This is an injector holder for an MSD 50 pound per hour injector.
Needless to say it can be welded to the 2 inch OD tube anywhere
along its length according to your preferences.
If you are looking for 250 HP or more NA you will need at least
a 50 pound per hour injector and a P-port. MSD is a reliable company
that produces quality products. Part number on the injector is PN 2013.
They also sell stand alone injector fuel delivery top mounts so there are
no requirements for a fuel rail. The injectors can be mounted
at any angle. MSD has a wide range of all the parts you need to build
an EFI system.
www.msdignition.com
We will have these available for two inch OD tubes used on P-port engines.
We are still looking for a distributor to retail this along
with all the other p-port stuff we are building like slide throttles
and bell mouths for 2 inch OD .065 wall tubing.
Paul Lamar
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RC Engineering says that 40lb is OK:
Fuel Injector Worksheet
------------------------------------------------------------
[Actual Desired Crankshaft Horsepower]B.H.P.
[Number of (same size) injectors to be used]
[Brake Specific Fuel Consumption desired]
* See note below.
[Maximum Injector Duty Cycle you will see]
Warning: Duty cycle should not exceed 80% for these calculations.
[System fuel pressure @ fuel rail]PSIG
-------------------------------------------------------------
[(Static flow) injector required @ test PSI of 43.5]
Lb/Hr cc/min
[Image]
* Brake specific should be .45 to .50 for naturally aspirated
Ken Powell
501-847-4721
Well that is true if you are running lean but ANY aircraft engine running full power
full rich for takeoff or top speed is .60 to .65 BSFC. Tracy Crook's engine burns
20 gallons an hour during the Sun 100 Race. That would be 120 pounds an hour. Divided
by .6 is 200 HP. About right for a low power RX8 engine with only four ports
available rather than the six ports in the high power RX8 engine version.
Notice the dual HP and torque curves for this Mazda p-port four rotor Lemans engine.
The curves are labeled power and efficiency. I have applied Aubrey's conversion
to the Lemans engine efficiency BSFC curves. The BSFC curve for high power configuration is
missing. No telling what it was and I don't think Mazda wants you to know :)
To run at full power without full rich risks detonation.
Paul Lamar
That would be:
(xx gm/Kw-hr)(1 lb/454 gm)(.746 Kw/1 hp)
overall: 1gm/Kw-hr = .00164 lb/hp-hr
Aubrey
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