There are plenty of used units about that can be used as a donor, e.g.
from Triumph, Mini, Morris, Landrover, MG etc. I do not know if they
differ a lot or at all in spring rate, but I would guess they are all
more or less the same. May be left and right handed units have different
vacuum units.
However if you set the ignition dynamically, e.g. at 2500rpm (about when
usually the max advance is reached) you can do away with it alltogether.
Most performance engines do not use them. They are there to retard the
ignition (about 4 degrees) when idling to reduce emissions somewhat.
Kees Oudesluijs
NL
richard mayor schreef:
> Yesterday, I decided to check the vacuum unit on a distributor that I was
> getting ready to install in an early 3000 (Lucas DM6A). Zero, nada, nothing. I
> pulled out two other distributors and checked their vacuum units. Both very
> quickly leaked down to zero. Moss says they are not available. Does anyone
> have a source for these?
> Richard
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