scrambler73 wrote:
jyrgNorway wrote:
What did the H2's with 3:1 chambers you have tried, produced with effective chambers?
I cannot remember what the butt dyno difference was between regular dencos and the 3 into 1 in terms of overall power as the 3 into 1 seems to pull so much harder right off of the bottom.
The biggest thing that comes to my mind is the "WALL" that the 3 into 1 hits when it gets to the mid 6xxx's RPMS.
All of that said, I think that you are onto something in terms of Pipe Volume. The Strader diameter is tiny compared to the Figaroli in your photo.
All of the 2 into 1 and 3 into 1 chambers that are produced for snowmobiles are 2x's larger still than the Figaroli, and while they obviously aren't making as much HP as individual chambers still pull your arms out of their sockets when you grab a handful of throttle.
Like Sverre said, if someone could do a bit more R&D into a modern design 3 into 1 that would give unlimited cornering clearance with only a mild drop in overall HP for an H1 and H2, I would be first in line.
Jorgen, do you have a bone-stock port H2 to mount that Figaroli on to compare to stock or individual chambers???
Good Stuff Here.. Love that you are really digging deep. Been a while since threads like this have been posted.

I have that, and I will definately try that combo later.
Did more dyno testing today, me and 2 friends.
DENCO
F BY GAST
TNT
WIRGES, shortened belly and removed silencer.
This dyno sheets will be posted, but first I am gonna write an article about the results in the norwegian triples club magazine.
A few hints though:
Modified Wirges are very good pipes.
1 brand produced 120 rwhp, but at a very high rpm.
Dencoes are extremely great street pipes, and had the smoothest curve I have ever seen.
Jørgen