Originally Posted by stovie
Sorry I meant air/fuel instead of cr, I fixed it so there shouldn't be anymore confusion there(I hope!)
Yes the jeep is running wide open throttle! It's suppose to be like that in my experiment! I'm seeing what fuel economy and power I get with the air always being at full charge and the fuel being the only thing that's variable like a diesel. Like I said before I believe that the engines we have now are running way to rich!! I believe the air/fuel ratio of a car should be something more along the lines of 145-1 not 14.5-1!! Or basically cr*14.5=proper air/fuel ratio !
The stoichiometric air fuel ratio for gasoline is about 14.7:1. That's the point at which there is just enough oxygen in the mix to combine with all the carbon and hydrogen atoms (in a simplified model) in gasoline. If you more air than that you have extra oxygen sitting around doing nothing and your power drops off, oxides of nitrogen increase, and you start getting lean misfires. Plenty of people including the OEMs tried running super lean engines (Lean Burn) in the late 70s and early 80s because of the gasoline crisis but nothing good ever came of it.
The power to turn the engine comes from the reaction of air and fuel. Because of this you can think of power in terms of fuel volume, i.e. 40 horsepower is equal to 0.2 lbs/hr (probably not accurate but you get the idea). Adding more air doesn't get you more power once all the fuel is burned. Keeping the throttle open reduces pumping losses but the amount of power you lose going beyond stoichiometric is greater than what you save.
Propane has a stoichiometric ratio of about 15.6:1 but commercial propane is a mix of propane, methane, and butane. The actual ratio for any given tank of propane varies a bit.
I like what you are doing. This kind of experimentation is awesome and I am not trying to discourage you. Keep us updated.