Author Topic: intake/crankcase stuff  (Read 2031 times)

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Offline 1manband

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Re: intake/crankcase stuff
« Reply #20 on: March 26, 2016, 07:16:53 am »
Just so happens I am a guitar player.   I do find this all very interesting but it is more about the theory for me than the math.   
When I studied electronics and we were discussing resonant frequencies and showing them on a scope, I don't remember but can there be more than
one resonant frequency or as in the case of a guitar more than one harmonic.   Its been 40 years since I studied that stuff. 

But hey I still find it interesting to read.   I do not leisure read and only like to read tech stuff.   

What I was really interested in seeing was what your finding were and what effect porting a saw had on the pressure waves for the intake.   To me it looks like it may help it more than hurt it.

same here.

imo, at this point, the potential benefit of using this concept is debatable in a saw motor.  i am not saying that it does not work, but that it most likely has already been incorporated in the motor when it was designed at the factory for a particular rpm.

in example, looking at my jonsereds 52.  the specs i found say that maximum HP happens at 8300 rpm. 
running the numbers, came up with 8900 rpm for the resonant rpm.

the formula is an approximation, also has some generalizations, not taking in temperature, heat, pressure, pipe end corrections, etc.   even with all that, is roughly 600 rpm off.  maybe it is a wash?  don't know.  not sure if this is the rpm to shoot for anyway.

would tend to think, that in order to truly maximize the potential of this concept, the porting goal would need to be made for a specific rpm in mind.
since, the intake hole size is also affecting the "tuning" of the case.

even reducing the case volume a good bit, has a small effect on the formula results like rpm for the numbers i ran.

do believe, that everything can work together to achieve the greatest benefit, and has to be balanced to work well.

i enjoy reading the tech stuff, and wondering if it can be applied to help these tiny motors.  usually my interest gets the better of me, and spend time
chasing my tail or running into dead ends.  but, hope folks could at least learn from my mistakes.
hiatus

 

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