Quote:
Originally posted by jgriff
Can't quite see where you get that from Paul The page seems to say that a std ST4 header gets you there. There is alot of info there, and a header is a fairly complicated thing. They use pulse wave reasonace to create back pressure, to effectivly supercharge the next fuel charge in the cycle. (Cam duration becomes critical to this effect.) And so on it goes. blah blah blah. The up shot of it all is that there is a point where you have to decide how much life you want your crank cases to have. More HP and torque, less engine life. At the top end a race engine is good for max 1200hrs, and I believe ducati bin each set of cases at 600hrs. So all the big valves, port and polishes cam timeing and compression increases add up to more engine rebuilds. A happy medium has to be reached.
Both Bevan and Mr personality know this and both have other engines at there disposal, so they can afford to **** about.
Sorry Rob I was only interested in the price. |
this is brads quote from the page that makes me think that.
The results decided which header/muffler combination went on this 888 for sale, and which one stayed for the 851. That means the 851 is keeping its std ST4 headers and the Staintunes. I was hoping the std ST4 headers would out-do the DP headers a little, but certainly wasn’t looking forward to that hole in the curve. Makes the all std to final "as to be sold" result graph look a bit lame in comparison to what it could be.
where did you get all that technical waffle from anyway?
the rest of the article explains how the larger diameter allows better breathing at high revs, so it depends on the flavour of your compromise.
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