Direct Injection?

[NVMYVPR]

Ok, I understand direct injection for the fuel but what about a twin nozzle for fuel and air? If my understanding is correct, and I may be suspect here, but it seems you could eliminate the intake valve altogether and likely then entire intake plenum. Obviously it would take a pressurized air system and a lot of computing power but would this be feasible or am I off the mark here?


Craig,

 

[Allan]

uh........................no.

 

[AZTVR]

Depends on what definition of feasible that you are using. "Capable of being done?" Then probably yes. I think that the problem to be overcome would be how to get the volume of air needed into the chamber. You would either have to run a compressor to compress ambient air in order to inject it, or carry a storage tank. "Reasonable?" Probably not. I doubt that the efficiency of compressors is very good, and tanks full of air take up lots of space. I don't see it being anything that would be practical. Of course, Mr. Benz probably also heard that kind of stuff from his buddies down at the pub.

 

[NVMYVPR]

So if the intake plenum is your "pressurize air storage tank" then the question is what volume of air would the tank have to be able to have on hand to keep up with the demand for air being injected. Size of tank vs compressor capacity.

Allan, why not? 50 years ago would it have not been the same issue as directly injecting fuel?

 

[Allan]

14.7 parts of air to 1 part of fuel ...by weight. ...........8.4 liters displacement, .......means that at 100% volumetric efficiency, the motor will consume 8.4 liters of air/fuel mixure every 2 crankshaft revolutions. -think about 5000 rpm or what ever. I don't think any 'high pressure air nozzle' spraying into the combustion chamber is gonna fill the cylinders at all, let alone better than a 2 inch+ intake valve thats open a half inch at a time. If N.A. is not enough air, we have turbos and blowers, or NOS.

 

[speedracervr4]

Yea buy a compressor...either Kenne Bell or Paxton. LOL

 

[Allan]

Yea buy a compressor...either Kenne Bell or Paxton. LOL

There you go. Those things will pack air into the cylinders and get above 100% volumetric efficiency (killer boost) -and the engine will still use the intake valves.

 

[Allan]

I guess we could re-design the Viper V10 without intake valves.......-as a 2-cycle engine. That way it'll rev higher as well. But we'll have to mix our gas instead of just using straight from the pump.

 

[Allan]

If we go the 2-cycle route, we should also do away with that stupid idea of the electric starter. We need to figure out a way to revert back to some sort of pull-start cord, or manual crank lever like the old school Model-T. .......or just always park on a hill so that you can get a good running coast to pop the clutch to start it.