03-01-2019, 08:02 AM
The topic of ignition advance and all the confusion associated manual and auto instructions, the various auto advance ranges, both original and as modified or worn, and the bum and oft repeated info in Ruby 1 book, recurs. Covered in post of 13.11.17.
TDC static is not ideal for all auto.
In the days when all cars were provided with accessory crank handles, static timing up to 10 deg was quite normal.
The requirements of the racing/motorway fraternity are for absolute max power at high rpm, usually with robust cranks, and these often considered expendable.
The requirement for sedately driven stock engines, with rpm seldom or never attaining 4,000 rpm, and often with an original crank is somewhat different. The minimum advance for reasonable performance and tolerable smoothness should be used.
The various opinions expressed need to be read with thought of the application.
Do not judge power from noise. Without a test hill and careful allowance for engine warm up etc, the tendency to judge power from engine noise makes it difficult to compare settings.
Manual advance is very instructive. I would not deliberately knobble, although it can be retained as an override (or one made using choke or mower type cable).
TDC static is not ideal for all auto.
In the days when all cars were provided with accessory crank handles, static timing up to 10 deg was quite normal.
The requirements of the racing/motorway fraternity are for absolute max power at high rpm, usually with robust cranks, and these often considered expendable.
The requirement for sedately driven stock engines, with rpm seldom or never attaining 4,000 rpm, and often with an original crank is somewhat different. The minimum advance for reasonable performance and tolerable smoothness should be used.
The various opinions expressed need to be read with thought of the application.
Do not judge power from noise. Without a test hill and careful allowance for engine warm up etc, the tendency to judge power from engine noise makes it difficult to compare settings.
Manual advance is very instructive. I would not deliberately knobble, although it can be retained as an override (or one made using choke or mower type cable).