Originally Posted by dougl
The so called snorkel on the R3 seat directs air from the back of the seat through ducts into the filter. Aside from the restriction of the duct, the other restrictive effect is that when the bike is moving forward the engine is pulling against low pressure from behind the bike - the opposite of ram. No one has measured these effects and they could be insignificant. Th R3 Corbin seat pulls air from all around the base of the seat. It is LESS restrictive than stock. Again, I don't know if anyone has actually measured the difference. At some point, someone thought of disconnecting the R3 manifold from the air box and putting a big K&N filter on the tube from the manifold. This seems just like the BC air box replacement. It didn't do squat. The only thing that did do something significant was to rip the R3 manifold off and put a k&n or unifilter on each of the throttle bodies.
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..My T-Bird intake is exactly the same as the R3-- I opened the bottom of the air box to offset any low pressure as you described. The camber of the factory seat is somewhat negated by the rise of the passenger seat and any directing of air by the ridges under the seat were removed so a smooth flow was possible.
I spoke with Corbin and all they had to say was that their seat was built to provide acceptable air flow ! ? They would committ to nothing else nor would they offer a before and after dyno of their seat results ! I do not use Corbin seats on Triumphs !
. Thanks for the info on the R3 air box ! Saves me a lot of search time.............................................. .................