Michael D. Porter wrote:
>
> If the effective pressure of the gas slug is raised, the
> velocity is raised, and the flow is raised (this is mostly true at the
> gas speed at which piston engines operate--optimally, 275-350 ft/sec
> velocity--and becomes less true were gas speeds to reach sub- and
> trans-sonic rates, around 800-1000 ft/sec).
>
> Wrapping the pipes (or having a flame-sprayed ceramic coating applied)
> simply slows the temperature drop of the gas slug, so its overall
> pressure is higher, and exit speed through the system is higher.
>
> All this only has to do with gas mechanics--it doesn't address the other
> issues of exhaust system design--pressure waves and sonics, which is
> where pipe tuning comes into play.
>
> Cheers.
>
> --
> My other Triumph runs, but....
This is why I subscribe to this list!!!!!!!!!!!!
Excellent explanation Michael:)
Cheers,
John Matthews
'61 Herald Racer
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