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From: "George Lendich" <lendich@aanet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3731821@logan.com>
Subject: Re: [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]
Date: Thu, 25 Jun 2009 11:43:13 +1000
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 Does anyone know what  injectors the 6 port Renesis came with?
I am still wondering where the 610ccm injectors came from, mentioned quite a 
few message back.
Trying hard not to become confused.
George ( down under)


>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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