[Anthony]

My take (understanding) on hp is that is a function of how much chemical energy is released, and percent converted to mechanical energy. The limiting factor is the amount of oxygen that can be consumed, such that the maximum hp is obtained when running a little rich, ensuring all of the oxygen is consumed, although not all of the gas is consumed. Economy is maximized when just the opposite, all of the gas is consumed with a little oxygen left over. Since I believe the perfect A:F ratio is 14.7:1, then I would think (really guessing) to get max hp somewhere between 14-14.5:1, and highest economy at or slightly above 14.7:1 .


Hp potential is determined upon the effeciency of the engine to "pump" air, the more air, the more O2, the more hp. You can also increase hp by reducing internal engine friction, increasing piston sealing, reduce internal windage, engine accesories, cooler intake temperature (more O2), etc.

I 've seen graphs on maximum hp potential vs. A:F ratio, showing best economy and where max hp is obtainable, and that may be what your looking for.


I'm sure the engine builders can elaborate much more, and/or correct me.