Quote:
Originally Posted by Libor
Hey, nothing wrong with being a bit Narcissistic 
This topic went to much from its track and I already really donīt know what is being argued.
Rice is right in everything he said. Some people may take it to personally, that he suggesting that 13B has capacity of 3.924 L, when everyone and his mother knows, that 13B is 1.308 L.
Byt why arguing?
This keyboard war doesnīt change fact, that 13B is fully and without any artificial factor comparable to:
1.3 L two stroke
2.6 L four stroke
Should I post calculations of engine power, torque, BMEP etc.? Which clearly states that number of power pulses per time or revolution is essential?  |
You are talking "equivalences and similarities" in relation to different styles of internal combustion engines... not Physical Displacement per revolution of the crankshaft.
The reason a rotary is comparable to a 1.3l 2 stroke is that it fires its full displacement each revolution.
The reason it is comparable to a 2.6l 4 stroke is because it separates the strokes and ignites the "equivalent" amount of displacement as a 2.6l 4 stroke each revolution.
But using your logic, a 2.6l 4 stroke is comparable to a 1.3l 2 stroke, and a 5l 2 stroke is comparable to a 10l 4 stroke. The fact of the matter is they are different types of ICE's, which means they will have differences and similarities. Doesn't change how displacement is calculated.
If 2 stroke versus 4 stroke changed how displacement was measured, then you better let the engine industry know they've been doing it wrong. lol. a kx500 is in fact a 500cc 2 stroke engine, but it you changed the ignition and head to a 4 stroke system... would that automatically make it something else? No. the bore area and stoke didn't. it still displaces 500cc in one crankshaft revolution. Tis is how it is done.
I honestly don't see the argument here.
Even in your examples: "engine power, torque, BMEP" is not used at all in calculating displacement. Guess what it is used for? Taxation and racing classes, to even the playing field.
And "power pulses per revolution" again has nothing to do with displacement. If it did, then a 500cc 2 stroke engine would only be a 250cc 4 stoke engine. But, this is inherently incorrect, as again, the stroke (distance of piston vertical travel) and bore area did not change.
Please don't take this post as an attack, but as you said, a 13b is just that. a 1.3l. while it may share similarities with different sized engines due to its type, it is still just a 1.3l. Under no standardized definition of internal combustion engine displacement will a 13 be anything other than 1.3l. Similarities do not change how physical displacement is measured.
Remember, displacement is derived from a constant that all of the mentioned engines share: The crankshaft/centershaft/eshaft rotation is used to transfer power from the engine to the rest of the drivetrain. This is the reason displacement is measured by one rotation/revolution of this crankshaft/centershaft/eshaft.