Quote:
Originally Posted by Rifleman
8 lbm = 1 Bhp.
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That's not a universal rule. It works perfectly if the rider + bike = 800 pounds, and the motor makes 100 hp. At that ratio, adding 8 pounds (1%) is very close to accelerating with 1 less hp (also 1%). Or losing 8 pounds is like gaining 1 hp.
But if you take a motogp bike that weights 350 pounds, a rider at 150 pounds (total weight 500 pounds), and a motor making 250+ hp, it's a little different.
If you add 8 pounds, it's a 1.6% penalty. Multiplied against that 250 hp, it's like losing 4 hp. So in this case a gain or loss of 2 pounds = a loss or gain of 1 hp.
For ninjettes, let's start at 370 pounds, 150 pounds rider for total of 520 pounds. 25 hp in round numbers. If you add 8 pounds, it's a 1.53% penalty. Multiplied against 25 hp, it's like losing .38 hp. So in this final case, a gain or loss of 21 pounds = a loss or gain of 1 hp.