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Originally Posted by DRW
First add lean burn to the car, then change the A/F ratio as a function of engine air consumption. In other words, as air consumption decreases (light throttle) set the A/F ratio really lean, like 20:1, so power is reduced not only by the ammount of air going into the engine, but also by the weak A/F ratio.
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Lean-burn? Another way to spell "burned exhaust valves"! The temp. rise will be high(er?)! Just a thought....
Then, there are emissions to consider ...with higher combustion temps, all this lean burn stuff screams higher NOx formation! If it won't pass emission specs...it ain't legal!
Sludgy 
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