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No, Bill
The snubber modification and the simulation are two
completely separate items. The snubber mod simply places a couple of
physical components on the board to prevent the voltage induced by the injectors
magnetic field collapsing from holding the injectors open longer than they
should be. The simulation is a software addition to the EC2 computer
program that permits you to trigger the injectors as if the engine were running
around 4000 rpm. This used Mode1, you can do a similar thing with mode 9
and the ignition circuit.
So I don't know whether you have the simulator or not but
it is not related to the snubber fix.
Best way to find out is turn off your fuel pumps, turn on
your EC2, put it in mode 1 and press the program control button. If the
injectors rapidly click then you have the simulation mode for certain.
Ed
----- Original Message -----
Sent: Tuesday, October 23, 2007 10:33
PM
Subject: [FlyRotary] Re: Fuel delivery at
WOT
Ed, Did I understand
that you have to have the “snubber” modification in order to get the injector
simulation mode? I have not had this mod. My instructions are at
the hangar, but I thought the “snubber” mod was the one that made the
simulation mode possible.???
The engine runs fine
with either primary or secondary injectors disabled. Also with leading
or trailing coils disabled. My fuel pressure is 39-40 lbs when the
engine is not running and 35-36 lbs when it is running. Turning on the
secondary pump raises these numbers by 2-3 lbs. I can hear fuel being
returned to the tank when the engine is not running….when it is running I
can’t hear anything!! J
Bill
B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Tuesday, October 23, 2007 8:31
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel delivery at
WOT
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.
----- 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
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