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From: "DaveLeonard" <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] #$!%@$ temperatures still high
Date: Tue, 5 Oct 2004 17:05:10 -0700
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Steve,  sorry to hear that your temps are so high.  One thing I notice about
your description that is different from what I experience is the speed with
which your temps seem to change.  My system seems to have significantly more
inertia.

It is possible to me to overheat the coolant, but I really have to be
climbing hard or running a lot of boost.  On the first take off of the day I
have several minutes of steep climbing (6-7000') before I need to level out
some and pick up speed.  If the engine is already hot I have to be careful
from the start.  Likewise when coming down.  If I do get my coolant up to
220, it takes a full five minutes of low power descent to get it back into
the low-normal range.

I wonder what is different between our systems - volume of coolant?
Whatever it is, this may a clue for you.

I would definitely fix the mixture.  I had that problem as well and it was
greatly improved with detailed and repeated narrow width (mode 2)
programming.  Then I found my voltage problem and fixed it all.

JMHO,
Dave Leonard


> I flew the Cozy this after noon, and was very disappointed in the
> temperatures.  The OAT was 81, and the coolant read 225 on the temperature
> gauge, and the oil climbed slowly to 207 peak.  The coolant did come down
> about 10 degrees when I throttled back at pattern altitude, but
> leveled off
> there.
>
> When I throttled back on approach the coolant was about 180 and oil 190 on
> touchdown.
>
> It appears to me that I don't have enough sq in of inlet area.  I
> do have a
> P51 style scoop that I can bolt on, and try, but I don't have
> allot of faith
> that it will solve the problem.  Tomorrow, it is suppose to be
> cooler, about
> 55 or so in the A.M., so maybe I'll try the other scoop with the cool
> temperatures just to see what happens.  If the temperatures are low, I may
> fly for an hour or more, just to test some other systems.
>
> My next plan is to cut off the 2 12 sq in armpit scoops and
> enlarge them to
> 25 sq in.  I'll then remove the oil cooler from the main scoop, which will
> give the A/C evaporator cores about 22 sq in of additional inlet
> area.  I'll
> feed the oil cooler from one of the armpit scoops.  The other armpit scoop
> feeds the intercooler and engine inlet air.
> That is, unless someone has a better idea.
>
> I have a couple of other nagging issues:
>
> 1) I seem to be running rich.  I turned the fuel pressure down
> some (30 PSI
> on my gauge (don't know if it's accurate)). That helped, but running both
> fuel pumps makes the engine run very rich at full power.  Turning off one
> pump increases power and smoothness.  At an idle, 1000-2000 RMS, if I shut
> off the main fuel pump, the engine smoothes out, and gain a little rpm,
> before running out of fuel.
>
> 2) For whatever reason the "coil test" has stopped working.  I used to be
> able to go to the "B" controller, and do the coil test to check
> the leading
> or trailing coils.  That doesn't work, and if I turn it to off (I'm using
> the ignition switch), it keeps on running.  Used to kill the
> engine before.
> I'm not sure what this is, and haven't really done any testing yet.
>
> Steve Brooks (praying for cold weather)
>
>
>
>
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