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Velocity Stack
Posted: Tue Feb 12, 2008 3:06 pm
by nirtynirt
Does anyone know a formula to determine the length of the velocity stack to make an engine constantly run at 5000 RPM
Posted: Tue Feb 12, 2008 5:23 pm
by Mk1rocco
Do you mean you want the engine to make peak power at 5000rpm? The important thing is the length of the entire intake tract from the valve to the end of the of the velocity stacks. Anyways, here are a couple of links that may help you out.
http://www.bgsoflex.com/intakeln.html
Intake_Design_v1_8
Posted: Wed Feb 13, 2008 4:30 am
by nirtynirt
thanks for the websites they really help, just ot let you know that this information is for fuel injecting a 10HP briggs and stratton, that is going to run throttleless, eventually the engine will run on hydrogen so thats why i need to know what size velocity stack i need.
Actually we are going to run the engine at a constant 5000RPM
Posted: Wed Feb 13, 2008 7:14 am
by Mk1rocco
Oh okay, that's different! Without a throttle, the speed the engine runs at will vary with the loading so you'll probably need to experiment with length and especially diameter to get the speed you need at the loading you want. And I think the optimal setting for you would likely change if you change fuels.