Tracy made a statement that he tuned
his engine so that with the mixture knob set at about 1:00 oclock, he got best power. How would you accomplish that in your tuning? Would you
set the mixture to 11, 12, or 1 oclock when tuning?
Bill B
I tuned with the knob at 12:00 –
then max power is around 1:30 and lean cruise is about 11:00. YMMV.
Al
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bobby J. Hughes
Sent: Thursday, June
25, 2009 10:44 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Auto Tune
vice Max Power???: [FlyRotary] Re: Consistant progress...not sure how to act?
I think
the programming knob position controls A/F ratio in auto tune. On my
installation with the programming knob at 12 o'clock it tunes for about 14.5
on my wideband. Set the knob to the right and it tunes for a richer mixture. At
least that's my observation.
Bobby
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Thursday, June
25, 2009 6:54 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Auto Tune
vice Max Power???: [FlyRotary] Re: Consistant progress...not sure how to act?
You are correct, Mark. If did preface my
observation with “IF your
fuel flow is calibrated and accurate..” {:>). Which
could be a big assumption.
However, not being familiar with the Auto Tune
feature, I have no idea what is required to calibrate the fuel flow or whether
you can do it on the ground or not. However, Chris did indicate he was
attempting to use the “Auto Tune” feature – which I believe
is for tuning for cruise not best power. IF that assumption is
correct then it begs the question of whether it affects full power WOT
operation or is automatically cut out of the fuel control loop under that
condition.
I just thought the suggestion to turn it off or
temporary disable the Auto tune might be an easy thing to check to see if it
affected the RPM and fuel flow.
Ed
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Thursday, June
25, 2009 8:09 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Auto Tune
vice Max Power???: [FlyRotary] Re: Consistant progress...not sure how to act?
Isn't that a pretty big assumption to expect the
fuel flow to be calibrated and accurate considering that he hasn't yet flown
and just switched to larger injectors? I've been flying for two years and
I'm not done tweaking the fuel flow calibration on my EM-2. If that
is in fact the case, isn't everything else a moot point?
On Thu, Jun 25, 2009 at 6:24 AM, Ed Anderson <eanderson@carolina.rr.com>
wrote:
Chris,
IF your fuel flow is calibrated and accurate a fuel flow of 11 gph at 5870
rpm and 29" Hg, that would indicate an air/fuel ratio of around 16:1.
Now,
I am not familiar with Tracy's auto tune function (no EM2), so
don't know if
it's trying to achieve a 14.7:1 Stoichiometric ratio or not - but, my
calculations indicates your engine may have been running a bit lean for best
power.
For best power you want an air/fuel ratio of around 12.65:1. If you have
that A/F ratio then your 5870 rpm at WOT and 29"Hg would give you around
155
HP with a fuel flow of around 14.4 gph.
I don't know if you can, but IF you can, I would turn off/disable the auto
tune feature and try just manually adjusting your fuel mixture knob to give
you a richer A/F and see what that gives you. I could be wrong, but my
understanding is that the auto tune is more for tuning for economy rather
than max power.
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Christopher Barber
Sent: Thursday, June 25, 2009 4:43 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Consistant progress...not sure how to act?
I went out tonight and checked for leaks and could not find any, but you
are right, it is likely idling too high. I will likely remove the
suspect part of the manifold and give it a more diligent inspection.
The Mistral intake is two major parts. The part that is bolted onto the
engine has nothing that could leak. It is connected to the throttle
body portion by aluminum tubes. The throttle body portion has a couple
of places that could leak. That being said, I was intense in my method
to seal the the openings that Mistral provided to attached various hoses
that I am not using. However, I will verify.
I did verify that the throttle is closing all the way, so I got some
more investigating to do.
In a similar note and perhaps this should be more directed at Tracy but
how does the EM2 determine Horsepower and Percent of power. Tonight
when I cranked the power to full at about 5870 rpm's I was looking at a
fuel flow of about 11 gph (which if I read previous post correctly is
low) and a HP of about 93 which indicated 50% power. Now, I was at FULL
power, but is was indicating 93 HP and 50% power. Whats up with that?
OH OH OH, the MP was showing 29. (for once I remembered to look <g>)
I did learn something tonight. If I forget to turn on the fan while
sitting on the ramp at 86 degree Houston night, my temps shoot up much
faster.
I do think my staging point is either 15 or 15.5 by looking at the
asterisk coming on and off while near idle. I have had my EC2 since
2005 and even though Tracy has updated it, I think the staging is the same.
I am still working out EC2 issues. While it is running much, much
better, it still seems to change subtle elements of the MAP table on its
own. I don't know yet if this is due to my attempt at using Auto Tune
mode or not. It seems when I shut it down at night and come back the
next days, minor difference are present. Not sure why it seems to have a
mind of its own. Of course, getting time to focus on the differences is
difficult. I know, I am preaching to the choir, as we all have time
constraints.
I hope I am actually making progress <g>
All the best,
Chris
Al Gietzen wrote:
> I meant to note the MP but forgot. IIRC the MP was what I considered
a
bit
> high at about 15. Since this is where Tracy has the staging point by
design
> (15 or 15.5 I think) I noticed it
>
> Chris;
>
> I see Map of 10 - 11" at idle. By 15 it's putting out some
serious power.
> Either the throttle isn't closing or you have a pretty serious leak.
>
> I think on the more recent versions Tracy has been setting the
default
> staging higher, like 16.5 - 17".
>
> Best,
>
> Al
>
>
>
> --
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