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Old 02-05-2014, 11:13 AM
gwozhog gwozhog is offline
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Galvenized exhaust manifolds. Has it been done?

So my 2000 sportstar Predator engine is starting to show her age. It has the typical rust on the bottom that you see. Im pulling them off this weekend and replacing all the bolts too. Has anyone ever had there manifolds galvenized? It would seem like it would be a better alternative than painting them. I know it might look a little ugly but if it will never rust who cares about looks.
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Old 02-05-2014, 11:18 AM
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Originally Posted by gwozhog View Post
So my 2000 sportstar Predator engine is starting to show her age. It has the typical rust on the bottom that you see. Im pulling them off this weekend and replacing all the bolts too. Has anyone ever had there manifolds galvenized? It would seem like it would be a better alternative than painting them. I know it might look a little ugly but if it will never rust who cares about looks.
If you look for "header coatings", you will find some better options. Having them coated inside and out would be very nice indeed. Jersey Dave's anniversary boat has coated manifolds. It has been on my to do list for a couple years.
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Old 02-05-2014, 11:36 AM
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Originally Posted by gwozhog View Post
So my 2000 sportstar Predator engine is starting to show her age. It has the typical rust on the bottom that you see. Im pulling them off this weekend and replacing all the bolts too. Has anyone ever had there manifolds galvenized? It would seem like it would be a better alternative than painting them. I know it might look a little ugly but if it will never rust who cares about looks.
Coated mainfolds, new gaskets and having the mating surfaces on the manifold and risers trued up will keep the water/rust from weeping out. Over time, the gaskets degrade and the manifold warp ever so slightly to let the rust show through.
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Old 02-05-2014, 06:21 PM
TRBenj TRBenj is offline
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A high quality coating that wont burn off the runners (like paint does) will likely cost nearly as much as the exhaust manifolds themselves. My advice would be to buy some high temp paint and be done with it. It'll still burn off the runners, but who cares. I have a set of ceramic coated SS header/manifolds... but putting that kind of money into a set of cast irons is foolish, IMHO.
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Old 02-22-2014, 06:28 PM
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Jerseys boat was done by Jet Hot, sterling 1200 IIRC. I did my manifold in it

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Old 02-22-2014, 06:43 PM
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944 turbo Jet Hot 1200 parts
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Old 02-25-2014, 04:23 PM
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I've learned that galvanizing cast iron is generally not a good idea. One of our customers asked about galvanizing some cast iron trench grating we were getting from Neenah Foundry. Neenah is the company that makes most of the manhole covers & gutter drains, etc. in Minnesota & Wisconsin. They said that hot dip galvanizing cast iron can actually cause micro-fractures in the metal, which can lead to premature failure.
Kevin
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Old 02-25-2014, 04:36 PM
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in the grand scheme of things - a new set manifolds and risers is under a thousand.

I inspect mine every season.. make sure they are not weeping across mating surfaces... overkill but it let's me sleep at night...

filled my water jacket with evaporust last winter before season and removed a bunch of rust. if they look like this they are more than good to go. The orange is not rust - its the orange permatex.
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Old 02-25-2014, 04:37 PM
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Quote:
Originally Posted by bret View Post
Jerseys boat was done by Jet Hot, sterling 1200 IIRC. I did my manifold in it

sweet looking.
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