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Roadless
04-13-2008, 10:12 AM
Always curious about things, so has anyone ever measured the gain to be had from proper cam timing ?
Also, being the persistant type, has enyone actually gained power from just heatwrapping or coating their headers ?
If so, is there a difference in performance between those two ways of thermal shielding?

kiddo
04-13-2008, 09:27 PM
The cam timing on the Rotax V990 can be way off or close enough due to production tolerances, so it is not possible to establish a common gain or number by correcting it. Many motors from all of the mass produced manufactures suffer the same issues. Setting one up correctly is the differenece between an outstanding runner and an also-ran.

I can tell you for a fact that completing this job properly is worth the effort and/or cost - the V990 really responds nicely to fine tuning because it's basic numbers, parts, and configuration are so good.

They come standard with stainless steel exhaust headers which hold heat very well. Wrapping them would not be as much of a gain as would be modifying them.

You can search around for more info on valve train setup and exhaust mods, or if needed, I can re-post a summary later.

Ciao.