The key to the improvement, economy and safety of the lean-engine lies in increasing the compression ratio. The so-called lean-motor exhibits primarily only one component of the thermodynamically optimised engine. This optimisation includes an increase in compression, changes to the combustion chamber shape with intensive turbulence in the charge, in addition to retaining the optimum values for ignition timing and fuel-air-ratio at every point in the operation of the characteristic field. With an existing engine construction there is the possibility, by relatively simple measures, of thermodynamic optimisation to reduce the fuel consumption by up to 30%. Previous attempts to reduce fuel consumption and exhaust fumes have shown that there are many reserves available to improve low speed behaviour and simultaneously be able to maintain a high specific performance. POSSIBLE WAYS OF REDUCING FUEL CONSUMPTION IN 4-STROKE INTERNAL COMBUSTION ENGINES WITH A HIGH SPECIFIC PERFORMANCE MOEGLICHKEITEN DER VERBRAUCHSVERRINGERUNG BEI OTTOMOTOREN HOHER SPEZIFISCHER LEISTUNG
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