OK, how do you make sure that the vacuum and centrifugal advance are working
correctly? Also, how much "play" is acceptable in a distributor drive shaft?
These are questions that have been on my mind a while?
Bob Johnson
BJ8
----- Original Message -----
From: "John Miller" <healeys@n4vu.com>
To: "Healey List" <healeys@autox.team.net>
Sent: Sunday, May 29, 2005 5:34 PM
Subject: Re: advance ignition timing 3000 MK1
> tnewton wrote:
>> I am sure this has been covered to death over time, but could some one
>> please
>> confirm a couple of details regarding ignition timing. What is the
>> general
>> consensus on how much advance seems to be best, and from the TDC timing
>> mark
>> on the pulley how many millimetres per degree (in other words what is the
>> circumference of the pulley divided by 360.
>> Although my car engine seems to like the present setting, when I checked
>> the
>> setting it measures at least one inch (25mm) advanced from TDC - I don't
>> know
>> what this would be in degrees but I suspect this is a very advanced
>> level?
>
> Please don't take this as gospel, but just another data point: with an
> engine of this vintage, provided the vacuum and centrifugal advances are
> working, the correct timing is the point at which you can just get it to
> ping under extreme load (typically lugged down beyond the point at which
> you would reasonably operate the engine). To put it another way, if you
> set the timing to spec with a light, and the engine either pings
> excessively or you can't get it to ping under any circumstances, then
> you might want to consider adjusting the timing away from "spec."
> --
> John Miller
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