----- Original Message -----
Sent: Wednesday, August 27, 2003 7:55
PM
Subject: [FlyRotary] MSD injector test
results
Greetings,
RC Engineering seems to
be a very fast and efficient operation. They just got my injectors
today, and have already called with test results. I sent 4 very slightly
used Mazda 550's, and 2 new MSD-2013's, which are supposed to be 50 lb/hr
(525 cc/min). They said all 6 injectors were clean, and needed no
service at all. The MSD's flowed less than advertised, but not by nearly
as much as I figured. Here are the results:
MSD- 498,
503
Mazda- 547, 549, 551,
551
I'm sure these are static
flow rates, and I think they also do pulsed flow tests, but I forgot to ask
about that. I'll get them back in a week, so I'll check the results when
I get the data sheets. 50 cc's difference only represents about a 10%
difference in flow, and doesn't really explain the large difference in mixture
that I see on the EC-2. I have to wonder if maybe there's more effect
than the number would indicate, since my MSD's are at the throttle body, with
about a 20 inch run to get to the rotors. I can see how this reduced
efficiency might make them seem smaller than they are, but I would also think
that Ed would see the same thing, and maybe he is.
If you guys (Ed and Al)
don't mind, I'd like to propose a test. At your convenience, and
I'm not kidding- don't make any special trips, or go to any real effort.
Could each of you run at low power, below the staging point, maybe 1500 rpm,
and enable only one set of injectors at a time. I'd be interested
to see what position on the mixture knob you have to use for each set.
On mine, I have to turn the mixture knob to about 9:00 for the Mazda 550's,
and about 3:00 for the MSD's.
The test will be
interesting, since (as I recall) Al has Mazda 550's as primaries, and
also has the same MSD's that flow about 500 as secondaries. I can't
recall if I've ever seen the physical layout of these though. Are
they all the same distance from the rotors?
Ed, I believe, has
matched injectors, with a large distance between the secondaries and the
rotors. Any difference in his mixture setting will indicate a loss of
efficiency resulting from the large distance.
Sorry to keep dragging
everyone through this, but the difference bugs me.
Rusty (T minus 3 days to
liftoff)
PS- speaking of fast,
efficient operations, I sent my ailing Lightspeed Thirty-3G headset for repair
Monday via next day UPS. Lightspeed got it Tuesday, fixed it, and
shipped it out the same day, via next day UPS. The repaired headset is
back in my hands today, and they threw in a free holder for the battery box
that I told them I wanted to purchase. Bummer that it broke, but
mighty friendly folks, and GREAT service!