2006-06-05 16:53:21 · 5 answers · asked by amrita_dinakar 1 in Science & Mathematics ➔ Engineering
The theoretical maximum efficiency of any heat engine (petrol, diesel, jet, rocket, steam, stirling etc.) is (input temperature minus output temperature)/ output temperature where these are absolute temperatures; that is celsius plus 273 degrees. Input temperature is the hot part of the engine (the cylinder) and output temperature is the exhaust manifold temperature. So the most efficient petrol engines have efficiencies of about thirty something percent.
2006-06-05 17:16:07 · answer #1 · answered by zee_prime 6 · 1⤊ 0⤋
Mechanical Efficiency Of Diesel Engine
2016-12-11 17:54:09 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Mechanical Efficiency is around 80%. People here, confused Mechanical Efficiency with Thermal Efficiency which is around 30%. Mechanical Efficiency is given by Break Mean Power/ Indicated Mean Power. Where BP - IP = Friction Losses in Power.
2015-08-06 05:19:35 · answer #3 · answered by Sibasish 1 · 0⤊ 0⤋
it is around 50-60 for petrol engine
and around 38 to 50 for diesel engine
you will all the stuff about internal combustion engines below
2006-06-05 17:22:52 · answer #4 · answered by alooo... 4 · 0⤊ 0⤋
about 40% for a deisel engine
about 30% for a petrol engine.
So every dollar of fuel put into your car, 60 cents plus is wasted...
incredible eh!!!!
By the way.. a good steam engine can be 90+% efficient!!!
2006-06-05 20:41:57 · answer #5 · answered by simsjk 5 · 0⤊ 0⤋