Quote:
Originally Posted by Frank Lee
Speaking of engine efficiency, I still don't get why the efficiency of the world's most efficient ICE, a huge MAN two-stroke diesel, is not scale-down-able.  |
Hi Frank Lee,
For a start, the displacement, a bunch of cylinders: volume is like pi * r**2 * h, so displacement is proportional to the square of the bore. Where does the heat go? Some pushes down on the piston, some goes out the exhaust. And a bunch goes through the cylinder walls to the radiator. So how do cylinder walls scale? Like the area of the cylinder: 2 * pi * r * h. So the cylinder wall area scales linearly with the cylinder radius.
OK?
-mort