BATMAN

I forgot what the specific brand of ceramic coating this is.

But it's the same one that Swain-tech.com uses.

Many top-fuel folks use this coating on their 8000HP cars.

So I figured why not?

This reduces heat soak by 35%~

http://www.illstreet.com/gallery/batman/CCR1

http://www.illstreet.com/gallery/batman/CCR2

I just had it installed in the engine along with the Rotary Aviation "kaboom-resistant" apex seals.

One thing that I noticed right off the bat is that my knock readings on stock boost and stock PFC maps dropped from 120 to 40 at WOT.

I'm still breaking in the engine and will get it tuned fairly soon with some results.

COsborne

sounds awesome!

Liquid Anarchy

iTrader: (2)

How much did it cost you?

BATMAN

$100 each

now

iTrader: (1)

clearance will not be a problem?

matt

BATMAN

nope.

It's running.

the thickness is half of a standard piece of paper.

Bucrx7

That's one hell of a decrease in knock. Price and company?

BATMAN

in ur area www.swain-tech.com

rxtasy3

iTrader: (2)

www.swaintech.com, without the hyphen. it says $150 ea for rotary rotor face coated.

BATMAN

Mine were $100 each rotor.

Fatman0203

Amazing!! w00t w00t for Batman!

Turblown

iTrader: (12)

Nice! I think I might try this!

Rx7carl

Very nice.

Doing any other coatings on this engine?

BATMAN

i was going to do the heat dissipation coating ont he block, but didn't have time.

Fatman0203

Please explain more.

BATMAN

Well, I don't have the percentages on how much heat is dissipated, but this coating is applied to the outside of the engine block or other metals to help draw out heat and radiate it.

No info on what this is made of.

i believe swin tech has this too.

1st to 3rd

These coatings serve great purpose in piston engines. 1) They do not want heat absorbed into the pistons. Remember they are aluminum and the cylinders are iron and the coefficient of thermo expansion is higher for aluminum. Nitrous and forced induction engines have to run wider ring gaps and, in more extreme cases, piston to wall clearances. This leads to more blow-by and more wear.
2) piston engines have no shortage of strange geometric shapes (piston domes, valve reliefs, combustion chamber geometry, etc.) which leads to hotspots. The high dollar engines use these coatings. The average joe accomplishes similar results (or at least attempts to) by polishing the pistons and chambers.
This is tried and true… but what is the purpose on a rotary engine? The rotors are iron and the housings aluminum, so that throws the thermo expansion out the window. Speaking of: By virtue of this wonder coating, the heat absorption of the huge chunk of iron with a constant stream of oil flowing through the middle we call a rotor is reduced. Where is this heat going?
It is true the entire combustion chamber of a rotary is oddly shaped and leads to uneven chamber temps, but where are these hotspots? I see no flycut domes for heat to hide.


Heat soak of what? And how is this 35% being measured?

Are those knock readings the peaks or the actual numbers under boost? If they are actual numbers under boost, then you have/had a tuning problem. If they are the peaks, then who cares? The peaks are usually just noise, not actual knock.

Again, I ask: Since the thermo absorption of the rotor is reduced and rotaries rely heavily on oil for cooling, where is this heat going?

Rotaries already have cooling flowing all around the parameter of the engine. What exactly is a radiant enhancing coating going to do on the outside of the engine in an already cramped engine compartment? Since radiation works both ways, what about absorbing radiant heat from the turbos?

BATMAN

The 35%~ was told to me by the shop that did the work.

They have various coatings from 20% - 35%.

The heat soak would be of the rotor face.

Heat radiates outward and most of that would escape via the exhaust, radiate towards the rotor housings.

All I know is that nothing else has changed underneath the hood, except the fact that the rotors were coated.

banzaitoyota

I am confused. If the Oil system of the 13B accomplishes ~30% of its cooling through the oil system, and the oil is transfering the heat of the rotor to the oil; why would you want to DECREASE the amount of cooling accomplished by the oil?

BATMAN

actually, by reducing the amount of heat in the rotors, this would take part of the cooling load on the oil cooling system.

So, in theory a single oil cooler with ceramic coated rotors may equal to a dual oil cooler system with no coating, or even better with dual coolers and ceramic coating.

banzaitoyota

Emperical evidence?

Oil temp in and out of engine?
Coolant Temp in and Out?
EGT of each exhaust?

t-von

iTrader: (8)

Don't forget, these ceramic coated rotors will help prevent carbon buildup on the rotor faces which also decreases the chance of detenation. Someone else on the forum had this done as well, I can't remember who.

banzaitoyota

I agree with the reduced carbon build-up theory, but that can be accomplished with polishing.


Basic heat transfer says the heat must go someplace, and the increased loa on the coolant system has to be accounted fro. Just slapping in a KOYO is not enough, IMHO

j9fd3s

iTrader: (3)

so the turbo can melt exhaust wheels? crack faster?

banzaitoyota

Look at Rotarygod's experience with the new sleeves. Melting standard impellars!