How Do Bikes Rev So High

How can motorcycles rev so high.

How do bikes rev so high. Depending on the motorcycle engine you are talking about. Why some engines rev high and their benefits. Power is a function of torque and rpm. A high revving i4 like you would find in a 600cc sports bike has 150cc cylinders.

Paras the primary reason for bikes to have high revving engines is lack of torque. The small capacity bikes make piddly amount of torque so they need to rev high to produce decent power. From formula 1 to the mazda rx 8 from the s2000 to sport bikes high revving engines have stolen our hearts and our hearing. Why do sport bike engines rev so high.

And since a one liter engine has a heavier crank and connecting rods and pistons that limit is lower than than the limit on an engine with lower weight parts. Now formula 1 race care also have a short stroke. Because they need to to have the power to travel at those speeds don t forget that your bike has an engine capacity of 0 6 of a litre and still has four cylinders so thats only 0 15 of a litre per cylinder which is less than half the size of even a small car engine s cylinders. 9 of the highest revving four stroke bikes in the world duration.

Harley s have about the same stroke as the average car engine so they usually rev to about 5500 rpm. Even if you shortened the stroke and increased the bore of the car engine the pistons would be much larger and much heavier than the pistons in the bike so the car engine would still have higher stress for the same rpm. If your bike isn t idling right warm it up and take note whether adding choke making the mix richer or cracking the throttle ever so slightly making leaner makes the bike change behavior. Engines with a short stroke length the piston travels within the cylinder will wind out to a much higher rpm.

Those parts are balanced pretty well which is why they can rev so high to begin with but there s still a limit to how high it can rev without coming apart.