22-03-2021, 02:28 AM
A major objective with any engine and particularly Sevens which are not very robust is not to have any more advance when running than necessary to obtain full power (or preferably a shade less.) Do not judge power by engine sound. An advanced spark can sound powerful with harsh engine and sharp exhaust but with little or no real gain.
There were two types of original automatic distributor and the type of internals and wear renders characteristics of any often uncertain. The static and idling speed timing settings may not produce the optimum running setting without futher adjustment. A significant 2 degrees change on the crank is only 1 degree of rotation of the distributor so the final adjustment is quite minor. When you do find your way to the flywheel markings, beware the early Ruby handbook and many derived books which were in error, advising the full advance setting as for earlier manual control cars.
There were two types of original automatic distributor and the type of internals and wear renders characteristics of any often uncertain. The static and idling speed timing settings may not produce the optimum running setting without futher adjustment. A significant 2 degrees change on the crank is only 1 degree of rotation of the distributor so the final adjustment is quite minor. When you do find your way to the flywheel markings, beware the early Ruby handbook and many derived books which were in error, advising the full advance setting as for earlier manual control cars.