Jet coating exhaust ports

Merc Cruzer

Merc Cruzer

Well-known member
Has anyone tried Jet coating the inside of the exhaust ports? The product claims to reduce heat transfer by up to 300 degrees?
 
We did it on the 35 engine we are building. The guy at the coaters said it was a major pain and he would never do it again. After we spend hours porting and polishing he had real troubles getting it to lay flat and even around the ports.
 
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Dave:

Any issues for the block in having to heat it to the temperature required and the length of time at that temperature?
 
Dave:

I take it that you used power Jet coating.....since porcelain coating is a liquid, I would wonder if the application would be easier?
 
He used the liquid. That was what made it difficult. He said it was kind of like runs in paint. Just enough and you have a nice smooth finish, a little too much runs and dimples. It took him 4 or 5 time to get the liquid on right. One of those jobs where "if I had to charge you for the work involved you could afford it". That's why he won’t do it again.
 
JDL: The jury is out on that one. We are now rebuilding the McCullough supercharger for the top and haven't been on the road yet. If all goes right this winter we should be on the road next summer. My buddy did it on a XKE race car and it made 20 to 30 degree difference.
 
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From the old Fordbarn, a gent suggested to me that he used Black Satin from Speedway in a V-8 60 that he ran in a midget. He did not know how much it helped because there was no before and after analysis. I gave it a try on my 8BA that is in my '36 pickup, but I only applied it to the center port. Soon I will be building some new headers for my truck and when I remove the old ones I guess I'll be able to see if it stuck OK.

I prepped the center port by putting some tape over the seats to protect them. Then I installed a couple of old valve assemblies. I sealed off the heat riser holes. Now with one of those spot sand blaster guns that have the bags on them to recycle the media, I put the nose of that up the exhaust port to blast it. I hoped that I was creating a mini blasting cabinet inside of the exhaust port and valve cavity. Following clean up from that, I used an airbrush gun to shoot the Black Satin into the port and cavity from below and above.

I always thought that I could measure the effectiveness of the coating by using an infared temp gage. Alas, the friend I had with one of those is not available, so I have not done that. My truck runs well and I control the temp OK but I have a lot of mods on it, the exhaust dividers, the 409 water pump and a pusher electric fan that I think sometimes impedes air. So, there is no real telling how well the coating works.
 
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