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From: "George Lendich" <lendich@aanet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3730341@logan.com>
Subject: Re: [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]
Date: Wed, 24 Jun 2009 15:39:27 +1000
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Dennis,
I thought the 495cc injectors were Blue and the yellow were 380 cc?
If your running your experiment with the Yellow injectors can you give us 
some feed-back when your done.
George ( down under)

> 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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