tires of 815 rev/mile (stock 14" tire)

1 x 4.09 x 815 axle revs/mile = 3333 engine revs/mile

60 mph = 1 mile/min

3333 engine revs/mile X 1 mile/minute  = 3333 engine revs/minute

Don't know what the slippage factor would be for the auto tranny but the
rpms would be 3333 or more at a true 60 mph with stock size tires

'Stock' 14" tires can vary slightly rev/mile, by + or - 10 or about 1%.

Mark

Michael Elliott wrote:

> This is doubtless in the archives but I can't find the right keywords to
> unearth it.
>
> I'd like to check my tach's accuracy. With the NH type automatic
> transmission (1984 Vanagon), what the math to find what I should expect to
> read on the tach if I'm doing 60mph?
>
> Second, if a train departs Grand Central Terminal at 2pm and heads west
> at 52 miles per hour, and another train leaves Chicago at 4pm heading east
> at 62 mph, what day of the week is it?
>
> --
> Mike "Rocket J Squirrel" Elliott
> 71 Type 2: the Wonderbus
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> KG6RCR
>