Cool Glyn...and I do agree that with 180 phasing, if the 2 into 1 is designed well enough (and it sounds like you are definately on the right track!), you will not have nearly the "problems" with soundwave turbulence that one would have with a 3 cylinder.
How was low end grunt compared to the 2 into 2? Thats actually quite impressive that it was only 4hp and 300 revs down on peak.
Originally Posted by gplracing
Hi guy's I'm Glyn the guy that built the 2-1.
This is still in the very early stages of development, but has shown some goos results.
With the post quoted your are right to a point about the pulses getting confused. But the way the crank is phased plays a huge role in the end result.
As this is going onto a parallel twin that is phased at 180* this is in my favour. The first one was dyno'd last week in Germany, a different design to the one shown here but the same principle.
It did quite well for it's first run only 4hp down on the 2-2 set up he was running and it peaked at 9400k against his 9700k with the 2-2.
I will agree that a 3-1 is asking for trouble and will never be able to give you any top end power to speak of, but the 2-1 with a 180* can be made to work really quite well.
How fare I'll take this I don't know as I am time limited at the mo, but I know that it will be as good as any after market off the shelf pipe currently out there.