i was planning on having my rods/pistons cryo treated. the problem was that the prelude type s pistons have a high heat resistant coating which one can see in plain view. what kind of coating is this?

i brought this to the attention of the cryo tempering services and they advised against the tempering unless i knew that the coating wouldn't be affected by the tempering. they mentioned that it MIGHT have adverse effects on the coating either right away or later on in life.

so any insight on this coating would really help me out. its a difference in a week or so waiting for the turn around if i do the tempering or not.

v

 

I believe it's a form of ceramic coating, which I would not recommend cryo-shocking.

 

I thought it was a moly coating. :dunno: In any case, I wouldn't chance it.

 

Molybdenum
I dunno about it being heat resistent, but it's an anti-friction coating.

 

molybdenum is a lubricant, no?

 

Are we talking about the piston skirt or the top of the pistons?

Moly is normally on the skirt, which makes sense, but if it's a piston top coating, it's almost certainly a ceramic-type material.

By the way, I wouldn't suggest cryo-treating ANY internal item that has a factory coating of any kind on it.

 

then i'll just send out the rods/bolts and maybe the girdle? they need a minimum order of $50 bucks so i need to get something else done...heh.

v

 

How about your tranny internals? Wouldn't cryo treated gears be a good thing?

 

yea you're right...i just pulled it apart.

v

 

H-series motors have aluminum composite sleeves so the pistons are coated with iron to keep from seizing up. Which is why you can't run forged aluminum pistons in stock H-series sleeves.