Greg Brown Exhausted - 90 Zyclamrot Metallic S4
07-31-2010, 10:57 PM
#61
Not the sharpest tool in the shed
Rennlist Member
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Thread Starter
Is the exhaust coating serving as a heat shedding or thermal barrier coating or neither? On the one hand, one wants to cool the exhaust to increase density and thus flow I think. On the other hand, one wants to protect all the nearby components. If I've understood this correctly, there's a compromise here. My personal view is that with the 304 SS priced like gold these days, from the looks perspective I'd leave them uncoated or make the whole thing from mild steel.
Greg was disappointed I decided I was going to coat the exhaust system (decision made post order). The stainless looks more beautiful imo than the coated system. But I gots to do whatever I can to keep temps down.
08-01-2010, 12:12 AM
#64
Nordschleife Master
The coating is meant to act as a thermal barrier. My great concern is running the car hard in the summer desert heat and the attending high under-hood and under-carriage temps combined with high ambient temps. replacing the wiring loom in the car as it is because it is already baked and a lot of cracking insulation and that was from living in a less hot/dry climate for the first 20 years of it's life (Midwest U.S.). Will also reduce the temps near fuel/hydraulic lines as well as interior.
Greg was disappointed I decided I was going to coat the exhaust system (decision made post order). The stainless looks more beautiful imo than the coated system. But I gots to do whatever I can to keep temps down.
Greg was disappointed I decided I was going to coat the exhaust system (decision made post order). The stainless looks more beautiful imo than the coated system. But I gots to do whatever I can to keep temps down.
08-01-2010, 02:24 AM
#65
Former Vendor
08-01-2010, 03:44 AM
#66
The coating is meant to act as a thermal barrier. My great concern is running the car hard in the summer desert heat and the attending high under-hood and under-carriage temps combined with high ambient temps. replacing the wiring loom in the car as it is because it is already baked and a lot of cracking insulation and that was from living in a less hot/dry climate for the first 20 years of it's life (Midwest U.S.). Will also reduce the temps near fuel/hydraulic lines as well as interior.
Greg was disappointed I decided I was going to coat the exhaust system (decision made post order). The stainless looks more beautiful imo than the coated system. But I gots to do whatever I can to keep temps down.
Greg was disappointed I decided I was going to coat the exhaust system (decision made post order). The stainless looks more beautiful imo than the coated system. But I gots to do whatever I can to keep temps down.
08-01-2010, 05:43 AM
#67
Rennlist Member
The only good thing about that wrap stuff is that it muffles exhaust leaks. Otherwise I just think it is a oil collector for a good fire.
I don't remember which but some of the "hot" coatings will burn off after not too long. When I re-build my 944 Turbo I was going to get Swain ceramic coating inside and out from the heads to the turbo. Heat loss before the turbo is pressure loss to drive the turbo.
I don't remember which but some of the "hot" coatings will burn off after not too long. When I re-build my 944 Turbo I was going to get Swain ceramic coating inside and out from the heads to the turbo. Heat loss before the turbo is pressure loss to drive the turbo.
08-01-2010, 10:47 AM
#69
Nordschleife Master
Jethots and whatnot can be used to paint the insides, but in a turbo exhaust manifold, such paints say bye bye right away. The extra consideration with turbo cars is that if the part with inside coating is upstream of the turbine, and if the coating is real ceramic coating that is really hard, it may be possible for the flaking coating to cause turbine wear.
So, my humble opinion is to coat only the outside and not the inside.
08-01-2010, 01:41 PM
#70
Not the sharpest tool in the shed
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William - I love the look and patina of SS header and exhaust systems, tres sexy. The heat is a major influencer on this though.
I love the zyclamrot color too. You've seen more of the can than I have. Looking forward to ultimately bringing it home.
I love the zyclamrot color too. You've seen more of the can than I have. Looking forward to ultimately bringing it home.
Dan, Zyclamrot is an outstanding color in person. I understand your heat issue, but you can see from the photos below that SS looks great (according to me, lol!). I also remember reading that hot headers flow better, not to mention the cool amber patina that they develop afterr may heat cycle
08-01-2010, 02:51 PM
#71
Rennlist Member
One question: Does Greg take American Express? 
