View single post by Jensen Healey
 Posted: 04-27-2009 03:38 pm
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Jensen Healey



Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
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 Disconnect the vacuum line at the manifold and cap the tap. The vacuum retard system retards the timing by 7 degrees IIRC. Most people leave this capped.

With the idle timing set at 10 degrees BTDC you should see 17 degrees of additional advance as you increase the rpm. At 2500 rpm the the mechanical advance will be maxed and you should see no further changes with additional rpm.

If the timing reads 10 degrees even with increased rpm then the mechanical advance weights are gummed up or rusted.

If the advance is slow to rise and keeps rising up to 4500 rpm then you have a distributor from a MGB.

What are you seeing?

Kurt