Duncan racing Pyramid reed valve

[honda250r]

I want to know how one would do on a trx250r someone has to have them an thier R that is a member on this site

[honda250r]

how do you port a cage

[flotek]

with vforce you have double stacked reeds which offer alot more flow velocity and they are carbon fiber for response ..now on the duncan they are epoxy and open on the sides looks neat!.. but theres a certian resistance (<for lack of a better word)thats deisgned for the valve .might thin k of it as pistons go up and down not side to side just another reason duncan should stick to making doughnuts

[ONLY2STROKES]

Originally Posted by honda250r

I want to know how one would do on a trx250r someone has to have them an thier R that is a member on this site

i would imagine the results would be the same no matter what 2 stroke engine they were used on.

[ONLY2STROKES]

Originally Posted by honda250r

how do you port a cage

they are opened up some.still need either 1 or 2mm for the reeds to seat on.and the bridges are knifed for better flow.

[honda250r]

so the flat briges i can make to a point with a file or die grinder

[fiveOnick]

Just because it has two side reed pedals and looks bigger means nothing. High velocity laminar flow is the key, a Pyramid does not aid laminar flow. Simple comparison, I have a CR VF that has a smaller intake tract than the TRX VF but yet it performs better. Its fluid mechanics my friend, what seems to make sense if often not the case.

[honda250r]

Originally Posted by eviltwin

with vforce you have double stacked reeds which offer alot more flow velocity and they are carbon fiber for response ..now on the duncan they are epoxy and open on the sides looks neat!.. but theres a certian resistance (<for lack of a better word)thats deisgned for the valve .might thin k of it as pistons go up and down not side to side just another reason duncan should stick to making doughnuts

Ya i get what you mean

[SHOWTIME]

i have a thread on here with a graph
of the vforce vrs the pyramid. the vforce
kicks the pyramids ass. the graph shows
a comparison at multiple rpm ranges.
the numbers speak for them self. i will
post it if i find it.