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Kelly,
I guess the 2nd EC2 could be considered a "spare". There is only one EC2 installed in my plane.
There are a couple of reasons I have the two units. The first is that I purchased a firewall forward setup from a friend who had scratch built a plane similar to an RV3 using a 13B power plant. He had trained in B17's in preparation for deployment in WWII but the war ended before he was deployed. He recently lost his medical, sold the airframe, but still had the firewall forward equipment. I figured that he could use the funds more than the firewall forward equipment so we reached an agreement. I see this and my choice 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 "Greatest 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 forward equipment. It is partially finished, waiting on mounting the engine and cooling system such that I can run it somewhat safely. At this point all the electronics is wired and I can operate the ignition and fuel injection systems by turning the CAS using a variable speed motor. This has proven useful for collecting data (without the complications of starter inrush currents for example) for comparisons with data collected from the installation in my plane.
Tracy,
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 update in January this year.
Steve Boese
________________________________________
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 05/04/2009. While there is a difference in these two EC2's as to how they determine 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. Above 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 & dwell at cranking speed of ~150 rpm.) . I must have missed this other one when 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 below my
> idle speed of 1600 rpm.
>
> Do you recall the date of your last EC2 update? The low rpm dwell algorithm has
> changed a few times.
>
> Tracy
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