overdrive slip ?? - Page 2 - GL1800Riders
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post #11 of 36 (permalink) Old 04-12-2017, 11:23 AM
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Originally Posted by cycledude View Post
The heaviest load on the driveshaft is mostly when it's in 5th gear , he could be having an entirely different issue but from the way I read in the first post the rubber cushion inside the driveshaft failing would be my first guess and it's only a guess, I sure ain't no expert.

cycledude could you explain your reasoning here? I would think the opposite here: that the most torque and sheer twisting force on the driveshaft would be seen when making a hot take off in first gear and second gear....not the most driveshaft RPM's, but the torque applied to the driveshaft.


Not to confuse or put down the OP, although it is technically an overdrive gear due to the gearing ratio, almost all here probably just call it 5th gear and you'd probably find more in searches using that term instead of "overdrive".
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post #12 of 36 (permalink) Old 04-12-2017, 11:36 AM
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Agree...... heaviest loads or maximum torque on a driveline component downstream of a transmission occurrs in 1st gear not the high gear.
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post #13 of 36 (permalink) Old 04-12-2017, 11:46 AM
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Disagree.....starting off in high gear is near impossible, Why? because it required a great amount of torque to rotate the wheel. It is easier to rotate in low gear therefor less torque.
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post #14 of 36 (permalink) Old 04-12-2017, 11:52 AM
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post #15 of 36 (permalink) Old 04-12-2017, 12:25 PM
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Disagree.....starting off in high gear is near impossible, Why? because it required a great amount of torque to rotate the wheel. It is easier to rotate in low gear therefor less torque.
My best and final effort to convince you to change your mind is to offer you a freshly made chocolate chip cookie my granddaughter just made. ........ these are truly priceless.
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post #16 of 36 (permalink) Old 04-12-2017, 12:38 PM
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I truly appreciate the offer of the cookie, and I do like chocolate chips but that will not change physics!

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post #17 of 36 (permalink) Old 04-12-2017, 01:53 PM
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cycledude could you explain your reasoning here? I would think the opposite here: that the most torque and sheer twisting force on the driveshaft would be seen when making a hot take off in first gear and second gear....not the most driveshaft RPM's, but the torque applied to the driveshaft.


Not to confuse or put down the OP, although it is technically an overdrive gear due to the gearing ratio, almost all here probably just call it 5th gear and you'd probably find more in searches using that term instead of "overdrive".
@cycledude
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Yes it probably would be possible to put a heavier load on the driveshaft by starting out really fast in first gear, but to maintain high speed in 5th gear requires a lot more continuos horse power than rolling along at 20 mph in first gear would. Wish I had a better explanation but that's about the best I can do.
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post #18 of 36 (permalink) Old 04-12-2017, 02:00 PM
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Disagree.....starting off in high gear is near impossible, Why? because it required a great amount of torque to rotate the wheel. It is easier to rotate in low gear therefor less torque.
I totally agree with what u said but just for fun try starting out in 5th gear sometime, on a level road the 1800 wing is very capable of starting out in any gear without ever touching the throttle ! It's pretty amazing !

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post #19 of 36 (permalink) Old 04-12-2017, 02:08 PM
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Having replaced a few clutches in pickups I know that I first noticed them slipping in high gear. I would guess it is the same for the drive shaft. Along with checking the oil used and the drive shaft Waldo had a post here about slipping clutches due to the master cylinder needing cleaned out.
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post #20 of 36 (permalink) Old 04-12-2017, 05:04 PM
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Torque vs HP

Quote:
Originally Posted by cycledude View Post
Yes it probably would be possible to put a heavier load on the driveshaft by starting out really fast in first gear, but to maintain high speed in 5th gear requires a lot more continuos horse power than rolling along at 20 mph in first gear would. Wish I had a better explanation but that's about the best I can do.
Yes, you use more HP in higher gears, but not more torque (in general anyway). The drive shaft could not care less about the HP, it only cares about the torque it has to deliver to the rear wheel. Think about it. The a rapidly spinning drive shaft with very low torque applied is not under much stress, but that same drive shaft spinning very slowly under lots of torque is under lots of stress even though it may be delivering little power. In fact the drive shaft may twist off delivering no power at all if the RPM is zero!

Power = Torque * RPM / Constant

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