Joined Mar 2006
74 Posts | 2+
Spokane, WA USA
Great pictures, I'm looking forward to your dyno results. I finally had a look inside my airbox and fabbed a 60mm. (2.4 in.) extension out of plastic pipe and fit it tight it into the air inlet hole. There's plenty of room inside the 570 airbox. It doesn't have a wide bellmouth, but I was able to camfer the inlet to smooth the airflow. It will also keep any water and debris that makes it inside the airbox from falling into the intake.
So far, I like it. My butt dyno says it really rips now at 5000 rpm, but it did pretty much anyway.
So far, I like it. My butt dyno says it really rips now at 5000 rpm, but it did pretty much anyway.
I have this one I would like to part with:
$45 + actual shipping costs
I had it on my 570 for 1 hour is all, part is like new.
PM me if you are interested.
$45 + actual shipping costs
I had it on my 570 for 1 hour is all, part is like new.
PM me if you are interested.
For once I tend to disagree, I dont think this mod will help power.
Im thinking and I dont know so dont throw a swing at me ok
My 2c is length of the stack needs to be ok and from then on you can tune the tq peaks up or down, thats it.
Humans like a flare, but an engine cant see
Im thinking and I dont know so dont throw a swing at me ok
My 2c is length of the stack needs to be ok and from then on you can tune the tq peaks up or down, thats it.
Humans like a flare, but an engine cant see
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Joined Mar 2006
74 Posts | 2+
Spokane, WA USA
Take a look at page 62 of his Thesis. It is a graph of engine speed vs. increased/decreased power of various intake lengths compared to stock. You are right in that length does shift peak power, but it also can increase or decrease power because of the phase shift of the reflected wave either amplifying or cancelling the primary wave.
He likes the 120 mm extension because his student race car competes at 8000 rpm. I like 60 mm because it adds more mid-range. If you go even shorter than stock, it loses power all the way to near red-line. The net effect at any rpm is not intuitive. It needs to be modeled and tested.
He likes the 120 mm extension because his student race car competes at 8000 rpm. I like 60 mm because it adds more mid-range. If you go even shorter than stock, it loses power all the way to near red-line. The net effect at any rpm is not intuitive. It needs to be modeled and tested.
Joined Oct 2003
955 Posts | 1K+
Sweden
Intake length is from valve seat to where the bellmouth radius begins. For max top power, tuning for the second pulse is the best way (really tall intakes). For good top and wider range, the 3rd pulse is recommended. equally important is how the intake area changes through the intake, and how the area at the bellmouth corresponds to the mantle area at the valves at max lift. After you have done all calculations, hit the dyno for the final adjustments that makes the effort count!
Joined Nov 2012
2K Posts | 821+
Iceland
True! - From what limited accoustics I know, then yes, resonances and reflections in the airbox will matter but can be considered too complex or diffuse to consider in most cases, but the simple (ish) cylinder is a system which obeys known rules somewhat well enough for some to consider it worthwhile to take it as a parameter for optimising the overall system
The stack is the flute, the airbox is the little cardboard box around your head when you're playing it I guess.
Or not
I'm very much an amateur.yeah, when you open the throttle completely, nothing stops the wave at the throttle body. So when the valve closes the pressure wave goes up to the radius of the velocity stack. Having a large radius up there is very important for airflow too and should not be neglected.
you could loose as much as 15% of airflof (power) by having a sharp edge at the end instead of a velocity stack
you could loose as much as 15% of airflof (power) by having a sharp edge at the end instead of a velocity stack
To add to that I did tests on a KX450 and the same result. Im not sure why the mx engines wont respond to that, thinking its being masked by some other factor, ie something else is bad enough.
Where it will mattter is on Ducati twins of which I have extensive tuning experience, just ask and I will reveal my findings, as its out of scope on a berg forum per definition.
Where it will mattter is on Ducati twins of which I have extensive tuning experience, just ask and I will reveal my findings, as its out of scope on a berg forum per definition.
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