hmm.. lemme correct a few typos..
On Oct 21, 2008, at 1:58 PM, Lester wrote:
> Maybe this is a matter of semantics...
>
> True, the motorcycle "absolute top speed", for lack of a better
> term, is limited by drag and HP.
>
> However, for a motorcycle with a top speed limited by gearing or
> limited by engine revs then a larger diameter tire will allow for a
> higher top speed ALTHOUGH this top speed may not be the "absolute
> top speed" limited by drag.
>
> For example a 20 hp bike motor that will turn 6000 revs (and
> pretending that the tranny is direct drive) will turn the tires
> 6000 revs.
> If those are 10 inch circumference tires then the bike will go
> speed x,(no, I'm not going to calculate it out.) but if you replace
> those tires with 20 inch circumference tires then the bike will go
> twice as fast *** IF *** the bike has not reached is theoretical
> drag-limited top speed and that the engine can turn the 20 inch
> circumference tires at 6000 revs.
>
>
> Lester
>
> On Oct 21, 2008, at 1:06 PM, Weslake1330@aol.com wrote:
>
>> Not so.
>>
>> Top speed is limited by aerodynamic drag and BHP. To go faster
>> you need
>> less drag or more bhp or both.
>>
>> Acceleration on the other hand is limited by lb/f torque to weight
>> ratio (to
>> the point where the drag is greater than bhp and limits top speed and
>> therein acceleration).
>>
>> The motorcycle has less drag than a car (less frontal area really)
>> so needs
>> less bhp to reach its maximum speed. The wheel diameter is
>> neither here nor
>> their because the gearing controls the gearing and the wheel
>> diameter is just
>> one factor.
>>
>> W e s l a k e 1330
>>
>> In a message dated 21/10/2008 18:15:47 GMT Daylight Time,
>> bmwwxman@gmail.com
>> writes:
>>
>> Fact
>> is, BHP or HP by any measure really has nothing to do with speed.
>> Only in
>> elapsed time to reach a given speed. I have seen a 20 HP
>> motorcycle reach
>> 110 mph because of its wheel diameter and gearing. Likewise, I
>> have seen 200
>> HP V-8s that couldn't hit 90 MPH.
>>
>> Cheers!!
>> Jim
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