iron_steel wrote: ↑
Thu Sep 17, 2020 4:12 pm
… can a bad setup of this table cause too much engine heating?
Yes. This is why you tune carefully with lots of data until you have enough experience with the engine to have an idea of what to expect. Generally, testing and adjusting timing to the minimum for best efficiency (MBT - Maximum Brake Torque timing, sometimes called MTBT for minimum timing for best torque) whether idle or WOT redline will provide best performance and power for the amount of heat produced. Compromises, such as retarded timing to delay the cylinder pressure peak in order to avoid detonation onset are not peak efficiency, and is not correct timing. However, they may be a necessary evil if cutting corners with poor quality or det-limited fuel, for example. Compromises are never a good thing, and a poor fuel choice is false economy.
Typically, over-advance (more than MBT) will flatten or reduce power, and eventually cause surging or bucking, and finally backfiring and parts damage. Under-advance (retarded below MBT) will soften and drop power and add excessive heat to the system, eventually causing parts overheating damage, detonation, pre-ignition, backfiring, etc. Yes, you can add too much heat with retard and cause the detonation you are trying to avoid.
This is commonly seen after tuning on a dyno with a series of good pulls with cool-downs, then on a longer track or highway run it detonates, quickly progressing to very destructive pre-ignition with the cumulative heat soak. Do not assume you are adding "insurance" with extra retard.