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[FlyRotary] Re: Dodge vs Ford
Ken,
Some additional info!
I look at the planetary as I look at a external
toothed gear engaged to a drive gear.
The smaller drive gear has to travel (
with the E4D) 2.85 times further than the larger gear ( the larger
gear has 2.85 times additional teeth).
The planetary gears ( in my mind ) merely transfers
the loads. Their not involved with varying the Ratio!
No matter how it's used in a Vehicle/ Truck,
we will use it the same as we use the other planetaries, so the assessment
is the same as the other planetaries.
So I'm figuring that the ring gear must be about 84
for the ring gear and about 38 for the sun gear e.g. 84/ 38 = 2.21 +1
=3.21
If you can give me the tooth count we can evaluate
from there - no pressure and no confusion.
George ( down under)
Ken,
The ratio is ring gear tooth (numbers) divided
by sun gear teeth( numbers).
If drive is taken out of the planet (turning
RH) = A divided by B = 2.21+ 1 = 3.21
If drive is taken out of the ring gear ( turning
LH) = A divided by B = 3.21
EG the E4D is 78 toothed Ring gear divided by the
42 toothed sun gear =1.85:1+1 = 2.85:1
and the 2.17 is a LH turning planetary
with ring gear held can't remember the tooth count.
It doesn't matter 'what drives what' in the Truck -
just count the teeth.
George ( down under)
Ok I was wrong on that one, on the trucks the sun gear
is held solid to the case, the power is put into the planet and the power is
taken off the ring gear, now what the hell ratio that works out to be I don't
know as I am confused.
I would
like to add that in the truck the planet is held solid to the case, the
power in is put into the sun gear and the power out is taken from the ring
gear so the ratio comes out to 2.21 rather than 3.21 as I am using
it.
The Dodge
overdrive is is a 3.21 and it comes from a 518 and 618 transmission, is that
the gear use you were asking about ??
Ken
I am not familiar with the Dodge
transmission but an overdrive gear with a ratio of 3.17 : 1 is
astounding! Every other OD gear I've come across has a ratio
something like .707 to 1. Are you sure about that gear's
use? I'm always up for learning a new wrinkle.
Tracy
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