It'll pick up low end power.http://www.thumperfaq.com/downloads/JamesNOW!.pdf This is the brand product;http://scaryfastracing.net/
Almost FREE motorcycle carb mod.....
- Thread starter daves66nova
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btw,can you think of an easy mod like this for a Holley carb?
thumpertalk is the BITOG of 4 stroke dirtbikes.
It works on a motorcycle carb because motorcycle carbs have "slide" throttle plate that slides straight up and down. This modification smooths the turbulence at part throttle because the air is hitting the partly closed flat surface of the slide.
Your Holley has a "butterfly" throttle plate that turns to open and allows air to pass to all around the throttle plate. There is no part throttle turbulence from hitting a flat throttle slide like on a slide carburetor.
It works on a motorcycle carb because motorcycle carbs have "slide" throttle plate that slides straight up and down. This modification smooths the turbulence at part throttle because the air is hitting the partly closed flat surface of the slide.
Your Holley has a "butterfly" throttle plate that turns to open and allows air to pass to all around the throttle plate. There is no part throttle turbulence from hitting a flat throttle slide like on a slide carburetor.
Originally Posted By: tom slick
There is no part throttle turbulence from hitting a flat throttle slide like on a slide carburetor.
The throttle shaft might have some.Straight shaft straight.
There is no part throttle turbulence from hitting a flat throttle slide like on a slide carburetor.
The throttle shaft might have some.Straight shaft straight.
This picture explains how it works on a slide carb. The same turbulence doesn't happen with a butterfly valve.
Does it really work? Do they have actual Dyno results. Those Constant velocity carb slides move up and down in relation to the vacuum of the engine which is in rough relation to the position of the piston during the intake stroke. The slide is open the most when the piston is half way up the cylinder: The piston is at it's highest velocity.
That's not a constant velocity carb, it's directly cable operated.
Originally Posted By: Loobed
Does it really work? Do they have actual Dyno results. Those Constant velocity carb slides move up and down in relation to the vacuum of the engine which is in rough relation to the position of the piston during the intake stroke. The slide is open the most when the piston is half way up the cylinder: The piston is at it's highest velocity.
Are you suggesting that the Carb piston moves up and down with every [Engine] piston stroke?
It does not!, the Carb piston is normally fitted with a Damper to smooth such rapid movement.
Would this device work on a Carb (SU type) where the Piston or Slide is very close to the carb intake flange? Would a Tube need to be fabricated? or add it to a Power Horn?
Does it really work? Do they have actual Dyno results. Those Constant velocity carb slides move up and down in relation to the vacuum of the engine which is in rough relation to the position of the piston during the intake stroke. The slide is open the most when the piston is half way up the cylinder: The piston is at it's highest velocity.
Are you suggesting that the Carb piston moves up and down with every [Engine] piston stroke?
It does not!, the Carb piston is normally fitted with a Damper to smooth such rapid movement.
Would this device work on a Carb (SU type) where the Piston or Slide is very close to the carb intake flange? Would a Tube need to be fabricated? or add it to a Power Horn?
There should be a taper on the bottom of the slide.
But there is a difference between air being forced in, vs. air being sucked in naturally. The pictures shows artificially induced forced air.
But there is a difference between air being forced in, vs. air being sucked in naturally. The pictures shows artificially induced forced air.
Originally Posted By: mechtech2
There should be a taper on the bottom of the slide.
But there is a difference between air being forced in, vs. air being sucked in naturally. The pictures shows artificially induced forced air.
Is There??
I don't know, but I would assume that air moving from an area of High pressure to an area of Lower pressure would act more or less the same, the only difference is, that with forced induction, the gradient (or range) would be greater.
There should be a taper on the bottom of the slide.
But there is a difference between air being forced in, vs. air being sucked in naturally. The pictures shows artificially induced forced air.
Is There??
I don't know, but I would assume that air moving from an area of High pressure to an area of Lower pressure would act more or less the same, the only difference is, that with forced induction, the gradient (or range) would be greater.
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