At 01:24 PM 2/19/99 -0500, you wrote:
>In a message dated 2/19/99 12:22:26 PM EST, bmbl-b1@home.com writes:
>
>> n a 3.55 gear ratio the drive shaft turns 3.55 times for every 1 turn
>> of the axle hope this helps
>>
>DOH! I knew I should have proof read before I posted.
>So the gears in the 518 trans cycles one time to turn the drive shaft 2.45
>times which turns the axle 8.70 times
>And the 500 trans cycles once to turn the drive shaft 2.74 times and so forth.
>Assuming my correlation of the trans gear ratio is right.
>
>1rev.->2.45 revs.->8.7 revs.
>1rev->2.74revs->9.73revs
>or
>2.45 revs->1 rev.->3.55revs.
>2.74 revs->1 rev ->3.55revs
>I'm just confusing myself now (see how easy it is).
>Boog
Now I'm confused! ;-)
If it helps, here's one way to think of it:
Whenever you encounter a ratio (rearend or tranny), the second number
in the ratio (usually a 1) is for the part closer to the road, and the
other number (the first number) is the part closer to the engine.
So, when you consider a 3.55:1 rearend ratio, the axle or tires are
closer to the road, so they're the second number. They spin once.
The first number is closer to the engine, so we're talking about the
driveshaft; it spins 3.55 times. So, the driveshaft spins 3.55 times
for every 1 turn of the wheels.
Same deal for the tranny. if you've got it in 1st, and that ratio is
2.45:1, the 1 is closer to the road (driveshaft) and the 2.45 is
closer to the engine (flywheel/crank/whatever). The engine turns 2.45
times for every 1 turn of the driveshaft.
In the above scenario, in order to turn the wheels once, you have to
turn the driveshaft 3.55 times. In order to turn the driveshaft once, you
have to turn the engine 2.45 times. So, to turn the wheels once, the
engine has to turn 8.7 times. (2.45 * 3.55)
If you ever get confused, think of a transmission. The first gears
have relatively high numbers 4:1, 3:1, 2:1, etc. Fourth gear is
usually 1:1. Fifth or overdrive is smaller than one. (.75:1, for
example) As you go through the gears, your speed goes up (your tires
turn faster) at the same RPMs. So, if a first gear of 4:1 meant
that you were turning the driveshaft 4 times for every 1 turn of
the engine, and you shifted into a 2nd gear of 3:1, that would mean
you're now only turning the driveshaft 3 times for every turn of the
engine. That can't be, since that would make you go slower; it must
be the other way around. (and it is) :-)
Also, it may help to think of a bicycle. In 1st gear, your legs
pump the pedals around really fast, but the wheel doesn't move much.
You might have to pedal around 4 times for the wheel to move once
(4:1). As you shift to higher gears, you might pedal around once
for one rotation of the wheel (1:1) or the rear wheel might even
go around once for every half pedal. (.50:1)
-Jon-
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