Found the following while surfing. Have wondered for some years just how much my Jet Hot coated Hookers reduced underhood temps. After putting them on, taking a highway drive (no less!) and popping the hood, I was amazed by the lack of that extremely "hot blast" one would get compared to the old non-coated headers!
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HERE are a FEW TEMPERATURE READINGS TAKEN at DAYTONA MOTOR SPEEDWAY:
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. The thermal coating becomes part of the header material. Most of the other coating brands are comparable to these figures (if they are multi-layer, inside and outside of tube applied using proper materials).
Courtesy:
http://www.centuryperformance.com/exhaust-header-heat-wraps-do-not-use-spg-138.html
