----- Original Message -----
From: "Robert Diaz"
To: "John Cairns"
Cc: "John Cairns" ; "Eric and Amy" ;
dsn_klr650@yahoogroups.com>
Sent: Wednesday, October 24, 2001 7:49 PM
Subject: Re: [DSN_klr650] gas mileage, etc.
> Ahhhhhhhhhaaaaa! That would be key! Thank you Zen
> Master! LOL!
>
> --- John Cairns wrote:
> > Read it while imagining the voice of the scientist
> > guy from the Simpsons
> >
> > John
> >
> > 'Robert Diaz wrote:'
> > > Check out the big brains on John! J/K Sorry I
> > > thought that was really funny!
> > >
> > >
> > > --- John Cairns wrote:
> > > > The amount of drag on your KLR at this speed is
> > > > enormous.
> > > >
> > > > The power required to overcome drag and rolling
> > > > resistance may be
> > > > related by the equation:
> > > > P = R*v + Cd*v^3
> > > >
> > > > R = rolling resistance, maybe around 170.
> > > > Cd = Coefficient of induced drag, maybe around
> > .3
> > > >
> > > > That means that as your velocity goes up, the
> > power
> > > > required to
> > > > overcome drag increases by the cube of the
> > velocity!
> > > > In simpler
> > > > terms, It takes far more power to drive forward
> > at
> > > > high speed than it
> > > > does at low speed.
> > > >
> > > > Computing the power required for drag and
> > > > resistance:
> > > >
> > > > At 40 mph, v = 18 m/s:
> > > > P = 170*18 + .3*18^3 = 4.809 kW = 6 hp
> > > >
> > > > At 60 mph, v = 27 m/s:
> > > > P = 170*27 + .3*27^3 = 10.494 kW = 14 hp
> > > >
> > > > At 85 mph, v = 38 m/s:
> > > > P = 170*38 + .3*38^3 = 22.921 kW = 30.7 hp
> > > >
> > > > At 100 mph, v = 44 m/s
> > > > P = 170*44 + .3*44^3 = 33.035 kW = 44.3 hp
> > > >
> > > > Thats 44 horsepower just to overcome the drag
> > and
> > > > rolling resistance
> > > > at 100 mph. It will take alot more fuel to
> > power
> > > > the engine to
> > > > deliver 44.3 hp, than it would to power the
> > engine
> > > > to deliver 6 hp.
> > > >
> > > > Another problem that compounds all of this is
> > that
> > > > the engine
> > > > efficiency drops as your RPMs go above 6500.
> > The
> > > > KLR produces about
> > > > 35 kWatt, or 46 hp, at 6500 RPM. The engine has
> > to
> > > > consume even more
> > > > fuel to keep up with the demand as you go above
> > 65
> > > > or 75 mph.
> > > >
> > > > The optimum mpg is probably somewhere around
> > 55-65,
> > > > before you start to
> > > > consume excessive amounts of energy to move the
> > > > vehicle, but in the
> > > > rpm range where your engine is most efficient
> > > > 4000-6500!
> > > >
> > > > I'm sure this number is not an accident on the
> > part
> > > > of the designers...
> > > >
> > > > John
> > > >
> > > > 'Eric and Amy wrote:'
> > > > > Question for anybody who does 85mph+
> > continuously
> > > > for a full entire
> > > > > tank of gas on a newer KLR650. How is your
> > gas
> > > > mileage at those
> > > > > speeds?
> > > > > On 3 separate occasions, on my way through LA,
> > and
> > > > TX, I had to
> > > > > switch to reserve at 175 miles. Usually i get
> > to
> > > > at least 250miles
> > > > > under normal everyday driving. I was riding
> > into
> > > > the wind, and it
> > > > > seemed that 85mph was almost full throttle.
> > Also,
> > > > the engine kept
> > > > > choking at that speed, almost like i would let
> > off
> > > > the gas real quick
> > > > > then crank it again. This was very
> > intermittent,
> > > > and only happened a
> > > > > few times.
> > > > > Also, the KLR seemed to lose noticeable power
> > as i
> > > > came thru
> > > > > Amarillo, NM, and up 25 from Trinidad. It is
> > > > jetted for high
> > > > > altitude, even though it did I havent ridden
> > > > since i got home last
> > > > > week, but i did clean the air filter (not that
> > > > bad) and replace the
> > > > > spark plug. i guess i will see what happens.
> > > > >
> > > > > I just found out that i may not be able to
> > ship my
> > > > KLR AND my Ford
> > > > > Exploder to Turkey... Hmmm. I wonder if they
> > have
> > > > used ones i could
> > > > > buy when i get there?? Anybody ever been
> > there?
> > > > (Adana/Incirlik AB)
> > > > > Do i really want to pay $120ish /month for 2
> > years
> > > > while it is in
> > > > > storage here? Anyone interested in purchasing
> > ? I
> > > > dont think i will
> > > > > be able to survive without her.... I will
> > have to
> > > > find out for sure
> > > > > what the deal is, but a guy here just got back
> > > > from there, and they
> > > > > said he couldnt bring his bike and a vehicle.
> > It
> > > > would cost me $1500
> > > > > ish to ship it there and back, and another
> > $1500
> > > > to register it.
> > > > > Crazy. So many questions, so little time.
> > > > >
> > > > > Eric. CO Springs
> > > > > 01 KLR650 8000K
> > > > >
> > > > >
> > > > > Checkout Dual Sport News at
> > > > >
http://www.dualsportnews.com
> > > > > Be part of the Adventure!
> > > > >
> > > > > Visit the KLR650 archives at
> > > > >
> >
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> > > > >
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> >
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> >
> > > > >
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> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > John Cairns
> > > > john@...
> > > >
> > >
> >
> 3.14159265358979323846264338327950288419716939937510582097494459228...
> > > >
> > > > Checkout Dual Sport News at
> > > >
http://www.dualsportnews.com
> > > > Be part of the Adventure!
> > > >
> > > > Visit the KLR650 archives at
> > > >
> >
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> > > >
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> >
> === message truncated ===
>
>
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