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Date: Wed, 09 Mar 2005 16:13:14 -0500
From: =?iso-8859-1?Q?G=E9raldine_Berger-Yvon_Cournoyer?= <geryvon@videotron.ca>
Subject: Re: [FlyRotary] Re: 13b ignition
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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> In a message dated 3/5/2005 3:44:34 PM Central Standard Time,
> sqpilot@bellsouth.net writes:
>
> <<  Anyone ever have an older Mazda that used the distributor ignition
care
> to comment about it's reliability as well as functionality?   Thanks in
advance
> for any info.  Paul Conner. >>
>
>
> I have two race engines (12As) with electronic distributors. Both leading
and
> trailing are triggered by the leading pickup. There is a MSD 6AL for each
> coil. Both leading and trailing fire at 27 degrees. from idle to 9,800
RPM. No
> ignition problems of any kind.
>
> Lynn E. Hanover


I fly a Zenair Zenith 200 powered by a 1986 13B equipped with a Mazda 1985
electronic distributor. I do not use the vacuum advance devices. I have
wired and switched leading and trailing separately, thinking that if one
circuit failed in flight I could fly on with the other circuit. With my
timing light, I adjust ignition timing to about 20-25 degrees BTDC leading
and about 15-20 BTDC trailing.

I never thought of using the leading igniter to control both leading and
trailing circuits, but now that you mention it, I am tempted to make it so,
if it will make a marked power improvement in the 5000 to 6000 rpm range.

Please advise.
Yvon.