Okay, so Ive been trying to delve into motor operation a bit more and go a bit deeper in my understanding. One thing I have been looking at is ignition timing. I dont promise this will be short, so bear with me.
We run what, 16, 18, 20* timing at WOT depending on tune and knock and all that stuff. This timing is BTDC correct? That is the spark is fired at a point before the piston reaches TDC, right?
Okay, I understand why that is. It takes time to for the flame front to propagate and to build pressure. The idea being that peak pressure occurs somewhere at TDC so that you have maximum force pushing down on the piston to develop even more torque.
That being true (and Im kinda thinking out loud here) why does everyone what more timing, i.e., they want to run 22* timing instead of 20*? It would seem to me the more in advance you have to the spark occurring that less efficient your system really is. That is to say that if the air/fuel mixture were more turbulent (better mixing and atomization) then ignition timing should be a smaller number since that would cause the flame front to advance faster and build pressure quicker. So would not higher ignition timing numbers indicate a issue with a/f mixture and burn? Or at least not at its optimum?
As well, if I were able to mix and atomize better and therefore use much smaller timing advance numbers, would not that help reduce temps some since the heat/explosion if you will is in the cylinder a smaller amount of time?
My understanding is that ideally you would want timing at 0*, the pressure built immediately and more pressure was available to push down on the piston, correct? Are you not wasting some of the energy that could go to moving the piston in the downward stroke?
So if I could come up with a way to cause the flame front to propagate faster, build pressure faster, and move ignition timing more towards 0*, would that not be a good thing?