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Re: How hot do cast iron exhaust manifolds get? [Re: GoodysGotaCuda] #165933
12/12/08 12:08 AM
12/12/08 12:08 AM
Joined: Nov 2003
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Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
it wont even work with good prep? When I'm flame broiling my steaks it get pretty hot.


live every 24 hour block of time like it's your last day on earth
Re: How hot do cast iron exhaust manifolds get? [Re: RapidRobert] #165934
12/12/08 12:15 AM
12/12/08 12:15 AM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
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i've prepped the heck out of two sets of headers. Well, short of media blasting, the paint hasn't held up for more than 3-4 months of weekend use.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
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Re: How hot do cast iron exhaust manifolds get? [Re: GoodysGotaCuda] #165935
12/12/08 12:19 AM
12/12/08 12:19 AM
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Posts: 4,501
Gainesville,FL
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Thermal coating is the best if you want it to last.I have mine done locally.

Re: How hot do cast iron exhaust manifolds get? [Re: GoodysGotaCuda] #165936
12/12/08 01:01 AM
12/12/08 01:01 AM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

i've prepped the heck out of two sets of headers. Well, short of media blasting, the paint hasn't held up for more than 3-4 months of weekend use.


alright I'm convinced. I will explore another option


live every 24 hour block of time like it's your last day on earth
Re: How hot do cast iron exhaust manifolds get? [Re: ScottSmith_Harms] #165937
12/12/08 08:21 AM
12/12/08 08:21 AM
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Posts: 1,787
Big Sky Country
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MO_PA Offline
top fuel
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Big Sky Country
Quote:

Skip the paint. First you must remove and media blast the manifolds clean,then wipe them down with a liberal coat of clean 90 weight




I agree with Scott's oil treatment except I use ATF instead of 90 Gear oil, the ATF leaves a blueish tan/gray and it last a long time.

Re: How hot do cast iron exhaust manifolds get? [Re: dmerc] #165938
12/13/08 12:42 PM
12/13/08 12:42 PM
Joined: Jan 2006
Posts: 8,162
USA
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360view Offline
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850 sounds about right for an engine that has been running for awhile

I have not measured more than 1280 F
at short bursts of full throttle
at the hottest cylinder
on a 1995 360,
but I would guess in the worst case
it would approach 1500 F on the inside of the manifolds
and perhaps 1400 on the outside

The black magnetite coating
(like on impact sockets)
that people are trying to make on the outside
using the oil coating will break down at those 1200 to 1400 temperatures

$150 for a thermal barrier inside and another anti-corrosion coating outside sounds like a great bargain to me for a pair of manifolds

Re: How hot do cast iron exhaust manifolds get? [Re: 360view] #165939
12/13/08 01:24 PM
12/13/08 01:24 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
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Spokane Washington
Quote:

The black magnetite coating
(like on impact sockets)
that people are trying to make on the outside
using the oil coating will break down at those 1200 to 1400 temperatures





Maybe true but in real world testing I haven't seen it breakdown much at all, as I mentioned a light periodic touch up is all it takes.


Re: How hot do cast iron exhaust manifolds get? [Re: ScottSmith_Harms] #165940
12/13/08 01:38 PM
12/13/08 01:38 PM
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Columbia, CT
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Columbia, CT
The ATF/oil treatment has been around for a long time. I used it back in the 80s. I don't even bother anymore...lol. No car ever looked that way on the dealer lot. They already had rusty manifolds from running and loading on trains and trucks. They were all a light cream/rust color...lol.


Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: How hot do cast iron exhaust manifolds get? [Re: moper] #165941
12/13/08 01:41 PM
12/13/08 01:41 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
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Spokane Washington
Quote:

No car ever looked that way on the dealer lot.




True, but if you prefer to not see rust it's a heck of allot closer to looking original than ANY kind of paint or high temp coating. Oh yea, and it's practically free!


Re: How hot do cast iron exhaust manifolds get? [Re: ScottSmith_Harms] #165942
12/13/08 02:02 PM
12/13/08 02:02 PM
Joined: May 2005
Posts: 4,679
Florida
BDW Online content OP
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Florida
Scott,

You ever coat them already on the car? I really don't want to pull them off again.

I know you mentioned a light touch up, what about the initial job?

Re: How hot do cast iron exhaust manifolds get? [Re: BDW] #165943
12/13/08 02:18 PM
12/13/08 02:18 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
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Spokane Washington
No, won't work well, you need to remove them, blast them, and then coat them if you want good results. Just slopping some on already half baked /rusty manifolds will usually result in a blotchy weird looking finish.

Re: How hot do cast iron exhaust manifolds get? [Re: ScottSmith_Harms] #165944
12/13/08 02:26 PM
12/13/08 02:26 PM
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Posts: 13,544
md
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mopars4ever Online content
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I was told to try mineral spirits and graphite by a older man at a car show I was attending a few years ago. I bead blasted the manifolds and rubbed it on. It is messy but they have stayed nice looking so far.

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