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