Some cars will come with the capability to advance timing significantly, and they will often recommend premium octane fuels as these are less likely to generate knock. Knock, if not properly addressed, can easily ruin an engine. By advancing the timing (igniting the spark earlier) the probability of generating knock increases. Although efficiency is obviously a priority for manufacturers, so is reliability. If you fire too late, you’re wasting energy, as you want to make sure that peak pressure occurs when the piston is very close to top dead centre, so that as much of the pressure generated is turned into useful work. If you fire too soon, you’re creating a force counter to what the engine is trying to achieve, since the piston is attempting to compress a mixture, and the combustion is supplying pressure to force it down. When this spark fires is critically important. The cylinder is filled with an air fuel mixture, and your spark plug is awaiting the signal from the ECM to fire away. Think about a piston on its compression stroke. The idea behind ignition timing is simple.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |