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Originally Posted by kwhauck
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Below are the test parameters and results using Jet-Hot Coatings® coated and uncoated headers:
(10 Laps, same engine and car with identical headers, one standard, one Jet Hot® coated. Engine is ran between 6,900 and 7,500 RPM, and temperatures are measured immediately after the last lap with the engine idling at 2,000 RPM with identical sustained EGT's of 850º.)
MEASURED AT: JET-HOT® COATED NO COATING DIFFERENCE
1" from engine 300º 750º - 450º
2" above header port (on header) 210º 300º - 90º
1" above floor pan (in car) 115º 165º - 50º
Pretty impressive difference, and with any of these coatings you should take care to not damage the headers. .............
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Note that compares uncoated header to coated header, not to stock manis.
Impressive as that is, the stock cast-iron manifolds with their stainless heat shielding kept my underhood temps lower than what it became after changing to TOG headers with a ceramic coating.
The extra surface area of the tube headers dissipates more total heat, even though it may measure lower than stock from point to point in some cases.
I compromised and put layers of wrap between the headers and the components above them I wanted to shield, leaving the area open below the headers and space around the crossover tube.
Now wherever the wrap touches the header, a discoloration will form (so far no actual corrosion), so keep in mind that once that happens, the good looks of the new headers will be lost.
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