Factors affecting Specific Fuel Consumption - Measurable

[siva32]

We have conducted lot of experiments on large 4-stroke diesel engines to find out the parameters affecting Specific fuel consumption and we came to a conclusion that only charge air temperature and cooling water temperature can be controlled to reduce the SFC. But what I require is whether any experiments have been conducted and results obtained in measurable form (ie) for SFC drop of 1 gm/Kwhr how much reduction in Charge air temperature is required.

 

[EngineerBSME]

Perhaps the response has been limited because there is limited agreement with the conclusions from your test.
PV=MRT is the equation which describes the apparent result of your test. The colder the air, the more dense the air and thusly the more oxygen in the fuel air mixture.
Not surprisingly, adding nitrous oxide will oxidize fuel.

Wake up! The better the fuel air mixture, the better the efficiency. The mixture must be exact for each cylinder for each stroke. Not to be ignored or confused with the theoratical f/a mixture is the actual f/a mixture. Honda uses a vortex to improve the actual f/a mixture as compared to the theoratical f/a mixture.

Temperature is only one small part of the total equation. Air pollution is probably more important! Thusly, gas recirculation can be used to improve the efficiency at some conformise in instantaneous power.

 

[Rob45]

You figure out how to use exhaust gas recirculation to IMPROVE Diesel engine efficiency and reduce fuel consumption and you'll be a real hero.
As things currently stand, adopting exhaust gas recirculation in large truck Diesels is increasing fuel consumption by several percentage points.