In a message dated 11/20/2010 10:49:58 A.M. Eastern Standard Time,
eanderson@carolina.rr.com writes:
As I said, the results seem reasonable to me - and yes,
you woke me up but had not had my 2nd cup of coffee {:>).. EVO should
read Exhaust Valve Opening - my bad {:>)
Ed
Longer headers=lower torque peak.
Shorter headers= higher torque peak.
Larger pipe diameter= broader power band. Less peak torque.
Smaller pipe diameter=narrower power band higher peak torque.
Shorter collector=shorter power band.
Longer collector =broader power band.
Same number of bends all the same distance from the flange, where
possible.
The run out of the engine straight out as far as is possible before the
first bend.
It is not that the perfect system must be developed for each engine
installation.
It is just that the system must not leak. Must not fail and start a fire.
Must not
reduce the engines output substantially. And be quiet enough to hear the
prop tips.
The increased top speed after a muffler change speaks volumes.
Lynn E. Hanover