All the non-DYI-EFI crap I've put up here

[Clare Snyder]

>What I would like to do and am working out is correctly called a Bi-Fuel system
>(i.e. using two fuels at the same time) rather than a Dual Fuel (using either
>or system).
>
>Fuel A  Timed port injection Vapor Propane.  A poster ran Methane on a 75 lb
>per hour Alcohol Injector at 80 psi and got 19 lbs per hour.  Another mentioned
>Big Block Chevy Injectors run 75 lbs per hour and handle reasonable pressure. 
>Using a dry vapor regulator off the top of the tank (still looking - any clues)
>will plumb the regulated vapor to the injectors.  Looking for 15 to 20 lbs per
>hour. Getting info on any number of TPI EFI systems that can be used.  Start,
>run, idle, low - mid range on Propane Vapor.
>
>Fuel A prime.  Liquid Propane.  Think NOS spray bar or direct port.  Will run
>line from bottom (liquid) line unregulated to NOS type Gas Solenoid at spray
>bar. Sense RPM, throttle position and PW of injector (and other depending on
>final EFI selection) to determine turnon.  Measure Tank Pressure and apply
>curve for volume thru orifice correction.  Grossly adjust EFI - finely regulate
>thru Oxygen.
>EFI selected must run closed loop at WOT as with propane, richening past stoich
>RAISES temp's to meltdown range - not runs cooler.  Got to error on lean side. 
>Each spray bar step will be power of two flowed so step two flows twice of step
>one and strep three flows twice of step two.  This gives me 8 points with the
>step
>approximately equal between the points.  May only wind up with 2 as this covers
>a wide range with reasonable cost.
>
>What I get at this point is an off the shelf injection system that is tweakable
>by a Chris Johnson or other chip or programming package to be just happy fine
>on Propane.  All the controllability of TPI with SIMPLE CIS for taking
>advantage of the high latent heat of evaporation.
>
>Fuel B will be unleaded pump gas to use as a cheap extender fuel.  Gasoline is
>cheaper than propane in most parts of the country 


And what country are you in??????
Here in Ontario Canada, propane is something about .27 per litre, and 87
octane unleaded is currently just a tad under .60, was .65 a week ago.