Superchargers increase engine displacement by forcing air in...
Could you decrease engine displacement by running a vacuum instead? The crankcase might need to be under a vacuum, too.
It would be intended as a fuel efficiency device for larger motors. Idling and cruising would benefit, yes?
The primary issue would be adjusting the fuel air mixture on the road when switching modes.
You could suck out burning gas causing your car to light on fire too fag
>superchargers increase engine displacement
>Could you decrease engine displacement by running a vacuum instead?
No, your point is that you want to reduce the amount of air going in. Using a vacuum wouldn't be very effective. Instead you could just make sure the throttle doesn't open as much so it allows less air in. Most manufacturers already do this with their drive-by-wire systems.
This.
Many racing engines run restrictor plates for the same effect.
I thought you could do this with the throttle body, but I bet with the crankcase under vacuum it would be very effective.
I figured motors would do something like this already because its so simple.
Effectively, yes, turbos and superchargers do this. So I was wondering about manipulating pressure to decrease displacement. Kinda like how Chevy came up with the idea to shut off cylinders to save fuel in V8s, except a much simpler solution.
You know engines run on explosions and fire, right?
you're making so many assumptions that this post is hard to read.
no, you can't decrease engine displacement by running a vacuum. you can run a restrictor plate to limit the amount of air allowed through the throttle body but that would be it.
and the crankcase is typically under a vacuum anyways.
nutterracingengines.com
but yeah, all you can do is run a restrictor plate, and even if you had a 'restrictor on demand' system to limit the amount of air, you would have to be specific on when you could use it because people would just push down the gas pedal farther and use more fuel anyways
>Could you decrease engine displacement by running a vacuum instead?
Yes, it's called closing the throttle. Are you retarded?
Turbos and superchargers don't increase engine displacement. Every cycle of the engine displaces the same amount of volume with boost or not. Forced induction increases the volumetric efficiency of that displacement.
I'm not necessarily making assumptions as much as vague statements.
Yes, if you run a crankcase vacuum system and keep it under a strong vacuum and you restrict the airflow the engine will run on a vacuum(running on less than standard atmospheric pressure) meaning that it will basically decrease displacement.
What I'm asking is how far can you take this idea? Can you in simple terms turn a V8 into something that runs more like a V6 or V4? Like having to run at 2k-3k rpm on the highway instead of less than 2k for cruising speed? Trade off RPMs for fuel under certain circumstances.
I think what I'm saying is more complicated than manipulation of the throttle.
Engine displacement is measured in volume. Turbos and superchargers manipulate that volume for power. Technically you're right.
I'm talking about manipulating the volume to achieve fuel efficiency.