Interesting Paper on Surface Treatment/Corrosion, Compatibility

[RRoller123]

Very interesting.

https://www.blacksfasteners.co.nz/asset ... _69-74.pdf

Pete

[18Fiatsandcounting]

Thanks, Pete, good info. But are you sure you're not a material scientist or coatings engineer...?

-Bryan

[RRoller123]

I play one on TV.

Check out, on You Tube, the long running series from the University Of Nottingham in England, called "Periodic Videos". Really informative and very interesting series, not boring at all! The good Professor is quite entertaining, and a very good teacher.

Another excellent series for chemistry fans is You Tube, "Tyler Dewitt". Fantastic teacher, takes complex ideas and topics and makes them quite understandable.

As far as car videos go, I have found on You Tube, "Pete's Garage" (no relation) to be among the best. In depth, good illustrations and explanations, detailed process step instructions, gets into the whys and where fors, really good stuff.

Pete

[RRoller123]

So, I am wondering if anyone has experience with either of the 2 following surface treatments, for Exhaust Manifold and the immediate Down Pipes. (Not meant for the whole length of the system.

Eastwood's "High Temperature Coating" looks really good, and can be brushed or sprayed on. Cures with engine heat, and it can be delayed curing no problem. "Pete's Garage" had a good video on this, used on an antique Nash.

"Dry Graphite" sprayed from a rattle can apparently works too. There is an interesting video on You Tube about this, but I don't see a lot of other substantiating sources for its use.

I would like to leave the manifold and down pipe in the car, it is a hell of a lot easier, but wondering if the Eastwood drips?, and I don't want to do any spraying of the exhaust system while it is in there. Too much masking from over spray required.

Has anybody got experience with these products? Curious about whether they make a good result. Thanks!

Pete

[18Fiatsandcounting]

I don't have any experience with either of these, but I'm curious what the advantage is for the surface coating for exhaust pipes? Looks awesome, heat transfer, or ???

I did know a guy many years ago who did stock car racing (not the big leagues), and he had a manifold and header system that was coated with this super cool glossy olive color coating. Hard as all get out, and I believe it was done by some sort of chemical vapor deposition on the steel.

-Bryan

[RRoller123]

For these cars, because they are not HP or torque monsters, the advantage is primarily appearance. The dry graphite is def just for appearance. I will read up a little more on the Eastwood High Temp coating. My understanding is that it provides corrosion protection as well.

On monster engines, the hot rodders coat them, BOTH inside and out, to keep the under-the-hood temperatures down, and also I believe it slickens up the passageways and lets the exhaust slip out with a little less resistance. I have read and seen dyno tests that show about a 1% HP increase resulting from use of the internal coatings. Gaining say 4 or 5HP on a big engine certainly justifies coating teh inside, which is easy. The cans come with a 2 foot long, 360 degree hose/nozzle for applying the inside coating. It must obviously provide some sort insulating properties, to be able to lower the heat losses and thus temperature under the hood. I am not coating the inside, no need on these little engines.

For me it is 99% for appearance. Looks like siht right now. Especially with the 6 broken studs that just went out for removal, LOL.

As a side note, I got some 2000F VHT "Very Hi Temp" rattle can primer and paint, which I intend to use on the down pipes to the Cat but NOT on the manifold. I have seen mostly mixed reviews for how it works on manifolds, but it should be fine for the downpipe, where the temps drop off significantly.

Surface prep also appears to be very important, so the shop that is removing the studs will clean and blast the manifold as well. Something I can't do here in the shop. The down pipe I can easily degrease and clean up with some Scotch Brite before priming and painting. But I have no dip or blast cabinets.

Pete