Mysterious Engine Failure - Ideas, please

[Bob Culver]

Over the decades we have had some electronic whizzes in the Jowett Club. With the cyls near the wheels, poor plug covers, exposed coil etc, like early Minis, prone to trouble. Most reverted to standard eventually. The high available voltages could not be exploited and generally more troublesome and unfixable. My RP ran fine on the original components. In Wellington head winds, with horizontal rain and sea spray it never missed, despite exposed plug tops etc. Economy is no longer prime objective and weak mixtures seem to erode valve seats. With normal mixtures ign demands are not great.
As above I suspect the nature of the spark influences effective advance so differences are apparent but can be gained by tinkering the original.