Take note : You guys are forgetting that the heat
transfer from the head to the manifold is involved
too & that takes up a fair bit of percentage.

 

on ambient air, yes it was the same - within 3°F. I bought spare parts, had them coated ahead of time so that I could complete my refresh, then sell the spares that came off the engine. Temp was 63°, drive time of the car was 20 minutes for some spirited runs, then home, open the hood, engine runnning, take readings: stock intake, exhaust, and turbo down pipe. Then did the same thing after the refresh and took readings, temp was 60°.

 

My understading is ceramic coating acts as a barrier on both ends. Does not let heat out, or heat in.

So, in the case of the intake, that ceramic barrier keeps heat OUT of the intake. And heat is not generated IN the intake.

And Ski's numbers show some benifits. But of course I was aware that the benifits are FAR more for the exhaust then the intake.

 

So, the ambient, from what I have read, is hotter then the air inside the intake and thus, the coating would keep that hotter ambient air out. Of course, it is not a BIG difference like in the case of the exhaust.

But is does look great!!

 

That's what I would have thought; ambient above a hot turbo would be higher temp than even the compressed charge coming out of the IC.

How long is the charge in the intake anyway? Well under a second at high boost conditions I'd imagine, therefore making very little difference to the temp of the charge regardless. That's the same logic I apply in thinking the thermal barrier intake gaskets you see around are pretty pointless. Then again Ski's figures suggest it does make a slight difference.

 

Here's some quick math..
If the engine consumes 400 cfm, that's 11300 litres/min folks. About 183 litres/sec. The intake is around 3.5-4 litres?
I'd be more concered about the intercooler than debating on different barriers on the intake.

 

I just emailed the shop owner and he said yes the exhaust parts are coated inside and out. The intake is only coated on the outside, to act as a barrier.

Duke, beside painting the IC flat black, as some have suggested, what else could be done in terms of coating to help it disipate or keep out heat?

Yes, I know an IC sprayer would do a lot, but curious about coatings here for this debate.

 

A thermal dispersant coating would be suitable for the intercooler. It can dissipate heat up to 20% better than untreated metal.

 

Excellent Duke, thanks for that info. I have never heard this discussed in here.

How much would it cost and is it applied byspray or an industrial shop?

I assume it would be cheaper then buying an IC that disipates heat 20% more?

 

You'd need to be sure it wouldn't clog the core or it would do more harm than good. I guess it would still be worthwhile on the ends and top & bottom though even if the core wasn't touched.

 

I can't say how much ill effect putting a thermal barrier on the top of the IM will have. I know it is not ideal because the IM can be used to dissipate heat, most likely out of the top. You will gain some advantage by coating the bottom with thermal barrier though. I just hope you don't increase intake temps by coating the top.

You will definitely trap more heat, but if it is cooler than ambient, both below and above, you should be fine.

 

Here is a link describing what I am talking about...excuse the fact that it is from a circletrack.com:

http://circletrack.com/techarticles/...at/index2.html

 

Are you concerned that the coating my flake off espically around the turbo? I heard that you should not use the Sterling coating around the turbo?

thanks

 

Actually it's kind of risky to coat the inner surface
of manifolds ,turbine housing etc. The reason
being that most coatings are sprayed on but inorder
for the coatings to adhere properly, you have to be
able to etch the surface & theres no way you can do
that in tubes or tight confines.

 

Dont forget when on boost the inside intake temps will go up dramatcally...