Air consumption of a 700 triple

[adrianm]

So im working on an idea of a supercharger for my 02 mountain max 700, and im trying to figure out how much air this engine can "consume".
I have done some math and am wondering if i am going about it the rite way.

So....
we know our engine is 700cc (which is a rounded out figure anyway)
so in 1 revolution i would think 700cc of air is "used" by the engine
so lets say we idle at 1000 RPM

700 x 1000 = 700000 cubic centimeters in a minute at 1000 rpm
translated into cubic feet we are talking 24.72 cf/min @1000rpm


so at 8000 rpm were looking at 197.76 cf/min @8000rpm


so in theory to get any boost would have to be met with a higher volume of air than the numbers i have given along with more fuel.

Does my madeness have any merit here or am i just mad.

 

[TreeThrasher]

Well there are some serious issues with a supercharger on two stroke, but you can research those yourself.

As far as your calculations, the concept is good but you have to calc the amount of mix that is being blown right through the motor (due to intake/exhaust port overlap) and the pipe not getting it back in the motor.

 

[nytrocharged]

good luck wont work i have seen a 700 turbo befor worked good but blew up goin up trail if u wona turbo ur ol mountain max find ur self a mounatinmax 600 twin an turbo it works very very well

 

[HDEMWET]

good idea, just remember to pull out your reeds as they will "snuff" with the extra pressure and you'll end up with a blown engine.

 

[MRFUSION]

I did this exact project with a Eaton roots style supercharger driven off the rewind side of engine. I have about 6 pages of calculations on this engine at my shop if you need. You can PM for more info. I have a whole binder that I put together for this project about 8 years ago. I have the CFM figured and pressure ratios at altitude for that engine. Again like said above you have very limited port timing on this engine so I had to build an adjustable bolt in the exhaust to build some back pressure to keep all the charge from blowing right through. I did completely remove my reeds from this unit too, it run just fine. It would pull super hard then fall flat on top. Cool project, did lots of math too. Shad