Dave,
I still do not understand the physical and operational differences of the vacuum
port for advance and retard.
Do you know of a source that shows a vacuum vs throttle position graph. I am
interested to see what the shape of the curve is and where the peak is....
I'd expect that the CD principle would cause the vacuum at the port to
have a plateau after a while as the throttle is opened (i.e. the piston, not the
throttle position is regulating vacuum to the port.
Can you describe the graph in words?
-Tony
Message text written by INTERNET:owner-triumphs-digest@autox.team.net
>From: David Massey <105671.471@compuserve.com>
>In fact it is exactly the opposite. Since the throttle plate works in the
>reverse direction from that in an SU carburettor the vacuum advance port
>would be located on the top of the carb and the vacuum retard is located on
>the bottom. The bottom of the throttle plate moves inward (downstream) as
>the throttle opens and this places the port after the plate when the
>throttle is closed (vacuum) and before the plate as it is opened (no
>vacuum).
<
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