How can a 1000cc engine from a motorbike produce 185hp but

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How can a 1000cc engine from a motorbike produce 185hp, but the average 2000cc engine from a car only produce between 130-150hp? seems silly to me! Why not take the 2000cc engine out of the car and replace it with an engine from a kawasaki ninja? surely the this would make all of our cars much more economical and improve performance!
  • 3200 day(s) ago by Steve Wright
Under: Suzuki GSX #Miscellaneous
31
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Hi,
Its a good question .Actually in the power to weight ratio does matter for overall performance. In Bikes the overall weight is much lesser than that of car and is designed for max of 2 persons ie around 150KG max payload.Also the simpler designs, absence of too many parts consuming the power is also reduced apart from the aerodynamic effect. Hence the 1000 cc engine of bikes wont give same effect in cars.
 

Posted: 3200 day(s) ago


Sasi Menon
Chevrolet
Spark
Owner
Dear Steve,
The fundamental reason that bike engines produce higher power is that they are very high speed engines, capable of revving past 10000RPM. A typical 185-200bhp bike engine develops that much power at redlines close to 10,000 to 12,000 RPM. Compared to that, a car engine produces 135bhp close to a redline of 7000RPM.
Maximum power from any petrol engine is produced at higher RPM, very close to its redline. In bikes, the engines are designed to rev much higher than cars and therefore, they produce much more power near the redline than car engines. One more thing to note; car engines produce much more torque than bike engines, since they have to have more pulling power for the weight that they lug. Therefore, outright power is compromised in favor of more torque. A bike has no weight, therefore the engines can afford to be built to rev higher and more power produced at a higher RPM, with not much torque.
Therefore, a bike engine in a car will not work, as it will not be able to pull the weight of the car, unless you rev it up very high and slip the clutch, which, in turn, is not good for the engine and gearbox.
 

Posted: 3200 day(s) ago

Mr Sasi Menon has answered GOOD.I wanted to inform the same but my predecessor has answered it beautifully. Always engine horse power or Brake Horse Power should be given at what speed of the engine and further Torque is also required to know further characterestics and at what RPM the Torque is maximum. In Diesel engines,the torque curve is almost flat,whereas in Petrol it is a steep curve and drops down quickly and further the Torque will mostly be less than a comparable Diesel engine of similar capacity.
Further Engines in Motor cycles are shaft driven like BMW or Chain Driven by two sprockets and through a close ratios of gears. Hence there is not much loss of power to the wheels as compared to propeller shaft and Hypoid rear axles and the differential which controls the speed of both the rear wheels. There is lot of wastage in friction at all these places and hence the required energy at the wheels is very much less and further the weight on each wheel is more.
Dr P C Rao, Consultant, PUNE 15 sept 09
 

Posted: 3200 day(s) ago


B S Kumar
You have two good answers. Please ignore the topmost post. That person is not an expert.
 

Posted: 3200 day(s) ago


JATT
Royal Enfield
Std
Owner
Thanx for asking this question and above all have answered very properly as motor bike engine has to give direct drive to rear engine through chain it is easy to turn the total torque produced by the engine to have more BHP with less amount of load on engine due to less weight.
And same engine if used for four wheeler it produces very less power as compared as it find heavy load on to turn the torque to carry the load.
Its very simple if u find some weight at back of any moving vehicle it carries it with full load.
 

Posted: 3200 day(s) ago


Rahul
None of the above answers are accurate and true. I suggest u to read about it online. And do see how bike manufacturers do it.. Coz same is the case with supercars.
 

Posted: 793 day(s) ago


Rahul

en.wikipedia.org/wiki/Stroke_ratio
 

Posted: 793 day(s) ago


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