[Mg-mmm] Identify Dizzy please

[Pat Mullen]

Terry is right about DQH6A. My NA 0895 (an NB) also came with this dizzy and
the 1930-39 Lucas catalogue agrees (see page 158).

I've just realised that I have a 408684! Barry Walker sold me my DUH6A 408684
FA32 644 120. It appears to be NOS. I have not found it in any Lucas
catalogue, including the 1939-54 and the 1945-60. (I know that several DUH6As
were spec'd for petrol tankers and other commercial lorries.)

 I presume it advances 2 x 120 = 240. According to Blower's specs for the
N-type, the car needed 200 advance on the crank at 2000 crank rpm, ending at
400 at 4000rpm - presumably using 1930s petrol - with the static advance set
at 200 BTDC.
This, presumably, is what a DQH6A gives us.

According to the1930-39 catalog, the SS100 and other SS dizzies were all
conventional direction, ie "CW" under Lucas's convention or CCW under what
most N.Americans use We need Lucas's "ACW"  (CW to us).

Which begs the question: "Which parts need to be replaced in order to change
the direction of these dizzies?"
Then we cd use the other DUH6As and, dare I say it, more modern dizzies with
vacuum control.

Cheers ........ Pat
***********************************************************************
  ----- Original Message -----
  From: Terry Sanders
  To: Pat Mullen ; DB35PA at aol.com ; mg-mmm at autox.team.net ; Bob Grunau
  Sent: Saturday, June 06, 2009 3:34 PM
  Subject: Re: [Mg-mmm] Identify Dizzy please


        Go to www.nammmr.com and look under "Technical" , "part numbers" for
the N types, DQH6A is what was with my NA and I believe it to be original.  I
also have a 6 cylinder dizzy here that is listed in the book to be for Jag
SS100...it will also work in the N type. I'm not at home right now so cannot
give you the number off of it.
        Terry

        --- On Sat, 6/6/09, Bob Grunau <grunau.garage at sympatico.ca> wrote:


          From: Bob Grunau <grunau.garage at sympatico.ca>
          Subject: Re: [Mg-mmm] Identify Dizzy please
          To: "Pat Mullen" <pmullen at telus.net>, DB35PA at aol.com,
mg-mmm at autox.team.net
          Date: Saturday, June 6, 2009, 2:13 PM


          Don,
          That is a very good find, The distributor in NA-0686 is also 408684
,
          DUH6A-0, FA 32, 544,  12 degrees.  So you have a 6 cylinder MMM
distributor
          that rotates CW when viewed from above. My Lucas book does not show
this
          number.

          BTW, most  DUH6A distributors, including 408684,  take the Lucas
point set
          400415. I am fortunate to have several spare sets.

          Also, if stuck with a ACW rotor, the brass pointer can be removed,
flipped
          over, and re-glued and presto, a CW rotor. The rotor in NA-0686 has
had this
          modification as the pointer is loose and the directional arrow is
underneath
          as installed.

          New question, I have a Lucas Model DKHA6A-0 , #406358 , type A132
six
          cylinder distributor.  Any idea if this will suit an MMM car?
Rotation?
          Degrees advance??
          My Lucas book has 1939 to about 1953 information and does not show
this
          distributor

          Best regards and thanks,
          Bob Grunau
          Canada