Liquid Propane EFI Injection - Anyone Done It?
I'm seriously considering a liquid propane injected engine for my next project.
Has anyone here played with this type of injection or seen any of the systems that are now commercially available?
Propane mixers and/or propane carburetors are a different breed; not interested in those.
I'm talking about a port-injected engine that sprays liquid propane out of the fuel injectors. This is a new type of propane injection that is extremely attractive from a performance perspective. Not only does propane offer 100 motor octane, but it also offers chemical intercooler properties (liquid propane absorbs heat when evaporated...it's a refrigerant, like nitrous oxide). There are systems like this now being demo'd by several companies across the US.
I'm thinking of making a high performance version for the rod market. Efficient operation at 12.7:1 CR or greater should be possible; and given the current state of our gasoline prices...propane is rapidly becoming an attractive option. Additionally, the emissions from the combustion of propane are so clean...you'd probably pass a sniffer test without cats.
This is also extremely attractive for power-adder vehicles. Existing engines and/or parts makes it simple to build a 9 or 10:1 engine these days, and with propane as the high octane fuel / intercooler; it's just asking for a turbo/blower power adder.
-No fuel pump needed, only a bottle heater/control solution.
-100 motor octane
-Chemical intercooler properties
-Becoming cost effective
-Far less likely to degrade in quality
-Far less likely to rise in cost as fast as gasoline
-Takes slightly more fuel volume per horsepower.
-New technology / bleeding edge.
-Refueling not as convenient.
Anyway, there's a lot of smart people on these forums. If anyone has had any first-hand experience with any of these systems and/or has any inside information about how to obtain parts (specifically, the coaxial insulated fuel line stuff), I'd be very interested to see some of those parts and/or hear about the more challenging parts of this system.
I do cryogenic related engineering by day for Boston Scientific. I have a pretty good idea what needs to happen to keep the propane in liquid phase right up to the injector nozzle. What I'm not sure about is what happens next..will the injectors freeze/stick? Do the lines ice over? Will I need a purge cycle or a recirc pump to prime the lines before startup or possibly a continuous recirc pump to keep the lines from boiling? These are all problem areas I'm sure...I'd be curious to know how these issues have been solved. I've contacted Bi-Phase (leader in this technology) and they won't provide details, even under NDA.
Anyway, I think it would be extremely interesting to do this. Then, eventually convert the cobra over to Propane and certify it as a clean energy vehicle in California. Imagine a 1000hp Cobra with a clean energy sticker on it driving in the commuter lane. LOL; that'd be news.