degrees]bTDC - Degrees Before Top Dead Center
This value describes the distance between blip start and the firing top dead center
of the working cycle in which the blip occurs.
By the way, the Top Dead Center
tool I used is one I've had for more than 30 years.
The type M durometer produced curves which were more peaked, with the hardness values rapidly decreasing on either side of top dead center
Two signals are provided: a top dead center
indicating the zero degree position of the crankshaft and a pulse per degree signal.
Turn the engine so the piston is at top dead center
(all the way up in the cylinder) and secure the output shaft so it cannot turn.
A magneto-based ignition system always fires the spark plugs at the same point--usually 25 degrees before top dead center
--with the idea that the combustion event will reach maximum pressure by the time the piston reaches about 11 to 17 degrees past top dead center
I found that when I duplicated their original torque I invariably "over timed", meaning the extensions went too far and actually passed top dead center
The 4-cycle, 4-cylinder engine of early Farmalls was set at the factory to provide current to the spark plug from 8 to 4 degrees before top dead center
The diesel fuel is delivered just prior to top dead center
, followed by the main fuel quantity of natural gas.
Chief among them: A unique disc-valve design that handles both the inlet and outlet valves of the compression cylinder, allowing trapped gases to be removed from the cylinder, which improves volumetric efficiency, while spark plug firing has been configured to occur after top dead center
for improved thermal performance.