After all the time I've spent lurking on this list, perhaps I can finally
add my $.02 and advice to the list! I have a vacuum advance distributor
with tach drive on my '76 TR6. There is a picture of it at:
http://www.triumphowners.com/uploaded/34/2968-2968-111032_14distadv.jpg
Fairly simple to do. Get ahold of an early TR6 distributor ('69 - '71?)
which has both advance and retard vacuum units. The retard unit is
easily removed and can be replaced by a knurled nut and spring from a
different Lucas distributor (I used one from an MGB. So far my car has
had no detrimental reactions from the donation. lol!) Vacuum was picked
up from the front top vacuum fitting (this should be ported vacuum) of
the carb. I believe I did manipulate the drive gear a tooth or two such
that the tach cable aligned a little better.
The vacuum unit showed 5 - 18 - 10 which starts advance at 5" Hg, ends at
18" Hg, and has a total of 10 deg distributor advance or 20 deg crank
advance. I found that max advance was about 16 (crank) deg at 15". For
cruising at about 2200 rpm (60mph?), I was drawing about 12" Hg which
gave me about 12 deg vacuum advance for a total of 30 - 32 deg crank
advance. I can post complete numbers of mech and vacuum advance if
anyone is interested.
Hope this helps someone. Now if I only had these distributors to dump on
Ebay!
Dale O
'76 TR6
'78 Spit
Date: Mon, 11 Apr 2005 16:24:46 -0400 (EDT)
From: "Robert M. Lang" <lang@isis.mit.edu>
Subject: Re: Disssy
On Mon, 11 Apr 2005 RazorBobSr@aol.com wrote:
> Is it worth it to change from NON vac dis to VAC advance??? Where
could you
> get a vac advance dis??
Good luck!
If you find one with vacuum advance _AND_ a tach drive, please let us
know. Many of us have been looking for one of these for a LONG TIME.
Truth be told, there are racers that have dug around junk yards and come
up with solutions using parts from other vendors, but I don't know of any
for 6-cylinder Triumphs at this time other than the Mallory 23 series
dual-point dizzy and the equivalent "uni-lite" (non-points) version.
These
23 series units have mechanical advance only and no tach drive.
regards,
rml
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