Interesting stuff that I need to investigate.....
----- Forwarded Message ----
From: Barney Gaylord <barneymg@mgaguru.com>
To: eap2140@yahoo.com
Sent: Fri, October 30, 2009 10:36:17 AM
Subject: Re: Mallory Dual Point Distributor
At 09:49 AM 10/30/2009 -0600, you wrote:
> Ed Perez
> Seattle
>
> Year 74
> Model Midget
>
> I have a Mallory DP distributor that I am trying to install. .... How do I
>determine which way to install the drive gear? Does it matter?
Yeah, it matters, sort of. There are all sorts of ways to misalign various
parts in the distributor drive and still make it work. But if you don't want
to confuse yourself and other future mechanics, you should assemble it the
right way around.
Installation on the A-series engines in teh Midget are same as for the B-series
engines in MGA and MGB. Start with distributor drive gear alighment:
http://mgaguru.com/mgtech/ignition/ig103.htm
In short, with #1 piston at TDC on compression, the slot in the drive gear
should be offset below center and should be pointing toward the #1 spark plug.
When installing the drive dog on bottom of distributor shaft, hold distributor
with top end facing you and the rotor pointing to the right, Align the drive
dog with the key offset to the bottom and in line with the rotor.
End result of all this will be, with #1 piston at TDC on compression, the rotor
should be pointing toward the #1 spark plug. Then the spark plug wire coming
out of the distributor cap closest to #1 plug will connect to #1 plug.
> How do I identify which set of points is the "Primary" and which is
>"Secondary?" ....
When rotating the shaft and rotor anti-clockwise, the points set opening and
closing first is the leading (primary) points, and the points set opening and
closing last is the trailing (secondary) points. The spark happens when the
trailing points open (important for static timing setting).
Barney Gaylord
1958 MGA with an attitude
http://MGAguru.com
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