Continuing ignition timing debate from the 416 thread.
The paper says it can take up to 100 cycles for fuel to stabilize after a change. 100 cycles = 1 second @ 6000 rpm. I'm pretty sure 100 cycles is not a hard number which is why they phrased it as "almost 100 cycles". The explanation of how the fuel travels at different speeds atomized vs wet flow seems to make sense as to why it was observed that what was an ideal a/f ratio for steady state turned out to be lean during a sweep.
I don't see how this same phenomenon would relate to timing. Unless the A/F ratio was not corrected from steady state to a sweep. But that would just mean you are adjusting timing for a too lean A/F ratio. Even if timing was affected by the sweep of the motor it seems to me it would make more sense to follow the papers recommendation for setting the A/F ratio "test for best power" and test the motor how it will be used.
Like I said, there are people who say it’s 250 cycles.
You need to do some steady state testing and move the timing and see what happens.
Im not sure why you think steady state testing won’t show you something different?
I have done it and the results are what I’m telling you. This is why I wasn’t going to even bother with this thread. You keep saying you don’t get it and you don’t.
You either need to do some steady state testing and prove it doesn’t work or just get off it. I will continue to tell people that virtually every engine out there wants LESS timing at peak torque and MORE timing at peak power because timing follows the VE curve.
It’s basic ****. The problem is doing sweep tests will not show you where the timing needs to be. You keep posting graphs of tests where all you are doing is adding timing everywhere to taking it away everywhere.
Im not talking about that. Im talking about taking the time to develop a curve using steady state load and the numbers the engine wants at peak torque and peak power won’t be the same, with peak torque wants LESS timing and peak power wanting MORE timing.
Can you do a sweep test and figure that out? If so, I love to hear how you do it because if you could accomplish a correct curve with sweep testing it would save me a huge amount of time.