Yeah, and my friend in SoCal, the Racer again, says that the 20B racers down there wrap, and it really helps.  But then again, racers......

Greg

Greg,

And they tested this how? With what instrumentation? So you know I have built racing cars and bikes for others and I have road raced motorcycles myself. The only coating or wrap I could find that worked was the Jet-Hot coating. That was on a motorcycle. The in cowl temps were reduced by 15°F. There wasn't any HP increase that I could determine reliably. I did record an increase on the wheel dyno but not enough to be certain it wasn't just different temp and baro pressure conditions. The rotary exhaust temperature is so much hotter that Jet-Hot has only had a suitable coating for about a year and a half. I'd try that if you must. Shielding, even thin and close has proven to be effective, as has zirconia ceramic blanket. The wrap may not have actually caused the cracking on the exhaust system mentioned previously but it certainly makes it impossible to detect cracks before they get dangerous. I'd stay away from wraps for just that reason.

Bill Jepson