Polaris Nikasil Coating

More than likely the +3mm bore either broke through the original Nikasil coating or made it too thin. From this web site: Nickel Silicon Carbide (NSC) Cylinder Reconditioning and Plating Process for Porsche Nikasil Cylinders
"The NSC plating is electroplated onto the cylinder bore and then the bores are diamond honed with a plateau finish. After honing, the plating ends up being .004-.005" thick (per side)"

A +3mm bore is about .05906" per side of the cylinder.

If you plan to bore a cylinder you have to send the cylinder out for replating and honing in order to assure proper Nikasil coating thickness

We ordered a cylinder that was supposed to be bored and replated. I am thinking that the company may have done the process wrong causing it to chip.

Do you have any experience with Rev 6 and their parts? That is who we ordered the cylinder from.

Soooooooo Buster, did you ever try to contact nFLOW regarding a new cylinder ?

No, I went with the Rev 6 one because it was cheaper. Maybe I should have tried nFLOW.

I have no experience with rev 6, however I have seen other remarks on this forum that would tend to lead me away from them. Most of the time you get what you pay for, cheap isn't always cheap in the end.
nFlow has a good reputation here. I would not hesitate to do business with them.

I will have to look into them next time.

Buster Jones said:

Do you have any experience with Rev 6 and their parts? That is who we ordered the cylinder from.

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I do. They suck. And the cylinders are not new, unless its one that isnt a Polaris cylinder. Also there cases are refurbished. This company lies and sales shit. I had one of their pistons explode. Man, i tell ya, i got pictures and i spent alot of time dealing with these people. I ended up sending everything i brought from them back. There pistons are cheap Chinese crap. They are cast also. They dont have the cylinders coated like factory. They get their cylinders from a local company and half of them are knock offs. Any Polaris cylinder they send are refurbs and not coated. When it comes to major parts like crank, cylinder, pistons,bearings , you better use OEM. I can point out any lie they say about their parts,and i have proof.

Buster Jones said:

Hey, I have a 2013 RZR 900 with a +3mm Big Bore from Rev6. After less than 100 miles the engine started smoking. When I got it apart, I found that the nikasil coating had a large chunk taken out of it. I am curious what could have caused this. Is this a problem with the part or with assembly? I am also curious where I can get a new cylinder of this size. I can not find any of them from the higher end companies. The only ones I can find are from cheap Chinese companies. Are the cheap ones any good?

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Don't mess with rev6. Get in touch with me and I'll give you plenty of reasons. Youll have to get a new cylinder anyway,so go back with Polaris stuff.

Buster Jones said:

I will have to look into them next time.

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If you use rev6 stuff ,the next time is already here.

If you could find a quality cylinder that wasn't coated, then i would use that. Because on the coated cylinders, once you use them,its over, , you have to replace the cylinder every time you replace the rings. Or if you don't, then they start having blow by after a few hours of running.

We ordered a new one that is a new cast. Hopefully it holds up. I'm hoping the rest of the Rev 6 parts we installed hold up as well. I don't want to have to rebuild the whole engine again. I'll be sure to go with someone else next time.