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Posted by: ClayPerrine Dec 17 2004, 08:00 AM

There seems to be some confusion on how the differential works in a 914, and how flipping the differential affects the function of the transmission.

In Figure 1. We see the full differental of a 914.


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Posted by: ClayPerrine Dec 17 2004, 08:01 AM

You see that the rotation of the pinion shaft clockwise results in the output flanges rotating in a forward direction.

Here is a simplified drawing. This represents the ring and pinion gears without a differental, as if there was a spool installed.


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Posted by: ClayPerrine Dec 17 2004, 08:04 AM

Now we show a picture of the differental with the ring gear flipped to the other side. Note that we have not changed the rotation direction of the pinion shaft. It now shows the cv joints rotating in the other direction.


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Posted by: ClayPerrine Dec 17 2004, 08:05 AM

To further clairfy the difference the location of the ring gear makes, this diagram illustrates a differental with 2 ring gears to drive the cv joints. Note that the cv joints will rotate in opposite directions.


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Posted by: ClayPerrine Dec 17 2004, 08:08 AM

In all the drawings, we never changed the rotation direction of the pinion gear, but the output shafts changed rotation direction based on the position of the ring gear. This is how we can "flip" the ring gear in a 915 our of a 911, and get it to work behind a 914 /6 engine. Moving the ring gear to the other side of the pinion makes the output flanges run in the opposite direction without changing the rotation of the engine.

Hope this helps clear up the differental mystery about flipping the ring gear.

Posted by: slivel Dec 17 2004, 10:14 AM

Posted by: crash914 Dec 17 2004, 12:45 PM

and I thought Yoder was here.......

Posted by: ClayPerrine Dec 17 2004, 01:10 PM

Nope. He's not back from Florida yet. But I will let him know you are thinking of him.....