Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
Can anybody please explain to me how ignition timing works on a hit and miss glow plug engine?With a normal spark ignition four stroke, fuel is drawn in on the induction, or suction stroke, compressed on the compression stroke, and ignited by the spark occurring at the end of the compression stroke.With an engine such as my Otto, which uses propane and has glow plug ignition, surely the gas/air mixture will ignite on the induction stroke, as soon as it comes into contact with the hot glow plug, or will it not ignite until compressed on the compression stroke?Also, the intake of gas to the inlet chamber beneath the inlet valve, is controlled by a hit and miss pecker operated valve in the carburettor, whose operation is dependent on engine speed. As the engine slows down, the pecker opens the valve to admit another shot of gas to the inlet chamber. This means that the gas valve will not necessarily operate as the same time that the inlet valve is opening as there is no synchronisation between the two. Presumably, gas is simply held in the inlet chamber until the inlet valve next opens?Sorry if these seem like daft questions, but I really need to get this clear if I am ever going to get the Otto to run. As I have reported in my Otto thread, I can get some firing when turning the flywheel with an electric drill, but not sign of anything when turning it more slowly by hand.