Congratulations, Bill. Looks like
your manifold reference fuel pressure regulator is working properly.
Getting 5900 rpm on a 76x76 prop is doing
very good indeed! I get 6000-6200 with a 74x88 prop which I had cut
back from a 76” dia prop. With it a 76” I would normally get
around 5900 rpm. So your engine is producing good power - particularly
for a first start up.
Tracy Crook and I both found that (at
least the older 13Bs) that they continued to improve with run time - up to
around 200-250 hours. I know it would seem that is a long break-in
period, but we both found the same thing – slow increase in engine
power. Not huge, but noticeable, compression seemed to be the reason, it
appear to slowly get better.
I did notice that there did not seem to be
much difference in engine coolant temp going into and out of the engine, but
then not knowing the engine run rpm for that graph its hard to say –
looked like about a 5F increase. Are you using a stock water pump/pulley
or something different?
Looks very promising!!!!!
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Schertz
Sent: Tuesday, September 23, 2008
9:52 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Vacuum
Pulses
I am new at this engine running thing, having just done the
third start/run . I have some instrumentation, and am enclosing a plot of
Manifold pressure and Fuel pressure vs. time for the latest run. After letting
it warm up at ~14 in MP , I started increasing the power, and you can see that
the fuel pressure increases with the MP. Made one brief excursion to
~5900 rpm, swinging a 76x76 prop.
All tests so far are with the cowl off, but the ducts are in
place.
More tests tomorrow. Longer run, move to higher rpm, test
cooling system more
Bill Schertz
KIS Cruiser #4045
N343BS
----- Original Message -----
Sent: Tuesday, September
23, 2008 8:51 PM
Subject: [FlyRotary] Re:
Vacuum Pulses
Al, after giving some thought about
the directions that came with the Mallory pressure regulator, it states that if
you are not using a turbo or some other boost device, to just leave the vacuum
port open on the regulator, which may be my best option, as don't think I
have any need to leave it hooked up. No sudden acceleration of engine
anticipated. I plan on doing the orifices for the EC2 though. JohnD
Yes, I agree. I started out with a
unit that was not pressure referenced; for the same reason – NA. But
it turned out that Tracy’s
EC2 was setup with the assumption of MAP referenced pressure, and I had trouble
getting it tuned. So I replaced the regulator. This was in the
early days of the EC2; maybe that more recent versions will tune fine without
MAP reference.
Al
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