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From: "Steven W. Boese" <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Date: Fri, 27 Nov 2009 10:55:16 -0700
Subject: RE: [FlyRotary] Ground isn't ground
Thread-Topic: [FlyRotary] Ground isn't ground
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Kelly,

I guess the 2nd EC2 could be considered a "spare".  There is only one EC2 i=
nstalled in my plane.

There are a couple of reasons I have the two units.  The first is that I pu=
rchased a firewall forward setup from a friend who had scratch built a plan=
e similar to an RV3 using a 13B power plant.  He had trained in B17's in pr=
eparation for deployment in WWII but the war ended before he was deployed. =
 He recently lost his medical, sold the airframe, but still had the firewal=
l forward equipment.  I figured that he could use the funds more than the f=
irewall forward equipment so we reached an agreement.  I see this and my ch=
oice of my RV6A's paint scheme loosely based on the Hellcats my late uncle =
flew in the Pacific at the end of the war as a small tribute to the "Greate=
st Generation".

The second reason is a selfish one in that I enjoy investigating how things=
 work.  My intent is to make an operational test cell from the firewall for=
ward equipment.  It is partially finished, waiting on mounting the engine a=
nd cooling system such that I can run it somewhat safely.  At this point al=
l the electronics is wired and I can operate the ignition and fuel injectio=
n systems by turning the CAS using a variable speed motor.  This has proven=
 useful for collecting data (without the complications of starter inrush cu=
rrents for example) for comparisons with data collected from the installati=
on in my plane.

Tracy,=20

I should have mentioned that your memory is not that bad.  Initially I was =
using the stock Mazda coils.  I changed to the LS1 coils with the EC2 updat=
e in January this year.

Steve Boese
  =20


________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of =
Kelly Troyer [keltro@att.net]
Sent: Friday, November 27, 2009 7:46 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Ground isn't ground

Steve,
   I have been following this informative exchange with great interest and =
even with my limited knowledge
am able to digest it............Thanks for your work in determining what is=
 going on inside Tracy's little
gray EC2/EC3 boxes in an effort to troubleshoot apparent ignition problems =
that some of the group
are having or have had in the past..............One thing am curious about =
( And I may have missed the
answer) is the reason you have two EC2's ?...............Do you just have a=
 spare or are you actually
flying with both for "Super Redundancy" ??...................
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "Steven W. Boese" <SBoese@uwyo.edu>: -=
-------------


> Tracy,
> One of the EC2's was updated 01/30/2009 and the other was updated 05/04/2=
009. While there is a difference in these two EC2's as to how they determin=
e which regions of the MAP table to use, they both are similar with regard =
to the low
> RPM coil dwell times.
> Abnormally short (or long) dwell times are observed from the minimum RPM =
that the EC2 generates signals up to the "threshold" at around 1200 RPM. Ab=
ove that
> threshold, dwell times are consistently in the range of 4-5 ms.
>
> Steve Boese
>
> Crook [tracy@rotaryaviation.com]
> Sent: Thursday, November 26, 2009 8:05 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Ground isn't ground
> Steve, I was looking at the wrong image (the one you sent of the CAS & dw=
ell at cranking speed of ~150 rpm.) . I must have missed this other one whe=
n you
> posted it. I'll take a look at the 1200 rpm dwell behavior again. I never
> noticed that. Possibly because 1200 is well above cranking speed but belo=
w my
> idle speed of 1600 rpm.
>
> Do you recall the date of your last EC2 update? The low rpm dwell algorit=
hm has
> changed a few times.
>
> Tracy