Question? Slip On

[The Spaceman_imp]

Stealth, I've been trying to figure out your feeling that your bike runs cooler with the 2Bros since you posted it in another thread. I'm not an engine design engineer or even an expert in thermodynamics, but a couple things about it bother me:

- Metal is a great heat sink and is also great at transferring heat to the air. That's why computer chips have the big fins on them, as do our bike engines. The CB's OEM can has a LOT more metal than the 2Bros, which has only a very thin skin, so if anything, I'd think it would pull more heat from the engine than the much smaller 2Bros can.

- When you open the exhaust with a free-flowing muffler, unless you change the fueling, the bike will run leaner. Leaner running means hotter running. Having said that, the CB was the first and only bike I put an aftermarket exhaust on that didn't need FI changes to run properly, but I would still think it ran leaner.

Why do you think the CB runs cooler with the 2Bros? Did you add a temp gauge, or have you checked with one of those laser sensors?

BTW: as much as I like my 2Bros exhaust, I didn't notice any difference in header discoloration between it and the OEM. My headers seem to get stained by water, as in running through puddles or in the rain.