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[Spridgets] Still no workie update - Mallory Dual Point Distributor

To: Spridgets@autox.team.net
Subject: [Spridgets] Still no workie update - Mallory Dual Point Distributor
From: Edward Perez <eap2140@yahoo.com>
Date: Fri, 30 Oct 2009 11:17:49 -0700 (PDT)
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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