 How Differentals work |
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| ClayPerrine |
 Dec 17 2004, 08:00 AM
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#1
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Life's been good to me so far.....  Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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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. Attached image(s) 
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| ClayPerrine |
Dec 17 2004, 08:01 AM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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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. Attached image(s) 
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| ClayPerrine |
Dec 17 2004, 08:04 AM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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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.
Attached image(s) 
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| ClayPerrine |
Dec 17 2004, 08:05 AM
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#4
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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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.
Attached image(s) 
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| ClayPerrine |
Dec 17 2004, 08:08 AM
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#5
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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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. |
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| slivel |
Dec 17 2004, 10:14 AM
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#6
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Old car....... older driver Group: Members Posts: 508 Joined: 10-July 04 From: San Diego Member No.: 2,332 Region Association: Southern California |
QUOTE(ClayPerrine @ Dec 17 2004, 06:08 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. Yeah, imagine my displeasure when I reinstalled the box in my racecar that the local shop had freshened and found that I had 1 forward gear and 5 reverse gears. Of course the shop re-freshened the box on their dime - this time for a 914 configuration instead of 911. Steve. |
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| crash914 |
Dec 17 2004, 12:45 PM
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#7
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
and I thought Yoder was here....... (IMG:style_emoticons/default/laugh.gif)
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| ClayPerrine |
Dec 17 2004, 01:10 PM
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#8
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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Nope. He's not back from Florida yet. But I will let him know you are thinking of him.....
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