Engine Tuning to Reduce Fuel Consumption
The adjustment, modification or design of internal combustion engines to yield better fuel economy.
In a normal internal combustion engine 23% of the energy that comes in as fuel appears as useable output.
In terms of the energy input, 35% appears as Indicated Power, 30% goes into the cooling system and 35% goes down the exhaust.
The losses in the engine:
- Air Pumping (6%)
- Seals (0.5%)
- Bearings (1%)
- Valve Train (1.3%)
- Piston Assembly (2.8%)
- Viscous Loss (1.35%)
- Friction Forces (0.95%)
- Blowby (0.5%)
- Other Engine Friction (0.4%)
Roughly 10% of the energy input is lost in friction in the engine.
George Fenske, Robert Erck, Layo Ajayi, Ali Erdemir and Osman Eryilmaz, "Parasitic Energy Loss Mechanisms Impact on Vehicle System Efficiency", Argonne National Laboratory