Actually, USA-spec Triumphs from about 1972-on used distributors with only
vacuum retard. The retard unit was routed to a vacuum port that only pulled
a vacuum at idle. This served to retard the idle timing, while having no
effect (or marginal effect) on engine timing off-idle. This was for
emissions purposes. Triumph also used a thermo switch in the circuit that,
in the case of engine overheating, would interrupt the idle vacuum and allow
the timing to be advanced until the engine cooled off a bit. According to
my Bentley manual. TR6 from 1972 to 1976, used Lucas distributor #41385,
which had centrifical advance and vacuum retard ONLY. Static timing was to
be set at 12 deg BTDC, with dynamic timing at 4 deg ATDC (@800-850 RPM).
Hope this helps,
Hugh Barber
Hollister, CA
'73 TR6
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net]On
Behalf Of Gregory Dito
Sent: Sunday, June 08, 2003 6:33 PM
To: Seth Glassman; 6 Pack
Subject: Re: TR6 Distributor
Seth,
Very early TR6 used both, but a 76 only had a vacuum advance. Typically
auto distributors have an advance, maybe both, but never a retard only.
Greg
CD6250L
----- Original Message -----
From: "Seth Glassman" <76tr6@optonline.net>
To: "6 Pack" <6pack@autox.team.net>
Sent: Sunday, June 08, 2003 7:56 PM
Subject: TR6 Distributor
> List,
>
> Can anyone tell me whether the Lucas distributor on the 1976 TR6 is a
vacuum advance or vacuum retard.
>
> Thanks,
> Seth Glassman
> 76 TR6 CF57223U0
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