BlackWorksInc

So a friend of mine is into BMWs and was looking over some fourms to get an idea of how to rebuild his engine next semester and he came upon this:

http://www.tristatetuners.com/forum/...ad.php?t=54183

What caught my eye was the wonderful job the guy did with ceramic coating his piston heads.

That got me thinking, could the same be done to a Rotary? Say 12A or 13B/TII?

The product the author used is called Techline Cerakote CBC1.

Jeezus

iTrader: (4)

"They had a slight little "lip" to the finish since they were masked then sprayed. Using a yellow scotchguard pad, the lip is
easily removed with very little rubbing (it isn't bonded to metal so it moves from the object).
Here is a pic with slight lip"

That scares me.

EDIT: or maybe he ment that it bonds to metal and the lip is what is easily removed.

BlackWorksInc

Yeah that caught me a little off track, but I think he meant the lip because this guy's write-up is pretty thorough and well thought out. I doubt he was going to put this much time and effort only to have his engine go kablooey on him.

Though I suppose the real question is, what part of the housing/rotor would you use this on? and most importantly... Could we benefit from it?

I understand that this guy is using the cermaic coating for better heat dissapation, but would that same idea be a good one for our cars?

djessence

I think reading some of Yamamoto's books (available online) as well as any of the other rotary books would greatly benefit understanding these engines and the processes they go through to be made. I.e. production of housings and how the chrome layer is put in there etc.

They are probably available on the foxed.ca site and definitely kicking around the forum

Jeezus

iTrader: (4)

I would say it would be more beneficial to use it on the rotors. If you coat the housings, no telling if the apex seals will seal or just tear it up.

Also rotor:housing::piston:block

1badFB

iTrader: (1)

surprised it wasnt brought up yet:


www.jhbperformance.com

Jeezus

iTrader: (4)

$740 for a 12a. I can get new housings for less!

BlackWorksInc

I have a copy saved on my mac that I read a year ago. In any case I was more curious if it would be worth anything to us.

As for the Rotors, that does seem to make sense, and I would figure that would benifit best from the heat retention?

Also JHB was brought up in a previous thread I made, this was more of a; "it works for boingers but is it worthwhile for the triangle?"

1badFB

iTrader: (1)

Just wanted to show you guys that its out there!

If you saw the finished product, maybe youd think of them as more than just expensive...

Their ceramic metallic coating is flame sprayed, not your average coating.
The cermet-A was actually used on the lemans winning 787B.

People buying their products are going to be thinking about wear rate, friction losses, thermodynamics, and sealing capabilities of their engine.
Cermet is the answer when these become problems, when you want to get every last inch out of your powerplant.

Expensive stuff no doubt, but they do some really neat work!

Scalloped rotors
Compression ratio increasing
Housing repair

Cool ****.

RotorMotorDriver

iTrader: (1)

Some of the early housings were actually rings pressed into them if Im remembering correctly. Ive always thought it would be cool to replicate that, be it factual or not. Kind of like sleeving a piston cylinder.

~T.J.

BlackWorksInc

If I remember correctly, according to the book yamamoto wrote... The housings are actually prepared a special way and then a steel sleeve is inserted into the inside diameter of the housing and that is what is coated with the chrome...

But, my memory is fuzzy so i coudl be wrong.