11/24/2023 0 Comments Advances in ic engines pptThis only works if the engine air/fuel ratio (by mass) is stoichiometric (chemically correct). So what happen to change this? The problem is the three-way (CO, UHC, NOx) catalyst used on engine exhausts. In the old days, under cruising conditions, the engines always ran lean – about 15% excess air - this was economical. It is well known that fuel-lean running improves the efficiency. Run the engine fuel-lean, that is, use excess air. ![]() ![]() OVERCOMING ENGINE FRICTION AND PUMPING THE AIR AND FUELĪre we stuck with ~20% auto engine efficiency?
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