Honda Pacific Coast ipcrc Archives

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First Ride on my 96 Pacific coast
Written by revconprince on 3/12/2012 at 05:45 pm

Yes, that is exactly what I am looking at. I fully acknowledge the torque
multiplication of the transmission, resulting in more force applied at the rear
wheel, when one can use lower gears. But if you are running the RPM up in a
single gear, the force applied to the rear wheel will be the same from 2000 to
6500 RPM. If you are trying to accelerate hard, you will run it out to redline
before you shift, taking full advantage running in a lower gear as much as
possible. In contrast, most motorcycles have a large blip in the torque curve up
in the top end, where if you are accelerating in a single gear, when you hit the
upper end, you feel a significant change in pull, or increase in pull. The PC
does not do that.

You have to be careful in how you interpret HP. HP assumes that the gear ratio
is optimum at all vehicle speeds. The only way for that to be true would be with
a CV type trans. Otherwise you are limited by the number of different ratios in
the trans, ie number of gears and how closely spaced they are. If you look at
the HP curve, you are assuming the power continually increase as the engine RPM
increase, but the reality is, you are applying the same amount of force on the
drive wheel across the whole RPM band unless you shift.
Dave

--- In ipcrc@yahoogroups.com, "goldwingman40" <goldwingman@...> wrote:
>
> Dave,
> You better take another look at the dyno curves for the PC.
>
> http://www.fortunecity.com/silverstone/pantera/936/dyno.html
>
> At 1500 rpms you have almost no power and torque, not "gobs", 5 HP and 10
ft-lbs. "The power curve is nearly ruler flat between 2 grand to 6.5K" is not
correct. The power curve is horsepower not torque. The torque curve is nearly
flat between 2000 and 6000 rpms but the power curve is a steady climb from 2000
to 6000 rpms with it doubling from 2000 to 4000 rpms, 15 to 30 HP, and
increasing another 15 HP from 4000 to 6000 rpms. Torque helps but power moves
the bike and the power needed to move the bike is not a straight line function
increase vs speed but increases as the square of the speed which the bike power
does not so the acceleration drops off as the speed goes up.
>
> Fred
>
> --- In ipcrc@yahoogroups.com, "revconprince" <daveinet@> wrote:
> >
> > I keep hearing this statement and trying to figure out where is comes from.
The power curve is nearly ruler flat from 2 grand to 6.5K. It increases by NO
MORE than 3 ft-lbs between those RPMs. Its got gobs of low end torque. While
there is some gain from staying in lower gears as a result of torque
multiplication, the bike has gobs of low end. Its not uncommon to roll the
throttle on from 1500 RPM in third or fourth gear.
> >
> > --- In ipcrc@yahoogroups.com, "goldwingman40" <goldwingman@> wrote:
> >
> > > The power band of the PC is 4 to 6.5 k rpms, here is a link to the dyno
curves. The power is low below 3k rpms and if you like good response it is 3.5 k
or above.
> >
>