oops, i forgot the OD in that formula, multiply the rpms times the OD ratio and
then
use the rest of the formula
ADvent@thuntek.net wrote:
> her ya go
> rpm /336/grXtrX2==mph
> gr=gear ratio
> tr= tire radius from center of hub to ground
> so, 2800 divided by336 divided 4.1 times tire raduis from hub to ground times
>2
> =54.88. the reason i say tire radius from the hub center to ground it the tire
> radius is shorter from the hub to ground that from hub to top of tire. the
> radius times 2 is much more acurate. you can reverse the formula to go the
>other
> way as well. this is for stanard trans or lock up torque converters only. for
> non lockup automatics use 356 instead of 336
> new mexico jim
> 51 two ton dump
> MLayton324@aol.com wrote:
>
> > RPM = V / D x GR x 334.2
> > Where:
> > V = vehicle speed in mph
> > D = effective tire diameter
> > GR = gear ratio (e.g., for my truck, 4.10 rear x .70 overdrive = 2.87)
> >
> > the above formula on the chevy truck sit does not seem to work out what am
> > i doing wrong
> >
> > 55 mph/ 27 inch tire is 2.03 2.03 x 4.10(gear ratio) x 334.2 equals 2781
> > which is supposed to be rpms at 55
> >
> > if i was only turning 2800 at 55 i would be estatic i cant even get it to
> > 55 without feeling like its gonna blow help??
> >
> > thanks mike layton
> > 50 3100
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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