Ed,
I tend to agree, but I can't help but wonder why GM added the heat sink.
Possibly there has been enough failed D581 coils to justify the extra 5
cents per coil.  Just a thought.  

Mark S.

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Tuesday, October 18, 2005 2:51 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Connectors for the D581 Coils

Bob, the only advantage I can see to the D585 is the metal heat sink
might
make it less susceptible to high under the cowl temps.  I recall losing
my
leading ignition coil early on due to the fact that a resistor in its
base
apparently could not take the continuos high rpm load and heat.  But, if
no
one is having problems with the D581 then probably nothing to be gained.

Ed
----- Original Message -----
From: "Bob White" <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, October 18, 2005 2:46 PM
Subject: [FlyRotary] Connectors for the D581 Coils


> Because I've had a request to build a coil cable for the D581, I did
> some serious searching to see if I could find the correct connector.
I
> might have found it, but I'm waiting to receive a sample to see if
it's
> actually the right one.
>
> After much searching on the web, I found a part number for the cable
> that connects 4 coils to a single 7 pin connector.  GM p/n 12582189.
> This is equivalent to the GM cable used with the D580 coils.  I
ordered
> one of them so that I would have a reference for the connector (see
> attached photo).
>
> I believe I've located the connector at the Delphi distributor.  I
have
> a sample on order to see if it truly matches.  If it's the right one,
I
> will be able to build the coil cables for the same price with either
> connector specified.
>
> Last week I looked at the connectors on a 2006 Chevrolet Truck at the
> local dealer.  It uses the same connector.
>
> I also ran across another coil that would probably work.  The D585
> coil.  The only thing is, it costs more, and someone would have to
> verify that it is functionally the same, so I don't see any advantage
in
> using it.
>
> For more pictures and information, I've put a web page at:
> http://www.roblinphoto.com/LS-1_Coils/LS-1Coils.html
>
> Bob W.
>
> --
> http://www.bob-white.com
> N93BD - Rotary Powered BD-4 (real soon)
> Prewired EC2 Cables - http://www.roblinphoto.com/shop/
>


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