"Peter Hill" wrote in message


Not to sure about the current status of Bi-Phase but they claim 5400
systems installed (2001-2002?).
http://www.ccities.doe.gov/conferenc...ch_biphase.pdf
Despite the name Bi-Phase is a 100% LPG liquid phase injection system
- the petrol fuel system (tank, injectors, fuel rail etc) is not
fitted. The LPG injectors are fitted in the vacant holes on the
manifold. Overall cost ex works should be not a lot more than the OEM
petrol system, injectors and ECU should be about same cost, the fuel
rail, double walled fuel line and tank are higher cost items (maybe
double) but some saving can be made by not having to fit a separate
return line, carbon canister, vapour purge system and check valves in
fuel vapour lines. As the petrol system is never fitted would it be
eligible for a power shift grant?

Bi-Phase has approximatly 3000 1999-2003 fuel injected Schwan's trucks
running around America. (GMC 7.4L and 8.1L) and many Ford V10's running
around in Mexico.
Bi-Phase uses a refrigerated fuel injector and fuel line (hose within a
hose) to
keep the injector from getting too hot. They also have a composite injector
body to insulate them.
The tank is custom built and extreamly expensive. It has an internal fuel
pump
with baffels. There is an "LPDM" liquid propane delivery module with
electric solenoids for fuel feed-return in the loop that bolts onto the end
of the tank (like an man hole cover).
When the system stops, the liquid is driven back to the tank by engine
heat, so
the vehicle must run a purge cycle evey time the unit is shut off for any
length of time.
If the system does not purge, the vehicle will not start, as it only has
1/270th of the fuel
nessisary to run (I know this from experiance).
The hose within a hose idea has liquid propane supplied by a fuel pump in
the tank
running through the center hose. The injector has a restriction, and
pressure differential
at the injector itself. The liquid is injected, and the remainder is
returned to the tank
to a condenser unit. The pressure differance at the injector cools the
injector, and the
liquid coming to the injector.
The cool thing about it, is the system runs off of the stock PCM. No
reflash is needed
after the system is installed. The long term fuel trim runs happily
about -18 or so.
The only mod to the sensors, is a coolant sensor that reads a little warm
in cold days.
This keeps the system from flooding the engine, as propane doesn't need the
same
enrichment as gasoline (petrol)...

Or so I've heard...

Biker_Bry