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Yes to both. I think that the EC-2 can be tuned to accept the slight
difference between the two colors of injectors. If it can not, I still have
the option of installing all 4 yellow. That would mean that I would have to
increase the fuel pressure to 57 psi which I would like to avoid.
I am really interested in hearing what other Renesis fliers are using for
fuel pressure and what fuel flow they are getting on takeoff or WOT. They
should be getting a fuel flow of around 20 GPM and I am curious to know if
they are.
Bill B
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of George Lendich
Sent: Monday, June 22, 2009 7:23 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495 cc was [FlyRotary] responses to
responses, not developing full power
Bill,
I guess that's yellow primary at an average of 380cc/m and blue secondary
502cc/m = 882cc/m = 441cc/m each injector.
Can you get 440cc/m injectors? (as Tracy suggests) if you can, you will have
2 injectors the same, as Ed suggests. Might make things simpler to manage.
I guess you might be saying you have the yellow and blue injectors to hand,
and wish to use what you have.
George (down under)
> Here is the plan I am considering. Please feel free to comment.
> In light of the fact that the fuel pressure on the Renesis should be
> 57 lbs in order to get the spec flow from the injectors.
> I will replace the red injectors with the yellow injectors. Looking
> at the flow range shown in the manual, this will give a total flow of
> between 1656CCM and 1872CCM at the spec pressure of 57 psi. At 100%
> duty cycle, that should support HP of 287-324.
> If I reduce the fuel pressure from 57 psi to 43 psi, that will reduce
> the range of the fuel flow to 1438ccm to 1626ccm. At a duty cycle of
> 85% that will support a HP of 212-240.
> Pro's:
> Plenty of fuel at a fuel pressure that allows a higher GPM and lower
> amp draw. (should easily provide full power on battery voltage only
> and will increase the no alternator range) Will allow the EC-2
> secondary injector differential in Mode 6 to be cancelled. (this is
> only required? When the injectors are more than 50% different. They
> will be between 15% and 32% different depending on the range given)
> Should be able to lower the MAP table here to compensate?
> Con's:
> Do you have any yellow injectors?
>
> I considered going to only yellow injectors. This will flow the same
> fuel as the stock setup, but only at the 57 psi. The only advantage
> here is cancelling the injector differential.
>
> What say ye? Tracy are you gone to Co yet?
>
> Bill B
>
>
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