By the way, I just discovered that the fuel pressure spec for the RX-8
is over 56 lbs! See the link.
http://www.myrotarycar.com/portal/forum/uploads/RX8TX/Manuals/CD05-xx-03le/index.html
Most of us have our pressure way lower than that and that will greatly
lower the output of the stock injectors since they are sized to deliver fuel at
that pressure. Could be why some of us are not getting throttle response
above 2/3 throttle? What about you guys with superchargers? Do you
go lean?
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Friday, June 19, 2009 10:58
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: 295cc vs
495 cc was [FlyRotary] responses to responses, not developing full power
Oh,
If you happen to be using the 6 port and plan to use only 4 of the
yellow injectors, they are only good for between 173 and 197 HP at 80% duty
cycle and BSFC of .5. You would have to use all 6 to realize that higher
HP that they are supposed to make.
I am thinking that they are sized small in the car because they
don’t expect you to be at WOT for long in the car and they will have a
chance to cool down. In our case they will be at WOT for hours and could
overheat if they were at a high duty cycle.
Thoughts??
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Friday, June 19, 2009 10:38
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: 295cc vs
495 cc was [FlyRotary] responses to responses, not developing full power
Bryan,
Well, ain’t that interesting!
That indicates that the injectors (according to calculators I found on
the web) will support between 183 and 206 HP with a duty cycle of 80% and an
BSFC of .5.
So much for all these wild guesses we have been making about how much
power we will get with the Renesis.
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bryan Winberry
Sent: Friday, June 19, 2009 10:03
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: 295cc vs
495 cc was [FlyRotary] responses to responses, not developing full power
Bill,
According to the manual, the flow rates
are:
Red 69-78 ccm/15s
Blue 118-133
Yellow 89-101
I’m assuming the 15s means 15
seconds. So, multiply these values by 4.
Bryan
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Friday, June 19, 2009 9:44
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: 295cc vs
495 cc was [FlyRotary] responses to responses, not developing full power
What is the actual size of the stock Renesis injectors? I was
under the understanding that the red primary was 295 ccm and the blue secondary
was 610 ccm. I heard that the yellow injectors from the hi power 6 port
were a different size, but have never heard what size they were supposed to be.
Don, did you say you had your injectors cleaned and flowed? What
did they flow?
Where can this information be found? Is is listed in a Mazda book
somewhere?
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy Crook
Sent: Friday, June 19, 2009 9:24
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495
cc was [FlyRotary] responses to responses, not developing full power
Mode 6 would handle it
but that is for normal staging only. The 'injector set
disabled' is a special case In which the EC2/3 does not know which set
has been disabled and therefore can't know exactly what to do. It's up to
the pilot to make the appropriate response on the mixture knob if the injectors
are not the same size.
Tracy
On Fri, Jun 19, 2009 at 10:17 AM, Al Gietzen <ALVentures@cox.net> wrote:
When
you switch the primary injectors off and secondary
injectors
on - the EC2 is still providing the same pulse duration (assuming
engine
manifold pressure, etc are the same) for the almost twice as large
secondary
injectors as it did for the smaller primary injectors. Ergo, you
are
feeding the engine almost twice the fuel (for the same engine
conditions)
as you did when on the primary injectors. The engine is choking
on
too much fuel.
Unless, of course, you have made the mode 6
adjustment to compensate for the difference in the flow rates – or will
mode 6 not handle such a big differential.
Al G