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Bryan,
The RX8 manual show red and blue injectors for the 4 port. And yellow
for the six. Your correct. I know his secondary's are Siemens 540cc
because they came out of my pile of extra parts. He may have blue
primary's or found some yellow injectors to use. I'm sure he will chime
in next time he checks his email. Bobby
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bryan Winberry
Sent: Wednesday, June 24, 2009 7:31 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]
I have an '04 4 port Renesis and it came with red and blue injectors, no
yellow.
Bryan -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bobby J. Hughes
Sent: Wednesday, June 24, 2009 8:12 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]
Bill,
When he built his new intake he replaced the renesis secondary's with
540cc Bosch type injectors. He continued to run the red renesis
injectors as primary's. He said blue in his post but they are red. He
has since removed the red injectors from the block and is now running
the yellow injectors as primaries. So two yellow stock 4-port renesis
injectors as primary's and two 540 cc Siemens injectors as secondary's.
Bobby
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Wednesday, June 24, 2009 5:00 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]
Bobby,
That is not what Dennis is saying here. Did he change his secondarys as
well? I was wondering where he obtained the blue injectors. It makes
sense that he swapped out all of them??
Bill B -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Dennis Haverlah
Sent: Wednesday, June 24, 2009 12:26 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]
I've been following the injector thread for a few days so today I tried
an experiment. I ran my Renisis with stock injectors (295 Pri and 495
Sec) on the ground to see how it ran with primary or secondary injectors
turned off and how much HP I could generate with the 295 cc primaries. Note - My fuel pressure is set at 42 psi.
I found I could run around 140 HP ( HP as shown on the Not Calibrated
EM-2) with the primaries on and the secondaries off. I also found that as I opened the throttle above the 100 % duty cycle of
the primaries the engine would go lean quite rapidly and quit. If I were in take-off mode at low altitude and had a secondary injector
fail I don't believe I could diagnose the problem easily and keep the
engine running on the primaries!! My theory as to why the engien quits is that as I am running only on the
primaries and I advance the throttle beyond the point where the
primaries are at 100% duty cycle the engine starts to go too lean and
the RPM's decrease - This causes the MP to increase because the engine
is pumping less air. As the MP increases the volumn of air in the
combustion chamber increases. You need more fuel to compensate but the
injector is already supplying the maximum fuel it is capable of
supplying. The fire goes out and the engine quits. I believe to keep the engine running when I have a secondary injector
fail I'd need to throttle back to some where around 18 inches MP before
turning off the secondaries and figuring out the secondaries are bad. If the engine ran smooth on the primaries I could slowly advance the
throttle to increase HP as long as I did not go too high MP and get into
the lean condition. This is just too much stuff to do at low level just
after take-off!!
I now plan on replacing the blue 295 CC primary injectors with yellow
495 CC secondary injectors!!
Dennis H.
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