Tom,
Not an easy question to answer, but someone may know.
All i can tell you is on your Lucas vacuum advance, it has 3 numbers
e.g. 5 - 12 - 8
That indicates that the vacuum advance will start to operate when vacuum is
enough to raise mercury 5 inches, will stop when mercury has been raised 12
inches, and will have advanced the ignition by 8 degrees.
I don't have a vacuum advance so I've never attempted to test one (other than
the old "suck the end and see if it moves" test for a split diaphragm)
Best
Chris
Sent from my iPhone
On 17/04/2012, at 6:28 AM, Tom <ah3000me at gmail.com> wrote:
> If you put a vacuum gauge on the distributor advance, how much vacuum
> should you see when the throttle plate is closed, and when the throttle
> plate is partially opened?
>
> - Tom
>
> On Mon, Apr 16, 2012 at 2:18 PM, I Erbs <eyera3000 at gmail.com> wrote:
>
>> I was having advance issues with my 60 year old dizzy. Typical Lucas ;-)
>> I'm converting to a new petronics dizzy. Have not refired the car yet. I
>> had to take a break from resto to earn a living. Hope to have her running
>> soon. I love the look of the oem dizzy, so if yours is in good order and
>> you want modern spark ,convert the top bits and keep a set of points/
>> condensor in the boot.
>>
>> Ira
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