One question guys about same. Can a single cylinder last as long as the multiple cylinder? Does engine life has anything to do with cylinders?

Hi Bikers,

I have been reading this thread, which started from single Vs multiple and in between relayed on to Torque and power outputs. I would just like to add something to it.

1) Torque and Power output, these figures are directly related to the Stroke/bore ratio. In simpler terms Lesser the ratio higher the Ps and lesser the torque. Higher the ratio lesser the PS and higher the torque.
e.g.

Duke 200 stroke/bore ratio is - 0.68 it gives 25BHP and 19 Nm of torque where as for P220 ratio is - 0.93 21 PS and 19.12 Nm. Also if we see for a Bullet 350 it is 1.28 and it gives 19 BHP and 28 NM. Also to some extent it is also dependent on engineering tech used for making engines. Hence a formula one car will have ratios in the range of 0.4 and Heavy duty engines will have it more than 1 limited to 2.

2) Some where in the thread i have read that >1 cylinders are more of free revving and produce higher PS at higher rpm. but the reality is as the engines rev on a higher side, more is the problems like floating Valve start arising. Hence it needs a lot more technological advancements like VVT (Variable valve timings). Which alas is not seen in Indian bike maker market. Also it may be attributed to higher the technological advancements higher the cost. That is the only reason you find a Ninja, Yamaha or a Honda engine be a more free revving than a bike like say Pulsar, bullet. Also correctly said rpm is also measured as feet/sec (Piston) and the highest to be measured is 5962 feet/sec by Honda. Believe me it is a technological marvel.

Also it is true that single cylinder bikes have more vibrations but can be reduces by proper balancing of crank, which for a twin or a 3 and 4 can achieve by simple pin offset.

An last but not the least. Refinement always comes with cost and this is the game every engine makers play keeping business in mind