We showed a 14% gain in HP and almost 9% (8.8%) gain in torque at the factory with a taper bore 40/38mm. The venturi can somewhat be described as a keyhole design, however there is much more at work than just a big hole and little hole, annular disposition, laminar flow, etc. The taper bore is simply a 40mm front body attached to a full 38mm rear body. This again amplifies the signal to the metering rod with a little trade off in mass flow. The 40/38 moved the torque over to the left of the best 36mm Keihin tests, built power sooner and carried it longer past peak than the best 38mm settings. A straight 40mm made more power yet on top, but with a fair trade off on the bottom.

Corey

Did I miss the dyno curves? Just asking, because some guys will say that without pictures it never happened :D

I don't normally publish dyno information simply for the reason that some people don't know what they are looking at, what a dyno is intended for and it creates a lot of confusion. Anyway....:rolleyes:

Corey

I have no intention of giving this away for the sake of selling carburetors. Trying to make people aware of what it is we are dealing with here and hopefully wake them up to the value. Thank you for your comments.

Corey

Projected costs are in the $350-$400 range for the 36-40mm sizes. $425 to $450 for the side pull TPS 40-44mm sizes and $275-$325 for the 20-27mm sizes. Other sizes coming and yes taperbores (usually around $100 more than a standard bore because of additional machining). Word this week sounds like we may be in production sooner than we thought. Possibly early summer 2013 unless all of us can convince an OEM to sign some purchase orders:cool:.

Corey

A taper-bore it is then ... meaty torque on the bottom and into the mid, then healthy over-run up top.

Funny that the Euro dynos still record data in CVs ...

Looks like a super product - can't wait to bolt one on.

Thats a long wait , there are 2 of us here in the uk that are interested if thats any help:D , im sure once a few guys have them up and running and see how well they work they will sell like hot cakes :D

Agreed. The billet ones are available now....just think you could be one of the first one's to have it over there. :D

Corey

Ah, for sure. Well volume directs pricing, and with input from you we better understand our audience and what we hope to achieve in this market. Also nice to see a forum remain cognizant about facts and reality, pretty rare indeed.

Corey

Yes. http://powerapt.com

Corey