Efficiency of a modern internal combustion engine

AI Thread Summary
The discussion centers on calculating the efficiency of a Volkswagen 1.6 litre FSI gasoline engine, which appears to show an unrealistically high efficiency of 99%. The calculations are based on fuel consumption at a constant speed of 100 km/h and power output at 3500 rpm, but participants argue that the method is flawed since it assumes full-throttle conditions that do not apply at constant speed. The typical efficiency of internal combustion engines is cited to be around 15-30%, with significant energy lost as heat. Participants suggest that to accurately assess efficiency, one must consider aerodynamic drag and actual power requirements rather than theoretical maximums. The conversation highlights the complexities of measuring engine efficiency and the need for precise data to avoid miscalculations.
  • #51
hxtasy said:
Just like topics on engineering, sciences, etc. - you should always find out for yourself as much as possible, the truth. The same with religion, trusting a pastor's word is like trusting your mechanic or doctor, just because someone is labeled a professional doesn't mean they are right. Find out for yourself.


Sorry to be off topic. This is an interesting thread though.

I want to see all the data. I haven't had an mpg gauge in one of my cars since my computer burned up in my '84 Impulse about 12 years back

I want to see L/100 km at full throttle and steady state speed at 10 mph increments from 30 mph to top speed with the gear noted.

Given this data, I will be able to determine the range of efficiencies of the motor.
 
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