In my never ending tinkering and goofing off, I decided that it would be neat to try propane on my 'budget' race car. I have several cars and this one is the beater of the group. It is a '69 mustang with a carburated 302. Not very fast. My plot was to use an old style aircleaner, the kind that seals up and has a squarish air tube coming off of it. The air tube would go to a long intake pipe getting fresh air from outside the engine compartment. Next put a fitting in the side of the aircleaner and run to a propane tank in the trunk. It would be metered with a solinoid to turn it on and off. The flow can be controlled by nitrous nozzels or the size of the fitting. Depends on how much propane to use I guess. No changes are planned for the fuel system.
Before I get slammed for this idea, it is just for fun! This same car is going to get a lethal nitrious dose at the track later this summer...
It may add power for a short time before the engine melts down. I won't get all technical but when using nitrous oxide the molecules of n20 break down in the combustion chamber giving up oxygen to help combustion and nitrogen which effectively cools the charge, this is why you use n20 instead of pure oxygen. If you use propane you wouldn't get any cooling benefit and a meltdown would most likely occur, however if you do it please make some video of it, it would be quiet funny to watch but be careful I don't really want to see you blow your head off.
I'll be careful... I have been running a bigblock '69 mustang with a 175 shot of nitrous for a few years now and managed to keep from having any disasters, I guess the propane is another kind of danger though being highly flammable. After thinking about it some perhaps I will use a nitrous plate for the propane.
And pictures will be taken! Video too if anyone is brave enough to film it!
This is just my opinion but, I don't think it will work to simply add propane as a power-adder.
In other words, you will be putting fuel on top of fuel and more oxygen will be needed to burn the additional fuel. So, unless you were planning to turbo charge or supercharge, I believe the end result will be an over-rich condition.
Isn't propane injection used on diesels? Like was said above, adding a gaseous fuel to the incoming air stream will just displace air that could be burning in the cylinders, hurting volumetric efficiency and causing a rich condition.