|
Bill, I do not have a Renesis but may have some things for
you to check.
With the older 13B with the 460 cc/min injectors, you
could get full power to over 6000 rpm on just the primaries along. The
Renesis I understand has smaller primary injectors - like 250 cc/min. I
strongly suspect they would NOT support full power past 6000 rpm perhaps even
less. So I suspect one of the following:
1. Secondary injectors not firing
2. EC2 is not staging to bring on the secondary
injectors
Your fuel flow does not appear to be the problem because
when you hit the cold start switch you got more fuel - but you didn't say how
long you ran it with the coldstart on - a few seconds or several minutes?
If several minutes, I would say your fuel flow system is probably not the
culprit.
The first thing I would check is to make certain all four
injectors are firing. You can do this by selecting Mode 1 and (after
making absolutely certain your fuel pumps are all OFF) hit the program
button. This should start the injector simulation mode - all 4 injectors
clicking away like mad. Using a small wooden/metal rod tube to hold close
to your ear place the other end on each injector - you should hear all four
clicking. If the secondary injectors are not clicking then you can start
your trouble shooting.
The injectors could all be working, but for some reason
the EC2 is not staging - don't know what would cause this, but if the staging
manifold pressure were accidentally set to much higher than Tracy recommends,
then you could be running out of fuel from the primaries before the secondary
kick in.
Even if the secondary were not working, by turning on the
cold start you would have doubled the pulse to the primaries thereby essentially
doubling your fuel amount injected.
Lastly you could have a fuel flow restriction some place
in your system.
Hope this helps.
Ed
----- Original Message -----
Sent: Tuesday, October 23, 2007 6:34
PM
Subject: [FlyRotary] Fuel delivery at
WOT
I have been concerned
that I am not getting the static rpm that others are getting with similar
props. I have the stock Renesis with the Performance Props 76 X
88. I seem to be limited to about 4200 rpm. I hit 4800 once the
other day, but did not know what might have caused the change. I just
finished the install of the pressure overflow bottle per Lynn’s msg of a while
back and was running the engine up to try and eliminate any air that might
still be in the engine. I noticed that when the rpm reached 4200 or so,
I still had about an inch of throttle left. After pondering that for a
couple of minutes, I pushed the throttle to the wall, the engine started to
run rough, and I reached over and flipped the cold start switch
on….
Mein
Cod!!!
It immediately hit
5350!
Apparently I am not
getting enough fuel flow to support high rpm. I have not done the self
tuning at high rpm yet, but I would not expect that the fuel flow would be so
low as to limit the rpm.
What suggestions do
you have? My ability to self tune has been limited due to cooling
issues…especially at WOT!
Lynn, it is too early to
be sure yet, but your idea for the pressure bottle looks like it is going to
help the cooling a lot. It may not be the complete solution, but it
seems to be a step in the right direction.
Thanks!
Bill
B
|