I will tell you what I've turned and it fits Bobs description of 2 stroke 4 cycle. He can nod or ignore us as he is wont to do. :-)
The only place in engine calcs that stroke is a value is in Indicated Horsepower. ihp = PLAN/33,000.
Where:
- P
- mean effective pressure of exploded gases in psi
- L
- length of stroke in feet
- A
- area of cylinder in square inches
- N
- number of power strokes per minute
It goes on to say: In a four cycle engine an explosion takes place on alternate down strokes of each piston.
This means the crankshaft makes 2 revolutions for each power stroke.
Then if we are considering a four cylinder, four cycle engine, there will be 4 times 1/2 = 2 power strokes per revolution.
In an eight cylinder engine there will be 4 power strokes per rev. (end quote)
Nowhere else will a definition of stroke mean squat.
I know I have been in error, one that carries over from the 8 cylinder cars. They are truly 4 stroke.
Our favorite beastie is a 2 stroke 4 cycle in the engineering sense of the word. Knowing that I can calculate a value.
OTOH many of you will prefer to keep your definitions and that's OK by me.
west