I would highly recommend you read the Chrysler Master Training Document #240 Combustion in Engines and #241 The CAP story. Can be found here:
http://www.imperialclub.com/Repair/Lit/Master/index.htmLot of conflicting information out there. The above are good simple explanations of the combustion process.
For those that have hot cars and use Manifold vacuum to supplement idle timing, don't you really risk detonation when you race it at the track? Mechanical timing will come in quicker then the vacuum timing will fall off and you will windup with too much total for a period.
Each motor is different, but carb, fuel, cleanliness of motor, blue printing all come into play on how a motor performs.
Ignition is not an explosion, it is a timed burn. If you can't start your car with 16 initial when hot nor get it to idle correct with less initial, can't the issue be something else?
