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Re: Thanks for the advice- sputtering 74 MGB

To: paul.hunt1@blueyonder.co.uk
Subject: Re: Thanks for the advice- sputtering 74 MGB
From: Bob Howard <mgbob@juno.com>
Date: Sat, 7 Jan 2006 08:53:31 -0500
Paul,
  One would think that the sensitivity to wobble would be equal, but my
one experience has been that the Pertronics is less sensitive than the
points were.
  I knew the shaft was loose because of bushing wear. Ordered a bushing
from Moss, who supplied the Lucas bushing.  My machinist said it was
wrong in a couple of ways ( I forget now the details) and that he was not
willing to risk the distributor body attempting to fit the new bushing.  
Next step was to install a Pertronics.  The dwell angle range was reduced
by half or more.  Timing light on the pulley was then within 1/8" swing,
a great improvement.
   Some time later I read in MGB Driver that Peter Caldwell carries a
bushing  that fits our distributors.  As the engine was running fine with
Pertronics in place, I've left it alone until now, and it has been fine
for a couple of years. 
   Prodded into action by this discussion, I've just sent a note to Peter
asking if he still carries the bushings.  What I would like to do now is
to rebuild a spare distributor and put it into the MGB.
Bob


On Sat, 7 Jan 2006 11:24:30 -0000 "Paul Hunt"
<paul.hunt1@blueyonder.co.uk> writes:
> But wobbling a radial slot from side to side across an optical (at 
> least)
> sensor will surely cause the timing to trigger, and so a varying 
> wobble in
> use will cause varying timing?  Wobbling a radial slot closer to and 
> further
> away from the sensor will have no affect I agree, which *does* 
> differ from
> mechanical points.  Unless they have very effective shields either 
> side of
> the nominal trigger points I'd expect magnetic pickups to have much 
> the same
> sensitivity to wobble as points.
> 
> PaulH.




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