Hi John and All,
--- "John G. Lussmyer" <[EMAIL PROTECTED]> wrote:
> At 01:48 PM 10/6/2002 -0700, jerry dycus wrote:
> > If you replace them with other lighter batts
> and
> >have any space to spare left, take the aft most
> batt
> >weight out. These aft 2 or so batts hurt the
> stability
> >so by making them lighter or moving them forward
> would
> >partly make up for the less stability lost to the
> >lesser weight of the new batts.
> > If you could use that space to move your seat
> >down would help too.
>
> There are 7 batteries under the seat, so lowering
> the seat isn't
> possible. (Heck, if I want to use Saft NiCd's, I'd
> have to raise the seat
> an inch or so.) Moving weight forward may be
> difficult as well.
I was thinking that li-ion batts being smaller you
would have so room left even doubling your range.
You'd only need one batt space to be able to drop the
seat.
>
> > > They are getting a rest this week, as I have to
> > > replace the rear axle
> > > bearings in the Sparrow.
> > You may have your gates polychain belt too
> tight.
>
> This does seem to be a common problem with Sparrows.
> The belt may be too
> tight, I can't check right now as everything is
> taken apart. It doesn't
> help that Corbin didn't put any way to adjust belt
> tension on the car.
Not Good. I'd oval out the motor mount holes if
it's too tight.
Can you make it ajustable?
> This may be somewhat driven by the very small front
> sprocket. It has only
> 24 teeth, vs the 135 on the rear sprocket. I wonder
24 teeth sould give you good life in a Sparrow,
well within it's spec's. Now the 22 tooth sprocket
will reduce life but it's still like 5 years even then
if tensioned right. Though it's usually the bearings
that give out first, second, third, ect, ;-) .
A 135 tooth sprocket would be 13.5" dia, # of
teeth/10 = dia in inches I noticed for 8mm belts,
that's big?
> if the standard
> tension on the gates belt wasn't tight enough to
> keep the front sprocket
> from slipping and grinding up the belt when starting
> from a dead stop.
If it skips it's too loose!!! They only need 3
sprocket teeth in full contact with the belt to give
full rated power.
It would have to be very loose looking for that to
happen.
If this is happening with Sparrows it points to
bad production methods. The correct setting should be
done at the factory and never need changing again. But
if bearings are breaking, bet on a too tight belt.
If one of the sprockets are out of round by only a
little bit, 1/16", and the belt is tight it will be
like a hammer every rev. Another reason not to have
the belt bar tight. Check by turning the wheel while
watching the belt for tightning. There should always
be some curve.
>
> >Also for others using
> >polychains is you can't use an idler with them.
>
> Just curious, why not?
It interferes with the centrifical force that
tightens the belt. Also adds drag, shorting belt life
by another bend, idler bearings. Since the belt
doesn't stretch, an idler isn't nessasary to keep
tension like chains need because chains stretch.
jerry dycus
>
> --
> John G. Lussmyer mailto:[EMAIL PROTECTED]
> Dragons soar and Tigers prowl while I dream....
> http://www.CasaDelGato.com
>
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