How hot do cast iron exhaust manifolds get?
#165913
12/10/08 10:14 PM
12/10/08 10:14 PM
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I painted my 340 stock exhaust manifold with hi-temp paint and it blistered as soon as I fired the motor up?
I wired brushed off all surface rust, hit it with some Ospho, then painted.
What went wrong?
Last edited by cnxt; 12/10/08 10:15 PM.
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Re: How hot do cast iron exhaust manifolds get?
[Re: fjr340gts]
#165915
12/11/08 07:51 AM
12/11/08 07:51 AM
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Joined: Jan 2003
Posts: 8,064 Arlington, Texas
earlybee
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Quote:
I measured mine with a laser pyrometer and they usually are in the 460-520* range
They get hotter than that under load.
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Re: How hot do cast iron exhaust manifolds get?
[Re: ScottSmith_Harms]
#165920
12/11/08 01:03 PM
12/11/08 01:03 PM
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hooziewhatsit
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Sounds like the method (sans the 90wt ) to season a cast iron skillet. That should work great. -Dave
If you ever find yourself in a fair fight, your tactics suck.
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Re: How hot do cast iron exhaust manifolds get?
[Re: RapidRobert]
#165921
12/11/08 01:56 PM
12/11/08 01:56 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
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That is so weird Scott! Wonder if that would work on headers? I am tired of spraying Plasticoat white on the Hookers. Isn't there a coating that Eastwood or somebody sells?
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: How hot do cast iron exhaust manifolds get?
[Re: MoparKansas]
#165926
12/11/08 06:21 PM
12/11/08 06:21 PM
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The 90w does sound unconventional! I might just have to try it. I'm still curious what happened with the paint. It started separating as soon I fired the motor up! It actually looked like there was a latex glove on it and was being blown up. For some reason the paint didn't even attempt to bond with the metal.
Really frustrating.
Last edited by cnxt; 12/11/08 06:23 PM.
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Re: How hot do cast iron exhaust manifolds get?
[Re: BDW]
#165927
12/11/08 06:31 PM
12/11/08 06:31 PM
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1MYTGTX
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FWIW I had mine Jet-Hot coated and have looked like this for the past 5+ years now...reduced the underhood temps as well
1MYTGTX
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Re: How hot do cast iron exhaust manifolds get?
[Re: BDW]
#165929
12/11/08 09:14 PM
12/11/08 09:14 PM
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Posts: 902 Seattle, WA
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Quote:
I wired brushed off all surface rust, hit it with some Ospho, then painted.
I'd bet it has something to do with the Ospho. Probably hadn't fully cured so you had some moisture trapped under the paint that bubbled once you heated them up.
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Re: How hot do cast iron exhaust manifolds get?
[Re: rss]
#165930
12/11/08 10:35 PM
12/11/08 10:35 PM
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Your probably right, but it might have something to do with cleaning it with easy-off oven cleaner initially. I thought I rinsed it well, but maybe not enough? After letting them dry for a day I then used a wire bush on a drill to clean it up further. I then put on the Ospho. Manifold actually sat then for a week at this point(I had to go out of town on business).
After painting, I set it out in sun for 2 days.
But it must have been some sort of trapped moisture, that paint didn't last 10 seconds!
Last edited by cnxt; 12/11/08 10:37 PM.
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Re: How hot do cast iron exhaust manifolds get?
[Re: RapidRobert]
#165932
12/11/08 11:53 PM
12/11/08 11:53 PM
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Joined: Nov 2004
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GoodysGotaCuda
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Quote:
but 1st I'm going to try some black barbeque grill paint.
..dont even waste your time.
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