Long Stroke vs. Short Stroke

[John Pavlick]

Adam,
 Exactly. Harleys don't rev as high, but they don't need to. The Sporty gets
70 Hp (actually that seems a little high for a 74" Harley) at less than 5000
RPM. The Yagasaki needs to wind about twice that. Imagine going 45MPH and
passing a truck, going up a hill, with a passenger on the back. Which one
could do it in "top gear" (even with the weight disadvantage)? Don't forget,
a Sporty has a relatively short arm (stroke) for a Harley. Did you ever ride
something with 5" of stroke? It really doesn't matter how much horsepower
the dyno shows it to have. Torque talks. Especially if you don't shift
properly. Area under the curve works on the street - even if the curve isn't
as steep. That's what makes a 4-stroke feel so nice in a pattern plane. Or
not - depending on who you talk to. I wonder why they stopped making the
long stroke 2C motors?

John Pavlick
http://www.idseng.com



> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of Adam Glatt
> Sent: Sunday, February 06, 2005 10:06 PM
> To: discussion at nsrca.org
> Subject: Re: Long Stroke vs. Short Stroke
>
>
> 2005 Suzuki GSXR 1000 (1000cc)
> 164bhp
> weight ~186kg
>
> 2005 Harley-Davidson Sportster (1200cc)
> 70hp
> weight  ~250kg
>
>
>
> John Pavlick wrote:
>
> >Scott,
> > To take things a little bit out of context: a Harley Davidson would be a
> >"long stroke" and a Honda or Kawi or Yamaha would be a "short stroke". If
> >you've ever ridden a Hog and a Jap bike - you'll know the difference. The
> >old O.S. SF 61 was a long stroke and they could turn a pretty large prop.
> >The Y.S 61 LS was the same idea.
> >
> >John Pavlick
> >http://www.idseng.com

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