cc to HP

[freakboy]

No,

rpm doesn't measure how many times it fires, it measures how many revolutions the crank does. a 4-stroke spinning at 5,000rpm is going the same speed as a 2-stroke at 5,000rpm.
The 4-stroke however is only firing 2,500 times per minute, whereas the 2-stroke is firing 5,000 times per minute.

ok that makes twice more sence!

 

[brendonv]

a two stroke doing 10,000rpm is the same as a 4 stroke doing 10,000rpm. A two stroke fires every stroke though so its getting more power out of each stroke so it will have more grunt then a 4 stroke. A 4 stroke only fires every 2nd stroke so that one explosion has to push it around twice. Theres nothing saying a 4 stroke has more power at low rpms. If a two stroke has an expansion chamber theres not real reason why it will have less torque at low rpms.