Good suggestion, but we thought of that. As part of the prep I had removed
the distributor and disassembled it to clean & lube the mechanical advance
weights and springs. And Gary checked the vac advance with a vacuum gauge
and hand pump. Furthermore, watching the timing mark while Gary revved the
engine, the mark seemed to advance correctly (although there are no pointers
in that range) by around 20-30 degrees total.
Thanks for the response.
on 9/10/01 11:02 AM, Dave Wood at dwood143@home.com wrote:
> Max,
>
> Does both the mechanical and vacuum advance work? I'd check that out before
> I went anywhere else. It sounds like you pretty much timed it by how it
> runs, which generally works pretty well. I adjust my timing with the
> vernier once I get it pretty close. The air pump and plugged air holes
> shouldn't make any difference. I don't remember if the 69 had the gulp
> valve also. If it does, it should also be removed and the vacuum holes
> plugged.
>
> I have a similar set up in my 72 B with a Pertronix unit. I found that my
> vacuum advance didn't work at all so I ordered a new one from LBCarCo and
> what a difference it makes. However, the mechanical advance sometimes gets
> gummed up and doesn't work either. I think they each account for about half
> the total advance, so if either is not functioning you will not have
> adequate power at increased rpms even though it will idle and rev under no
> load.
>
> Dave 72 B
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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