[TR] TR6 Vacuum Line Question

[Randall]

> I am trying to sort out the Vacuum lines on my recently acquired TR6.

Is this a restoration, or do you just want it to run good?

> The rear carb has vacuum ports at the top and bottom.  The 
> front has none.

Do you have carb numbers?  Sounds like the rear carb may have been modified,
but it might also be from another car.

The port that has vacuum at idle will be for vacuum retard; the one with
vacuum only with the throttle open will be for advance.  If the carbs are
off the car, then look at where the ports come out relative to the throttle
plate.  If you can see the port opening from the manifold side with the
throttle fully closed, that's a retard port.

> The distributor has a single port.

Advance or retard?  PI TR6 only had advance; later carbed TR6 only have
retard.

It will actually run fine if you just cap both carb lines and leave the
dizzy line open.  If you can hook up the advance, it will reduce fuel
consumption a bit (around 2-3 mpg), but no effect on idle or full power.
The vacuum retard only affects idle; but you may have to turn the idle rpm
down if it was set with the retard active.

Oh, and set the ignition timing to the 'static' value for your year.  The 4
ATDC figure is only for when the retard is connected and active (not
disabled by the TVS).  The books are amazingly unclear (aka flat wrong) on
this point as many of them say to disconnect the vacuum line, but that is
only for an advance vacuum line (which only early carbed TR6 should have).

-- Randall