Chris,
On
the power drop… it would be helpful to know what the manifold pressure
is doing. Also, do you have a mixture meter (O2 sensor) in the
exhaust? What is it doing? Lastly, what is the fuel pressure doing
as the RPM drops? As Lynn
has mentioned a number of times, best power from the rotary happens when it’s
temps are around 160. How hot were you getting oil and water?
Neil
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Chris Barber
Sent: October-24-09 3:23 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] RPM drop
I hooked up my front oil cooler, the aviation one that was causing a
restriction in the system and leakage past the oil filter seal,
in parallel today with the standard Mazda stock radiator. I cranked
her up and the oil flowed and heated all parts of the system and after only
one snugging of a fixture, no leaks. Temps still were about the
same. I took the engine to full power. It does not like full power
on the ramp. The temps raise really quickly and even after 60 seconds, I
am at limits I am uncomfortable with. I can have it sit at idle
for over an hour with no problem. I have fans mounted, but they do not
seem to help much at high RPM's. The weather was quite cool for Houston at about 70
degrees today.
On a related note. As I have mentioned I am getting just over
6000 rpm at full throttle when I enrich the mixture. HOWEVER, once at
full throttle the rpm is dropping off a few hundred rpm....maybe down to 5400
rpm. If I throttle back and go back to WOT it can get to just about
6000 again....maybe not quite 6000. I can't play with it too long like
this as the temps raise so quickly.
Is this something obvious that I can check? Thoughts????