general tech question - Kawasaki
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post #1 of 1 Old 05-17-2004, 01:37 PM Thread Starter
Join Date: May 2004
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general tech question

it's said that sport bikes may be tame at low revs , but once in their powerband they are wild tigers .they also say that acceleration past the peak power RPM is blazing quick . Let's say of the R1 , it makes [email protected] , max torque [email protected] , so magazine articles and riders say that the best acceleration only occurs after 10000RPM which is after the peak torque RPM . Note that the older R1 does not have RAM air either .

Alan Cathcart once was praising the Bimota SB6R for its performance after 10500RPM to 12000RPM ( speaking of some turbo like effect bteween 10500 and 12000 ), the SB6R makes peak power 145hp at 10000RPM .

Now from physics we know that acceleration is the result of force or torque . So in every gear , the bike accelerates hardest at its peak torque , so why do magazine articles keep raving abt high acceleration past peak power RPM ? Having seen several power/torque curves , it's apparent both torque and power drop afte the peak power , so why is it that so many big bikes are said to have their best performance after the peak power RPM .
RAM air adds only a few hp and air resistance at high speeds means small increase in torque is hardly enoug to counter the exponential increase in drag force .

so can anyone explain why is it said that real performance only comes at and after peak power RPM ?

And I notice that most sportbikes have no overdrive , even 6th gear is not . Why is that ? If overall 6th ratio is same say 5.5 , using different reduction ratios one an overdrive other not overdrive , then does having overdrive or non-overdrive gear ratio make a difference ?

thanks ,
Ricci is offline  
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