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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: One for the guys that don't give up
Date: Mon, 24 Sep 2007 22:44:05 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Tracy,
I think I also had terrible radio noise related to injector staging? =20
At low RPM and ground taxi my radio was fine. At high power, the =20
radio became so noisy, the ATC asked me to get back on the ground.
Buly

On Sep 24, 2007, at 9:05 PM, Tracy Crook wrote:

> That Leading / Trailing ignition disable responce is still a =20
> mystery to me Al.  I finally got my 20B installation going well =20
> enough to test this and I got the same (expected) results as on my =20
> 13B and Renesis (more rpm drop on leading disable at any rpm).
>
> OTOH, I could not get a smooth staging transition to save my life.  =20=

> Investigation showed I was getting terrible electrical noise as the =20=

> staging relay switched with much (normal) contact bounce.  Since I =20
> didn't have any diode clamps in the staging circuit, there was a =20
> lot of noise generated by switching the inductive injector load.  =20
> It was noisy enough to cause my EM2 (and possibly the EC2) to reset =20=

> causing a lot of missing and occasional backfire during the staging =20=

> process.  Made me wonder if this was the cause of the data =20
> corruptions you were having in you EC2 map table.  I also thought =20
> it might be the cause of Marks'  high rpm miss but his problem =20
> turned out to be that he made the CAS mounting bracket out of =20
> ferrous metal instead of aluminum  (he used the Renesis crank =20
> sensor).  Glad he stuck with it and found this problem because I =20
> never could have guessed what it was.
>
> I don't know why Mark and Al are not having the staging problem =20
> that I am but this is the nature of alternative engines where there =20=

> are no two installations alike. In the future I am changing the 20B =20=

> staging relay to a solid state relay that has no contact bounce and =20=

> adding some clamping diodes to suppress the inductive noise.  This =20
> should make the EC2 20B controller less installation dependant.
>
> Still no  'Plug 'n Play' in the alternative engine game :>)
>
> Tracy  (still recovering from 36 hr drive back from Colorado)
>
>
> On 9/17/07, Al Gietzen <ALVentures@cox.net> wrote:
>
> I don't seldom give up on a problem, but I came awfully close this =20
> time.
>
> Mark
>
> OK; Mark; (or anybody).  Since we both have 20Bs, and both use the =20
> EC2 controller, maybe you have a clue for this one. I've brought =20
> this up here before, but no solution.
>
> I have all the latest updates on the EC2, and I have double checked =20=

> the static timing set at 35o BTDC.  =46rom that point on the EC2 is =20=

> handling the timing curve with rpm and MAP.
>
> At lower power levels, disabling the leading ignition clearly has a =20=

> larger effect than disabling the trailing =96 as one would expect.  =20=

> At somewhere around 18" MAP, (don't know right now what rpm that =20
> is, maybe close to 4000) the effect is about equal when disabling =20
> either set.  At higher power levels, there is a larger effect of =20
> disabling the trailing than the leading.  That troubles me.  I =20
> think the leading should always have a greater effect.  It makes me =20=

> wonder about the timing; or if something else is wrong.
>
> I have in the past tried varying the timing 2 or 3 steps while at =20
> power, but couldn't discern a change in rpm greater than the normal =20=

> variation in the readout.  Tracy sent me the XL spreadsheet with =20
> the timing curve data, but I haven't yet figured a safe way of =20
> checking it with that prop spinning close by.
>
> Does your installation exhibit the same behavior?  Is there some =20
> explanation for this?  What test should I perform?
>
> One thing that occurs to me is that Tracy measures MAP out before =20
> the runners.  I measure MAP at the manifold, downstream from intake =20=

> plenum and three short runners and the 3-barrel TWM throttle body.  =20=

> At WOT my MAP is not atmospheric pressure =96 it is maybe 2-3" HG =20
> less.  I can't quite see how that is an issue; but maybe someone =20
> else with a TWM TB setup with the MAP port downstream would know.
>
>
> Other than that I'm very pleased with the new mixture correction =20
> table setup for the 20B.  Much less tuning and seamless transistion =20=

> between tables and through the stage point.  Probably the pulse =20
> clamping and injector isolation diodes are part of that.
>
>