Jim,
Thanks for your most useful article. I will reassemble the distributor, retime
as per manual specs and richen up the mixture a flat or two. One note on plug
loading is that I have dark black on the front 3 plugs and grey on the rear
three. I backed off the front SU a few flats at last tune up thinking I was
too rich.
Perhaps I was chasing my tail with advance problems.
For tose who have not read the article I recommend it.
If nothing else it relieved me to know the secondary advance spring (heavy one)
should be slightly looser than the primary spring which is what I observed.
Hummmmm - fuel starvation at high RPMs/load, all the graphs in your article
indicate this to be a characteristic of the Healey engine.
Tracy
>
> From: "rjhco" <rjh@hockertlaw.us>
> Date: 2004/07/15 Thu PM 05:02:48 GMT
> To: "'Tracy Drummond'" <bighealey@charter.net>
> Subject: RE: Vacuum advance checkout on DM6 distributor question
>
> Tracy:
>
> The vacuum advance is not designed to function at high speeds with load
> applied. Your symptoms do not indicate a vacuum advance problem.
>
> It takes a vacuum of about 5Hg to move the advance plate so your sucking
> that results in movement may indicate that the vacuum is in fact working.
>
>
> I have attached an article that I wrote and that was published in AH
> Magazine. Reading it may help you understand the workings of your
> distributor.
>
> You symptoms point more towards fuel starvation at high rpms under load.
> You might also want to check air intake and exhaust to insure that no
> blockage is preventing flow.
>
> Best regards,
> Jim Hockert
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