afzal

More cc or bhp

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Hello friendssmiley1.gifsmiley1.gifsmiley1.gif

 

I'm confused a bit in this  topic as Pulsar200cc has 18bhp while Karizma225cc has 17bhp or Royal Enfield 350 also has 18bhp which one would have more power,pickup and top speed?

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You must please read thoroughly the road tests conducted by a reputed magazine on the bikes you may have shortlisted. The acceleration figures 0-60 kmph/0-100 kmph/ power to weight ratio/ torque and the top speed figures. The bhp or cc are important and so is  the power to weight ratio.Please go into the technicalities and do a thorough research  before arriving at a decision. Your personal needs from a bike and choice of make are the most important of all.

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You are right in assuming that cc and bhp should correlate but they do not. Depending on the nature of the engine, its peak rpm, cam profile etc. the output of a smaller engine can be higher than that of a larger engine. For similar power output one can say that the larger engine will in general have a wider power band, and thus be easier to drive, and more suitable for long distance driving. The smaller engine is likely to be 'peaky' but normally more economical. 

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Power = torque*rpm .

CC and power can be related by gear ratios

Yes power is torque * rpm, but power has nothing to do with the gear ratios (they do not come into the equation). You are getting confused by the response of the vehicle, which will be better if the gearing is 'short'.

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The gear ratios take an essential part in delivering power @sgiitk .

CC is directly proportional to power with gear ratio as constant for proportionality (i.e. short or long gearing).

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Sorry. Power is measured at the crankshaft and not at the wheel.

Added:

It could be DIN: ie.e, taking into account water pump, alternator etc. or SAE: output of engine with not accessories.

sgiitk2008-02-11 05:32:22

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The engine with the best torque spread will have the best in-gear acceleration, and given identical gearing and wheels, the engine with the highest power output figure should have the highest top speed. Everything else is a grey area.

In the case of the bikes you've mentioned above, the Bullet will have the most torque but doesn't rev too much. The Karizma is relatively modern, but still is a long-stroke motor, therefore the good spread of torque but relatively low redline and the Pulsar is oversquare, hence the high rev limit but short gear ratios.

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