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How a manual transmission works... a question



 
 
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  #1  
Old May 24th 05, 07:36 PM
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Default How a manual transmission works... a question

Trying to understand more about manual's, and came across this
excellent article:

http://auto.howstuffworks.com/transmission5.htm

However, here's the part I don't get: What is preventing the driver
from shifting into reverse while going 60 miles an hour?

>From the colored diagram.... Please correct me if I have this wrong:

The purple collars are always spinning when the car is moving. The
blue, red, and green STOP spinning when the clutch is in neutral and
the clutch is pushed in, or at least, spinning slowly from the friction
of the output shaft (yellow) rubbing on the bearings that the blue
gears ride on.

TIA!

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  #2  
Old May 24th 05, 08:11 PM
Don Bruder
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In article . com>,
wrote:

> Trying to understand more about manual's, and came across this
> excellent article:
>
>
http://auto.howstuffworks.com/transmission5.htm
>
> However, here's the part I don't get: What is preventing the driver
> from shifting into reverse while going 60 miles an hour?


Nothing whatsoever, beyond the difficulty likely to be encountred in
trying to get the involved gears to mesh at those speeds. (never mind
the fact that the tranny is likely to actively fight you due to the fact
that the reverse gear is being driven "the wrong way" by the
forward-turning wheels/driveline)

Muscle it hard enough, and/or play with the throttle right, and you
could indeed do it - Although you'll almost certainly wish you'd failed
within a second or so of your "achievement". A grenaded clutch disk
(spun apart by way too many RPMs) would be the most likely outcome, I
would think, with other parts possibly "going south" on you as well -
Perhaps with great noise and violence...

--
Don Bruder - - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
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  #3  
Old May 24th 05, 08:29 PM
Mike Romain
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wrote:
>
> Trying to understand more about manual's, and came across this
> excellent article:
>
>
http://auto.howstuffworks.com/transmission5.htm
>
> However, here's the part I don't get: What is preventing the driver
> from shifting into reverse while going 60 miles an hour?
>


Absolutely nothing, I have done it. I hit reverse in a car once and
only locked the rear wheels into a chirp when I realized it. Nothing
blew up.... I was lucky....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
  #4  
Old May 24th 05, 09:19 PM
Don Bruder
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In article >,
Mike Romain > wrote:

> wrote:
> >
> > Trying to understand more about manual's, and came across this
> > excellent article:
> >
> >
http://auto.howstuffworks.com/transmission5.htm
> >
> > However, here's the part I don't get: What is preventing the driver
> > from shifting into reverse while going 60 miles an hour?
> >

>
> Absolutely nothing, I have done it. I hit reverse in a car once and
> only locked the rear wheels into a chirp when I realized it. Nothing
> blew up.... I was lucky....


Yep, that would make two of us - Although I accomplished mine in a car
with an automatic. Had this "hit the lights all green" strategy that
seemed to do *WAY* better than 75% - Come off the the north/south
freeway onto the east/west freeway leading into town, and mash the
throttle for all it could give me/all traffic allowed in the space
between the end of the off-ramp and the "Freeway ends 1 mile" sign.
Usually that meant I'd be hitting somewhere between 70 and 80 as I blew
past the sign. Bump the shifter into neutral, and coast in to the first
light, which would (more often than not) change green just as I rolled
up at about 40-ish. If I caught the first one, bumping it back into gear
and holding at 40 would put me through the entire ten light sequence
with every one of them green my way.

One day I did this for probably the 100th time, if not more, only my
"bump" was a bit too energetic, and I went through neutral and into
reverse... <SHREEEEEIIIIIIIIK!> Smoking rubber, ass-end juddering around
like it was about to go into bucking bronco mode, and me grabbing wildly
at the gearshift with one hand while trying to keep the car pointed
straight with the other, and the engine stalling out. It was a rather
"interesting" ride that I don't have any wish to go on again!

Didn't do any damage (that was evident right then, anyway... Strongly
suspect that it WAS the death-stroke for the tranny, though, since it
was only a couple months later that the thing went completely
tango-uniform) but by all rights, that transmission should have gone off
like a bomb... Manual or automatic, they just aren't made for being
punched into reverse at 70+!

--
Don Bruder - - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
  #5  
Old May 24th 05, 09:28 PM
Steve W.
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Default


> wrote in message
ups.com...
> Trying to understand more about manual's, and came across this
> excellent article:
>
> http://auto.howstuffworks.com/transmission5.htm
>
> However, here's the part I don't get: What is preventing the driver
> from shifting into reverse while going 60 miles an hour?
>
> >From the colored diagram.... Please correct me if I have this

wrong:
> The purple collars are always spinning when the car is moving. The
> blue, red, and green STOP spinning when the clutch is in neutral and
> the clutch is pushed in, or at least, spinning slowly from the

friction
> of the output shaft (yellow) rubbing on the bearings that the blue
> gears ride on.
>
> TIA!
>


Nothing. Just like most transmissions you can shift into reverse from a
forward gear. If your REALLY lucky the only thing that happens is that
the rear tires lock up and the engine quits and you slide to a stop. If
your unlucky, the trans will go into gear and then grenade the weakest
part in the driveline. What that part is depends on the vehicle.
Anything from U-Joints to the clutch disc or even the crankshaft in the
engine. Something will give.



--
Steve Williams



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  #6  
Old May 24th 05, 09:35 PM
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Default

Some cars used to have a reverse lockout which helped to prevent disaster
when overvigorously
shifting.

It isnt likely you would get it completely into reverse while moving
forward, but even to snag a little
bit of the gear could, would, cause splinters to fly.



  #8  
Old May 24th 05, 10:31 PM
Steve
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Default


>
> However, here's the part I don't get: What is preventing the driver
> from shifting into reverse while going 60 miles an hour?


A greyish organ with lots of lumps and folds, located between the
driver's ears.

  #9  
Old May 24th 05, 10:47 PM
Thomas Tornblom
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Default

Steve > writes:

> > However, here's the part I don't get: What is preventing the driver

>
> > from shifting into reverse while going 60 miles an hour?

>
> A greyish organ with lots of lumps and folds, located between the
> driver's ears.
>
>


Plus a *very* pronounced grinding noise when he attempts to do it.
  #10  
Old May 25th 05, 02:51 AM
John S.
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"What is preventing the driver from shifting into reverse while going
60 miles an hour?"

JS> Aside from the fact that it would take a real effort to grind
those gears together I suspect the overriding reason would be cost. A
boneyard gearbox on most cars will set you back $2k. If you can't find
one a new one may exceed the value of a used car.

 




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