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I think I may have found my problem with the
pressure regulator. Seen below (the Boost Adjustable one is the one I
use). In the description they mention are adjustable from 36-45 psi with a
flow rate of 9.2-10.5 gal/hr. I presume that means the return rate
flow or if they mean the engine fuel used flow rate then clearly it is
under-capacity to handle our rotary fuel flow.
The Pump I use (see below) is rated at
45 gal/hr at 40 psi. My nominal fuel flow at cruise is 7-8 gph. If
my logic is correct that would mean the pressure regulator would need to dump
the unused flow of 45-8 = 37 gal/hour. Yet, it seems that the regulator
unit will only flow a max of 10.5 gal/hr. Is a return of 10.5 gal/hr
sufficient to keep the pressure at 40 psi while using 8 gal/hr?? In fact,
would that return rate be sufficient to respond to manifold pressure
variations? I would not think so - but would like to hear what
others may have as an opinion or knowledge on the topic.
Thanks
Ed
Fuel Pressure Regulators
Maintaining
accurate fuel system pressure on any multiport EFI system is crucial to
performance. MSD’s Adjustable Fuel Pressure Regulators allow you to fine tune
the fuel pressure to meet the demands of your engine and injection system. Both
Regulators are adjustable from 36-45 psi with a flow rate of 9.2-10.5 gal/hr.
The inlet and outlets are 5/16” and a jam nut is supplied for special threads on
the bottom to ease mounting to a bracket. These rugged Regulators are free
standing so they don’t have to be mounted directly to a fuel rail and can be
installed in any position. Fuel pressure is set with an adjusting bolt and is
locked in position with a locking nut.
PN
MSD2220
Boost Adjustable
This Regulator is designed for turbo or
supercharged engines. As boost pressure increases, more fuel is required by the
engine. This regulator features a boost reference circuit that adds more fuel in
relation to boost pressure.
Boost/Fuel Pressure Regulator
PN
MSD2222
High Pressure Electric Fuel
Pump
 Multiport EFI systems require a stable fuel supply
to maintain best performance throughout the engine’s rpm range. This high
pressure and high flow Fuel Pump features a roller vane pump mechanism which is
extremely resistant to clogging and jamming. The pump mounts in-line (out of the
fuel tank) with two supplied cushioned clamps for a quick and sturdy
installation. The nipple inlet is 3/8” with a 5/16” outlet. The wire terminals
feature brass studs for secure connections. Made in the USA, the pump is ideal
for use as a “booster” for nitrous oxide applications, or as a stand alone pump
for multiport EFI systems on engines up to approximately 500 HP. Capable of 43
gph at 40 psi/162l/h.
PN MSD2225
MSD2220.jpg
MSD2222.jpg
MSD2225.jpg
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