[Ducati] cheap power gain ?

[Art Ramos]

Why of course Philippe!
After taking into consideration the depth of the protrusion into the core
area of flow, then dividing by the net total problem surface area, plus the
cooling exhaust gasses velocity squared by the overall pipe length, then
halved. You should see the usual or normal gain at over 17,000 rpm. With no
appreciable gain in decibels. Now if you had ground then polished that area
with a 1200 grit stone and then buffed with some Jeweler's Rouge, the
velocity would have hit hypersonic speeds creating a negative pulse pressure
wave effectively maintaining the same results as I have stated above, but at
a much lower rpm level. Giving you a substantial increase in power and gas
mileage at around 1500 rpm. With the latter you can have your cake and eat
it too.

In simple layman's terms, it couldn't hurt to do so! : )

Art



On 12/27/06, Philippe Coulon <pcoulon at oxya.com> wrote:
>
> Hello
> I changed the bottom exhaust pipe (due to trialing on the walkway in the
> traffic jams).
> I noticed on the new and old part that the welding created some
> protuberances in the exhaust pipe (up to 5mm for the biggest).
> Dremelling them away with the flexible instrument seems easy (I succeded
> on the old pipe ). I am not talking about polishing, just removing metal
> that shoud not have been there in the first place.
> But will it have mesurable effect.
> The psychological one is there : no uglly welds inside.
> Did someone did that and dyno ?
>
> Philippe
>
> *****
>
>