts? Are you trying to make up a clearance problem?

SilvCF2k

3 out of my 4 pistons are in spec. I bought a new piston to replace the one that was out of spec. I have 3 pistons that do not weigh the same as the new one. I thought have them coated would help. The skirts are a little worn on those three as well, but as I already stated, they still are in spec.

chris_barry

If its balance you are chasing then equalize them by carefully removing material from the underside. Start smoothing out any lumps or lugs, then remove a slither material from the back of the skirts. Make sure you work through to a fine cartridge roll so you dont leave any sharp edges or rough surfaces.

If your piston clearances are on the large end of the specs that is actually good as there will be much less chance of picking a skirt up on the bore.

The FRM material can be a little tricky in terms of matching materials. I wouldnt want to start experimenting just to make up a few tenths of a thou.

SilvCF2k

The pistons are not on the large end. I am worried about the three pistons have to much clearence. I know they are in the specs but I would feel more comfortable not seeing all that wear on the skirts. Anyone know if ceramic coating on the skirts is a bad idea? Or has anyone done this?

SilvCF2k

If nobody can answer that then would removing the extra weight from the new piston to match the other three be a good idea?

Saki GT

If it bothers you so much, I'd buy three more new pistons and go from there. Otherwise, I wouldn't add mass to any of the pistons with coatings - they worked fine before, so trim down the new piston and go from there.