Dual fuel PFI rails....

[Kevin Yachimec]

Correct me if I'm wrong but don't top fuel nitromethane powered motors
(funny cars) start on alcohol (methanol) then before they enter the water
box they which over to the nitromethane.  I'm not sure what type of valve
they use to which over but I believe they share the same set of injectors.
I realize that they don't which back to the alcohol until the motor is
started again but maybe some of the system design could be used for a street
system.
I think the choice of fuels would dictate the lay out of the system.  If you
were just using pump gas and some high octane race fuel then alittle mixing
of the two fuels shouldn't matter and injector sizing shouldn't be a
problem.  If pump gas and alcohol is used then the system would have to have
two sets of injectors or different two fuel regulators.  Alcohol would have
to be injected in to the motor at double the rate roughly, and doubling the
prssure doesn't double the amount flow.  If the injectors were sized for the
alcohol then I dubt that you could shorten the injector pulsewidth enough to
have a stable idle.
These are just some of the problems that such a system would have.

Regards...

Kevin Yachimec
Cybertech Automation Inc.
Edmonton Alberta Canada
keviny at cybertech.ca