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MG MGB Technical - Distributor

I finally cured the miss in my engine - removed distributor cap and rotor and then reinstalled them. Problem disappeared.

The cap and rotor are worn, however, and need replacement. The problem - the distributor is not like any of the illustrations in the Victoria catalog. In fact, it looks like a unit which was in a MG midget I owned many years ago. It is a square metal body to which the cap clips directly. It is apparently part of an electronic ignition - a big power transistor sits in a heat sink on the fender - just like on my old MG Midget.

Anyone know what type distributor this is and what I should ask for to get a cap and rotor?
Terry

Terry. What year is your car? Could it be a Lucas 45D4, which is kind of squat as compared to the earlier 25D4? By far the easiest way to find out what you have is to remove it from the car and examine it. If it is a Lucas, it should have a specification number and a date code on it. Most points type distributors can have the points replaced with an "electronic ignition" or points replacement system. The transistor mounted on the heatsink is probably indicative of an aftermarket conversion to electronic ignition. It is even possible to convert the Mallory dual point distributor to electronic trigger. Hence, without removal and examination, it is very difficult to provide any help. Les
Les Bengtson

If it has a large squarish block on the side of the body, it sounds like the Opus ('Opeless) internal amplifier dizzy used on the early RB cars, with a conversion to a Crane-type or CEI external amplifier system. Buy the cap and rotor for either CEI or Opus distributors, I believe they are the same.
Paul Konkle

This thread was discussed between 30/12/2001 and 02/01/2002

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.