Supercharger/Turbo w/ a twist please

[Billiardbrawler]

Ya know, I was wondering...since any forced induction system forces air
into the piston, the piston doesn't have to work to "suck" the air in...that job is done for it.

Why not have "forced out ..duction???...what I mean is, if we make the pistons job easier by providing the intake air for it...why not evacuate that air on the backside?...have a turbo siphoning the exaust out of the piston chamber...sucking that air out so the piston doesn't have to work to push it out?....This way, the only work the piston does is provide the power stroke....everything else is done for the lazy bastered!!!!

Can this concept work?

[Tom @ Fast Forward]

One of my favorite subjects. Suction vs. pressure.

If you had the world's larges vacuum pump with a million HP motor, the best it could do is suck down 14.7PSI. So, if it could handle the air flow and do it's job, the best you could make is a "boost" (so to speak) of 14.7PSI. In practical terms, you would probably be hard pressed to do 5PSI and fit a big enough suction pump to handle the required SCFM and still fit under the hood. The size gets pretty big in a hurry when. Vacuum pumps are typically designed to make vacuum levels with low levels of flow. A compressor, on the other hand, could make 100's of PSI and 1000's of SCFM air flow. The Eaton, MP62, for example has no problem making 15PSI boost and still move enough air for 300WHP (~350 CHP). I would have to do the math and I am way too tired after 2100 miles in 35 hours BUT, I believe it is around 500SCFM of air for 350 CHP. A vacuum pump good for 500 SCFM of air and 20" Hg (~10 PSI) would be pretty good size.