has anyone pondered the idea of using a negative supercharging system on thier rotary, from what i understand it simply works by having the charger at the exhuast end, and instead of forcing air in it's pulling out the exhuast hasses out really fast (and therfore sucking more fresh air in really fast).

technically this wouldn't work as well on a stock engine although a Peripheral Port with a big overlap i think it could make a massive difference.

and another point it may help with emmisions as when you reach overlap you will pull air right through the overlap and down the exhaust making it seem like you have cleaner exhust as it has more unburnt oxygen in it.... or on the otherhand you might get 5foot fireballs shooting out you exhaust either way it's a plus.

 

Has some one told you that exists? If it does, burn the people who make it. That would be an incredibile waste of money.

 

How do you figure it would make the engine intake cycle any faster? Sure you get rid of backpressure, but that only frees so much hp, would would probably be exactly offset by the power it took to run the damn thing.

 

Oooh.. aeon flux. Havent seen anyhting relating to that in a while. Good avvie, tweaked

 

you arn't trying to make the intake cycle any faster, youa re creating a vacume or area of less preasure and this has to be filled so air rushes in, therefore if done correctly can create forced induction.

 

What are you talking aobut? Sure you'll create a vacuum.. on the exhaust stroke.. but that wont matter because the volume of the chamber goes to nearly zero before the intake stroke anyway. The combustion chamber creates it's own vacuum when it expands in volume. That's how it sucks in a new intake charge. Sucking out the exhaust would have nearly no effect on this. "Negative supercharging" wouldnt have any beneficial effects except for making it easier for the engine to turn: it wont have to work against pushing the exhaust out. But powering that mechanism would negate any benefeits of it.

 

Please define "vacuum" with respect to pressure, Grasshopper, and you will see the error of your ways.

 

The point is it works better on high overlap engines. Two strokes often use this system in order to run a turbo. Don't know about a four stroke, though.....


FYI: One of the big turbo books mentions this. (Turbocharging or Maximum Boost)

 

Hmmm. Using your noodles. That's great. The object of this unit would be ensuring zero back pressure or a vacuum (meaning pressure meter between engine and charger unit would register negative figures). Here are a couple of key issues to overcome:
1)-The resulting HP gained by this would have to be noticeably greater than the amount of HP used to drive this unit.
2)- This unit would have to stand up to the extreme exhaust temperatures. Looks like you will be looking at reverse engineering the turbine housing technology and finding a way to spin it up to optimum speeds.
3)- If no one else already have this design you could give it a name like the Shamrock scavenging unit.

I would just love to be able to say years from now that I was there when you first thought of this and showed some support….

 

I can tell you of a way to ionise the airflow, but the only downside is, it would require around 2kw to run and have any realeffect

search for "Thomas Townsend Brown" on google to find out the basics on the theory before I tell you the implementation....

electrogravitics

 

oh yeah, the point of this would be to make an electronic vacuum with NO moving parts - but the risk of sparkage would make it too dangerous for use in the inlet

fuel + spark = BANG!

 

Actually, there is such a system for piston engines:
http://impulsengine.com/how.htm
but I don't think it'll work at anything but low RPMs. They combine a step header with a special (short) grind cam. I doubt the setup would have any top end at all.

GL

 

Always thinking.........thats good. So what is wrong with turbo's exactly????