Revmaster has been manufacturing
the RevFlow series injector carburetor since 1981.
The major components of the RevFlow are precision
die cast, not machined from bar stock. The die
casting process allows for many intricate features
to be cast in, thus reducing manufacturing costs.
The injector unit incorporates a once-patented
variable jet for fuel metering and a guillotine
slide which controls the air flow. The two parts
work in unison, thus providing the engine with
the proper fuel/air mixture.
The fuel metering needle
is ground with a flat tapered side which gives
it an asymmetrical shape. The needle is attached
to the slide and is allowed to float so it is
self-aligning when inserted into the fuel nozzle.
The head of the needle is configured so it cannot
rotate while in service and is spring-loaded so
the fuel mixture can be fine-tuned during the
initial installation via a slotted adjusting screw.
Several throat sizes and needle configurations
are available.
The guillotine slide
is actuated by a wheel and leaf spring that opens
and closes to the throat opening when the wheel
is rotated via the control arm. The slide has
four flutes that guide it very precisely on several
surfaces so the transition from idle to full power
is without hesitation.
When the slide is in
wide-open position, there are no other obstructions
in the way of the air flow except for the needle,
thus allowing for much greater air flow than with
throttle bodies which have typical butterfly valves.
The flat side of the needle is oriented towards
the engine and produces a low-pressure on the
back side which in turn causes fuel to flow in
relation to the air flow.
This characteristic has
altitude compensation benefits due to the variance
in air density at higher altitudes. In order to
manually control the mixture, the injector unit
is equipped with a manual mixture control and
idle cutoff. Besides controlling the mixture,
this system will allow the fuel to be cut off
at the nozzle, thus eliminating fuel leakage from
the fuel line. Then, on restart, the fuel is at
the nozzle for priming and starting.
The unit is equipped
with two control arms; one for throttle and one
for mixture cutoff. They require vernier type
controls with at least 3.5" travel with solid
wire ends. Cable housings are connected to the
injector body via cable housing attach points.
This eliminates any movement in the cable housing
which can cause erratic control problems. The
wire ends of the controls are secured at the control
arms with barrel clamps. Next...
