I'm technically a child of the eighties (Jan 1980 DOB)... line is from
"Stripes" Mr Psyco needs to ligten up or Ill Kill you!.
Toby
> Ah.... A child of the eighties. I bet less than 1 in 1000 kids younger
than 18 can identify that line...... In ten years, 1 in 1000 younger than
18 will be able to identify the _biggest_ actor in the movie. Folks, I'm
getting old.....
>
> Michael
> '78 Midget (I'm sorry, did you want me to move on my own power?)
>
>
> Dan Dwelley <maine2me@yahoo.com> wrote:
> > "Lighten up Francis!" Sounds like someone needs a hug!
> :o))
>
> I was just being Facetious!
>
> Damn!
>
> Dan Dwelley
>
> --- John Holliday wrote:
> > If we are going to continue this anal discussion,
> > the
> > rolling circumference of the tire with the car's
> > weight applied is different than the circumference
> > measured on your spare tire off of the car.
> >
> > Better still just top end your car's speed thru your
> > local community's speed trap. Email us a copy of the
> > citation and we will all know who's is fastest.
> >
> > John Holliday
> >
> >
> > --- Dan Dwelley wrote:
> > > > Mark a spot on one rear tire and roll the car so
> > > the
> > > > mark touches the
> > > > pavement. Mark the pavement at this point. Roll
> > > the
> > > > car forward with you in
> > > > it (for highest accuracy) until the mark on the
> > > tire
> > > > is again on the ground.
> > > > Mark this spot and measure between them. This
> > is
> > > > the distance the car moves
> > > > forward for each rotation of the axle, call it
> > > "C".
> > > >
> > >
> > > "C" for Circumference? I've got a better
> > idea...just
> > > measure the circumference of your spare tire (if
> > > it's
> > > the same size as you have on your car). I bet
> > you'll
> > > get the same measurement with less effort! :o)
> > >
> > > Dan Dwelley
> > > no wiz but I can determine the circumference of a
> > > circle and apply it to linear measurement. :o)))
> > >
> > >
> > > --- Glen Byrns wrote:
> > > > Here's how I figured my theoretical speed at
> > > various
> > > > rpm's:
> > > >
> > > > Mark a spot on one rear tire and roll the car so
> > > the
> > > > mark touches the
> > > > pavement. Mark the pavement at this point. Roll
> > > the
> > > > car forward with you in
> > > > it (for highest accuracy) until the mark on the
> > > tire
> > > > is again on the ground.
> > > > Mark this spot and measure between them. This
> > is
> > > > the distance the car moves
> > > > forward for each rotation of the axle, call it
> > > "C".
> > > > In my case, C=69 5/8" =
> > > > 69.625".
> > > >
> > > > With a 4.2 rear end, the drive shaft will turn
> > 4.2
> > > > times to turn the rear
> > > > axle one revolution. Assuming a fourth gear
> > ratio
> > > > of 1:1, then at 6K rpm,
> > > > 6000/4.2 = turns of rear tire per minute =
> > > 1428.72.
> > > > Multiply by 60 to get
> > > > turns per hour, = 60 x 1428.720 = 85732.2
> > > > This number times the number of inches forward
> > for
> > > > each turn you figured out
> > > > earlier(C)tells you how many inches forward for
> > > each
> > > > hour at 6k rpm in
> > > > fourth. Divide by the number of inches in a
> > > > mile(63360) and you should get
> > > > miles per hour.
> > > >
> > > > {(rpm/rear end ratio)x 60 x C }/ 63360
> > > >
> > > > So for a 4.2 rear end, 69.625 inches per turn of
> > > > tire, fourth gear:
> > > > (6000/4.2) x 60 x 69.625 / 63360 = 94.18 mph,
> > at
> > > 5k
> > > > rpm = 78.49mph
> > > >
> > > >
> > > > I'm sure someone with a better memory of math
> > will
> > > > correct me, but luckily I
> > > > play with DNA for a living and don't do gobs of
> > > > math.
> > > >
> > > >
> > > >
> > > > > I havn't seen anybody talk about tire size
> > which
> > > > can have a very difinite
> > > > >effect on speedo error and correct top speed.
> > > Look
> > > > at any tire chart and
> > > > >you will see a big difference in tire
> > > circumference
> > > > with the tires sizes
> > > > >very close together if not the same size.
> > Don't
> > > > forget to take this into
> > > > >consideration. Does anyone one out there have
> > > the
> > > > formula for determining
> > > > >top speed using tire circumference, axel
> > ratios,
> > > > and rpm's?
> > > > >
> > > > >
> > > > >BOB
> > > > >65 Midget vintage racer
> > > >
> > >
> >
> >________________________________________________________________________
> > > > >
> > > > >
> > > > Regards,
> > > > Glen Byrns
> > > > '59 Bugeye
> > > >
> > >
> > >
> > > =====
> > > Dan Dwelley
> > > 77 Midget
> > > Alexandria, Va.
> > >
> > > __________________________________________________
> > > Yahoo! Photos -- now, 100 FREE prints!
> > > http://photos.yahoo.com
> >
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Photos -- now, 100 FREE prints!
> > http://photos.yahoo.com
>
>
> =====
> Dan Dwelley
> 77 Midget
> Alexandria, Va.
>
> __________________________________________________
> Yahoo! Photos -- now, 100 FREE prints!
> http://photos.yahoo.com
>
|