DIY ceramic exhaust coating update
Discussion
Following up from the earlier thread, finally got round to fitting the new manifold treated with the brushed on ceramic coating from www.racestuff.co.uk
So does it reduce exhaust temperatures?
Well, after arriving at Custom Chrome who were making up a custom system from the manifold back I tried taking a temp reading off one of the original downpipes with the engine idling. Problem was it fluctuated so much (by tens of degrees) all I could tell for certain that it was something over 100 C
Best guess from the way it went was around 140 C
Got back home with the new system on, took reading off downpipe on new coated manifold in near to same spot as I could and got much steadier reading - of around 250 C!
However, as the engine sat there idling this fell rapidly to around 140 C on one downpipe and around 100 C on the other.
Guess I really needed to have had engine left at idle for exact same amount of time after a run to have got truly comparable results, and the car certainly had a bit longer to cool prior to the 'before' test.
Even so, the 'before' reading was done with a standard system with cast iron manifold and steel downpipes whereas the 'after' was with a tubular four branch so it wouldn't have been directly comparable anyway.
I can say though that on the way back the temp needle was slightly lower than normal, but can't say if that was down to coating, the different exhaust or any other factor.
So can't tell you anything conclusive I'm afraid guys. Still, even if all the stuff does is keep the manifold satin black rather than rusty brown (or black with white bits like VHT goes) then it'll still have been worth doing.
So does it reduce exhaust temperatures?
Well, after arriving at Custom Chrome who were making up a custom system from the manifold back I tried taking a temp reading off one of the original downpipes with the engine idling. Problem was it fluctuated so much (by tens of degrees) all I could tell for certain that it was something over 100 C
Best guess from the way it went was around 140 C
Got back home with the new system on, took reading off downpipe on new coated manifold in near to same spot as I could and got much steadier reading - of around 250 C!
However, as the engine sat there idling this fell rapidly to around 140 C on one downpipe and around 100 C on the other.
Guess I really needed to have had engine left at idle for exact same amount of time after a run to have got truly comparable results, and the car certainly had a bit longer to cool prior to the 'before' test.
Even so, the 'before' reading was done with a standard system with cast iron manifold and steel downpipes whereas the 'after' was with a tubular four branch so it wouldn't have been directly comparable anyway.
I can say though that on the way back the temp needle was slightly lower than normal, but can't say if that was down to coating, the different exhaust or any other factor.
So can't tell you anything conclusive I'm afraid guys. Still, even if all the stuff does is keep the manifold satin black rather than rusty brown (or black with white bits like VHT goes) then it'll still have been worth doing.
GreenV8S said:
Well the Black Satin has turned up, blimey you don't get much for sixty five quid do you!
Now I just need to find somebody in MK to sand blast the manifolds for me. Any recommendation?
Now I just need to find somebody in MK to sand blast the manifolds for me. Any recommendation?
Yes, the tins are rather small. Did wonder if there'd actually be enough to do the manifold for my Quantum, which has more pipework than any 4 branch I've ever dealt with. In the event I still had about 1/2 tin left so reckon one small tin would do two V8 manifolds no problem.
As for sandblasting in MK, can only suggest Yellow Pages.
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