Forum for discussion of MG and MGB motorsports, historic and current (SCCA, NASA, VARA, etc) car preparation, engine, bodywork, suspension, drivetrain modification.
Jet Hot says it increases horsepower and reduces header temperature. The local powder coating shop says crystals and flaking can be a problem and doesn't recommend it. Should I pay the extra price and go with Jet Hot or is the local shop correct.
Go with Jet Hots idea. If you don't coat you will get internal rusting if your car sits and it too will flake. Albeit very slowly. Coat and they will last a long time. My biggest problem to date is tube cracking just below the flange. I run a very hot 1400 degree EGT with a very lean mixture. My headers are made by Kirk and non coated. I think the coating would have stopped this. They have served me well for the last nine or so years though.
Bandit Racing Wrote:
Your money would be better spent on a trick carb, flowed head, race exhaust system and a set of r compound tires. Lighter flywheel, gear set for bottom end...
my 2 cents. Nice B.
s
Not to mention, it's a pain in the butt to do repairs if your headers are ceramic coated. Mine are Jett Hott coated. From what I understand, in order to do any repairs both inside and outside need to be ground down in order for a weld to adhere.
Actually, repairs are one of the reasons I stick with HPC. When you ding one up they pressurise them with nitrogen, heat the dinged area to pop them out and re-coat them. A very trick process :)
Very interesting Basil. The collector on my header looks like a pancake for last year at Buttonwillow. I really need to go with a through-tunnell but can't afford to go that route right now. I was just thinking of taking off the damaged part and having a new collector welded on.
If you do a new collector, why not make it a slip-on rather than a weld on?
It's actually a little further up than the collector but was at a lack for better terms. It was flattened when I bought the car but really pancaked the area when I cut a rumble strip at Buttonwillow
Thanks for the info guys. The local shop indeed does ceramic coating. Hap, I'll check out High Performance coatings. Thanks.
Mark
MarkJ Wrote:
Oh, sorry, I'm trying to read to quickly here. Thanks for the input Basil. So that makes two of us that agree with you, me and Hap.
Actually the headers are V8 headers going on my 3.9L Rover swap into a 1977 MGB. I already have the headers, I just want to make them look nice and keep them from rusting for a few years. I liked the claim by Jet Hot that their coating reduces header temperatures. They actually have some pretty convincing data. And if it prolongs the life of the headers then I get two for one.
But, the guy at the local shop scared me with the crystallization and flacking when applied to the inside of the header comments so I thought I should ask the experts. (that would be you guys).
Thanks,
Mark
Rust comes from condensation inside the header. Coating the inside will be a rust preventative.
Basil Adams Wrote:
