Jet-Hot coatings for turbo manifolds, housing
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Joined: Jun 2003
Posts: 34
Jet-Hot coatings for turbo manifolds, housing
From what I've been able to read, most people don't coat the inside of the exhaust manifolds for turbo motors because they're concerned about the coating flaking off, being sucked into the turbo, and destroying the turbo. Is this really an issue? Is there no way to get a coating inside the manifold that will stay in place?
Also, are coatings on turbo housings worthwhile? Holding in extra heat is always a good thing (heat = energy = power) with turbos, but does this give any really noticeable returns? Does it improve the longevity of the housing due to less corrosion or thermal cycling extremes?
Also, are coatings on turbo housings worthwhile? Holding in extra heat is always a good thing (heat = energy = power) with turbos, but does this give any really noticeable returns? Does it improve the longevity of the housing due to less corrosion or thermal cycling extremes?
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Joined: Jan 1999
Posts: 839
From: Minnesota
Flaking that occurs from coating the inside of the housing happens because of impeller contact. There is little clearance between the housing and impeller. When coating is applied it takes away from that clearancing. I have seen shops machines the inside of the housing to the thickness that the coating produces. After this is done no problems occured. IMO: if your worried about heat just get a blanket/cover for it
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Joined: Jun 2003
Posts: 34
Originally posted by sleeperz28
Flaking that occurs from coating the inside of the housing happens because of impeller contact. There is little clearance between the housing and impeller. When coating is applied it takes away from that clearancing. I have seen shops machines the inside of the housing to the thickness that the coating produces. After this is done no problems occured. IMO: if your worried about heat just get a blanket/cover for it
Flaking that occurs from coating the inside of the housing happens because of impeller contact. There is little clearance between the housing and impeller. When coating is applied it takes away from that clearancing. I have seen shops machines the inside of the housing to the thickness that the coating produces. After this is done no problems occured. IMO: if your worried about heat just get a blanket/cover for it
Registered User
Joined: Apr 2001
Posts: 1,132
From: Florida
You probably already know this but if you do get them coated on the outside, make sure you use Jet hots 2000 coating. It withstands upto 2400 degrees as opposed to the standard coating that only withstands upto 1300 degrees.
Thx,
Claude
Thx,
Claude
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Joined: Mar 2001
Posts: 956
From: Winston Salem, NC
I have heard the same thing about coating on the inside, and honestly I have heard lot about jet hot coating flaking off the outsides of stuff lately so I would say its a valid concern. Will those little flakes hurt the turbo? Dunno about that one...
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Joined: Feb 2001
Posts: 1,450
From: Belleville, IL
Swain told me they would not coat the inside of turbo headers because of liability over the coating flaking off, especially on mild steel. I've heard about problems w/ Jet Hot's coating coming off as well, so I have a tough decision to make on my manifolds.
FWIW, I've seen apex seals from an RX7 hit a turbine before. It will chip/bend the wheel, but that's about it. I can't see how a small piece of coating will destroy a turbo.
FWIW, I've seen apex seals from an RX7 hit a turbine before. It will chip/bend the wheel, but that's about it. I can't see how a small piece of coating will destroy a turbo.
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