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In Reply to: OT: A/F Optimal/Max power....>>>> posted by Boris on September 30, 2001 at 22:22:00:
Thanks,
Boris
Got another question, while at it.... if 14.7 is optimal, then why is running a bit more rich (and ONLY with the .86 multiplier be the max power output?) Any engineers out there?
Thanks.
that the more fuel you can cram into the combustion chamber, the more power you can make. For max power, every additional droplet of fuel you can burn, the more forceful each combustion stroke will be. Take for example, top fuel dragsters. Even at idle, those puppies are dumping raw fuel right out the exhaust pipes. But they aren't concerned about fuel economy. They are trying to dump and ignite as much fuel in the engine as possible. You can't do this to that extreme on a car, however, because the raw fuel being trapped in your hot exhaust will cause backfiring and destruction of your catalytic convertor in no time.
On the flip side, I'm pretty sure you get better fuel economy by basically putting less fuel in the cylinders, or running the motor slightly lean. The problem with running lean is excessive heat build up because you don't have as much fuel to cool the cylinders.
Therefore, for max power, you want to dump more fuel than perfect combustion, or stoichiometric (14.7:1), but not so much that you dump raw fuel into your exhaust. So...your figure sounds pretty good.
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