----- Original Message -----
Sent:
Thursday, July 05,
2007 7:12
PM
Subject:
[FlyRotary] OMP flow rate
Does anyone know
what the flow rate is from the OMP?
Unfortunately, I
don’t know what year the pump is from. It is on my 20B which has a 12A
front cover. It is a 4-port, likely from a 13B, in which one port has
been blocked and the other three go one to each rotor
housing.
The only data I
have on hand is what Richard measured some years ago, running the pump at
6000 rpm. This could useful if I knew the ratio of pump speed to
eccentric shaft speed.
Thanks,
Al
The OMP drive
gear is the same size as the distributor gear. So it runs half as fast as
the E-shaft. In my tests I referred to the E-shaft
speed.
Thanks;
Richard. I wasn’t sure because what I have in my file ends with some
open question about the speed:
> At 6000RPM
crank speed and 48deg. control lever opening angle, the flow rate is 498cc
or .498Liter/hour.
> Opening the control lever to 90deg.resulted in a
flow rate of .688Liter/hour.
> The 90deg. position seems to be the
maximum for the pump. A run with the lever at 180deg. did not change the
flow rate.
>
> Richard.
> Richard. Your oil flow rate seems very high.
Fuel consumption off 30
> litres/hour at 6000 rpm and .5l of oil gives
a ratio of 60 to one. Most of
> us run around 120 - 150 to one. Does
the pump actually run at crank(e shaft)
> speed?
>
Ian Beadle RV6A W. Australia
Good point Ian. I don't
think it does.
Al
This test was at maximum condition setting. This condition
only exists in a 6000RPM/WOT situation. This rarely happens in a car. In
addition, the flow adjusted by the control lever does not seem to have a
linear characteristc, it is more like a snap at one point. I never
investigated that. I fully agree with the 120 - 150 to one as an
average.
Richard
Sohn
N2071U