> The 68 TR250 & early 69 TR6 to my knowledge were the only
> Triumph's to have
> both VR & VA.
Early Stags also had both, as did at least 69 GT6+. The documentation I
have handy indicates that the 69 Spitfire Mk 3 also had the spark retarded
at idle, although it did not use a vacuum capsule to retard the spark.
> I can attest to the total nightmarer trying to
> tune these as
> originally designed with non adjustable ZS's too boot.
ISTR the TR250 was further complicated by using manifold vacuum for the
retard, with a vacuum switch operated by the throttle linkage to kill the
retard when the throttle was opened. Likely a symptom of BL being caught
off-guard by the retard requirement, and not having time to get a suitable
vacuum port added to the carbs.
At any rate, my 71 Stag seemed to run pretty good with both VR & VA. The
second Stag has a 73 motor in it with only the VR (which is disabled) ... my
plan is to eventually add VA to it as soon as I find a UK-spec advance
capsule at a reasonable price (Paddock's were sold out when I last checked).
Randall
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