Ok so I don't have any pics, and I haven't rode it yet. But I was working on my bike at my friends machine shop and was given the idea to thread the inside of my intake, so I did. The thought is that it will create a little vortex and increase the amount of flow it can handle. At very least it will aid in the mixing allowing for more efficient scavenging and ignition. Has anyone else tried this?
your intake is one step away from drinkability.
I'd think it would be awesome if it worked, but there's more physics at play there than I would care to calculate. Smooth intake = fast flow as far as I can imagine.
It would have to be a smooth curve and very little at that. maybe like a 100mm-200mm pitch ?
http://www.buildsolarpanels.me/does-the-intake-vortex-better-your-gas-mileage/
You could also put a magnet on your fuel line while you're in there.
this thread is lolz
The whole air/fuel mix thing... isn't that supposed to take place at the venturi in the throat of the carb or in the injectors? Wouldn't a threaded venturi or throat be more effective?
The Idea of changing the surface conditions of your intake and getting more flow is a nice idea. Unfortunately, a bunch of little vortexes will most likely increase boundary layer and turbulence which will increase pressure drop and make things worse. Then again, the flow may not be fast enough to even make any of these factors matter. 4 years of Mechanical Engineering has me convinced that the best way to spend your time and money is to make an intake that has a nice gentle sweep, and is the appropriate length for your engine as described by Jennings and Bell. The surface roughness from the inside of the pipe is plenty good enough for mixing. All that being said, you should still try it. Good luck!
El-P-D is correct. Threads will just give a higher Reynold's number, decreasing the flow rate necessary for flow separation and ultimately reducing the amount of air the pipe can flow. The effect is likely to be tiny, so don't sweat it if it looks cool and confuses people.
what number am I giving?
number of handjobs divided by your weight times the gas constant (r)
oh yeah, weight and R have to be in the same units, handjobs are dimensionless
they do a process on mustangs and other cars called screw hone the intake runners. what it does exactly I don`t know but it sounds like what you are trying to do.
i thought about this too, and yeah i thought that too much turbulence would cause pressure issuses so, the pitch would have to be more like the rifling in a gun barrel, nice and swoopy with a slow curve, would cause enough turbulence to help the mix, but not too much to cause issues. now i just need to see if i can get a gunsmith to rifle my intake to test my theory
I'd say if anything were to help, it would be something less like threads and more like really slow and smooth spiraled curves. Not sharp edges, but something to gently guide the airflow into a slow spiral.
That is, if this were a viable option. You'd have to cast it like that or something. I wish I could illustrate what I mean. Like, imagine if you took your intake and just twisted the whole thing to make a spiral in it.
Also, I agree with the "gentle sweep." Seems like the most direct path to your engine from your carb would give the most flow. Shortest distance between two points it a straight line.
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