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  #1  
Old 06-23-2007, 04:35 PM
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exhaust manifold holes

HI guys,

Removed the exhaust manifold for painting, can you inform me why some holes are bigger then others, the screws are all of the same size!!!

Don´t know wich color to use, maybe silver so I can use the same ink on my calipers!

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exhaust manifold holes-exaust.jpg  
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Old 06-23-2007, 04:52 PM
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I would guess that the holes are bigger to allow for a bit of expansion.

Good luck getting the paint to stay on.
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Old 06-23-2007, 05:05 PM
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Yes, for expansion. Since the manifold is iron and the head is aluminum, they expand at different rates.
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Old 06-23-2007, 05:18 PM
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Quote:
Originally Posted by Matt L View Post
I would guess that the holes are bigger to allow for a bit of expansion.

Good luck getting the paint to stay on.

I'll use high temp paint, why whouldn´t it stay on??
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Old 06-23-2007, 05:56 PM
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I used HiTemp Engine paint, color Cast Iron. The first time I started the engine they turned pink. The paint had about a week to dry so I thought all was well. Oh well, it finally burned off and are the same color of rust they were before the paint. I do believe there is a special Header paint available but I think it is rather expensive and hard to find. Ceramic coating is also available and it holds up perty good. Also expensive and not to many places do it. Usually it is a place that does powder coating.
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Old 06-23-2007, 05:59 PM
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Please read the directions on the can VERY closely. You MUST follow the curing directions exactly or it will burn and flake off when it gets hot.

Most say to paint the manifold, let it dry for 10 minutes, cure in an oven at 450-650*f for ~4 hours and let it naturally air cool down to room temp before it's used on the engine.
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Old 06-24-2007, 12:54 AM
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Quote:
Originally Posted by ForcedInduction View Post
Please read the directions on the can VERY closely. You MUST follow the curing directions exactly or it will burn and flake off when it gets hot.

Most say to paint the manifold, let it dry for 10 minutes, cure in an oven at 450-650*f for ~4 hours and let it naturally air cool down to room temp before it's used on the engine.
thats the problem though, this will work on a gasser, but diesels burn about 3 time hotter.
which obviously means that the manifold is going to be much hotter...
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Old 06-24-2007, 12:56 AM
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Originally Posted by benzforlife View Post
thats the problem though, this will work on a gasser, but diesels burn about 3 time hotter.
which obviously means that the manifold is going to be much hotter...
Other way around. Gassers run much hotter.
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  #9  
Old 06-24-2007, 01:08 AM
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What's the temp that this cars achieve at the manifold?
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Old 06-24-2007, 01:17 AM
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Gassers can get 1600*f+, stock diesels usually run 1000-1250*f.
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  #11  
Old 06-25-2007, 12:52 PM
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After cleaning it pretty good, I painted it with +600ºC INOX based paint, now it has to dry for at least 72h to gain maximum resistance, this paint looks pretty good!!!!!!
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exhaust manifold holes-exhaust2.jpg  
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  #12  
Old 06-26-2007, 01:49 PM
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Pic of the finished product:
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exhaust manifold holes-exhaust3.jpg  

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