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Oversize 12th July 2019 04:17 PM

Shaftless Throttles
When you’re searching for more power, every little bit helps! Particularly important since the majority of flow is at the centre of a pipe. I’ve already spoken to my guy about doing conversions...

motec 6.9 12th July 2019 04:31 PM

Re: Shaftless Throttles
Bikes solved this years ago with flat slides

abl567 12th July 2019 04:49 PM

Re: Shaftless Throttles
"Particularly important since the majority of flow is at the centre of a pipe"
Only when you have laminar flow, in general air in a pipe or duct travels in a vortex, the air closer to the duct walls has a higher velocity, and lower static pressure while the air in the centre of the vortex is slower but has a higher static pressure. So, a higher MASS of air is delivered in the centre but the air at the extremes gets there quicker. The quicker air can increase power but it's the slower, high mass air that produces torque, and torque talks. Think blowing slowly on a camp fire to help the embers glow as opposed to quick bursts that extinguish the fire.

Styria 12th July 2019 05:49 PM

Re: Shaftless Throttles
I was just thinking which way I would get blown - up or down, slow or fast, what if the massive back pressure is too high and escapes into the atmosphere ? Could be disastrous. Regards Styria

motec 6.9 12th July 2019 09:04 PM

Re: Shaftless Throttles
For your reading material Mark

motec 6.9 12th July 2019 09:08 PM

Re: Shaftless Throttles
And more

Oversize 12th July 2019 11:52 PM

Re: Shaftless Throttles
Interesting reading & the dynanmics of air in enclosed spaces has me intrigued. According to those documents, the butterfly throttle plate is still superior in a street engine & Iíll be exploring the mod soon.

motec 6.9 13th July 2019 08:53 AM

Re: Shaftless Throttles
Figured you would like that bike's have used flat slide carbs first then throttle bodies for years.

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