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September 29th, 2008

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Q & A: Vacuum Advance Distributors

Monday March 18th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Mr Twist,

I bought a 1974 MGB chrome bumper car from an MG enthusiast in Florence AL. that I am rebuilding the engine on. I have been following Peter Burgess's book How To Power Tune MGB's. One of the things he mentions if I am reading correctly is that on a chome bumper car the distributor vacuum advance is connected to the SUs and not the intake manifold as on rubber bumper cars. When I bought this car, the air injection system had been removed and the distributer vacuum advance was connected to the intake manifold.

Acording to my friend you don't mind answering questions of this nature. Is this the correct place to connect the vacuum? In all of the shop manuals etc. there is no mention of where this is connected.

Your help is greatly appreciated.
Sincerely, Jeff Buettner

JEFF!

Peter writes from an English perspective. There are TWO types of distributors: mechanical advance only and mechanical with vacuum advance.

The purely mechanical distributors, fitted to the T types, to t... read more