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Home > Help Needed / General Tech Chat > Diff pinion teeth | |||||||
133 Posts Member #: 476 Advanced Member The Black Countraaaaay |
22nd Nov, 2014 at 11:16:16pm
Ok I've been a retard and mixed up some 3.2 and 3.1 diff parts. Anyone know how many teeth on the pinion wheels and diff wheel so I can work out which 1 is which? Masturbation is not a crime its a hobby |
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324 Posts Member #: 9441 Senior Member South Devon |
22nd Nov, 2014 at 11:53:17pm
Both use a 19 tooth pinion but the 3.1 uses a 59 tooth crown gear and a 3.2 uses a 61. |
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Forum Mod 10979 Posts Member #: 17 ***16*** SouthPark, Colorado |
23rd Nov, 2014 at 12:08:57am
Both pinions are DAM2808 per calvers very useful links:
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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133 Posts Member #: 476 Advanced Member The Black Countraaaaay |
23rd Nov, 2014 at 03:38:48am
Thanks lads Masturbation is not a crime its a hobby |
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1767 Posts Member #: 9165 Previously josh4444 Australia, brisbane |
23rd Nov, 2014 at 09:07:17am
if you didn't already know diff ratios are just dividing the crown wheel and pinion tooth counts
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696 Posts Member #: 10034 Post Whore Birmingham |
25th Nov, 2014 at 10:03:53am
You need to check the part numbers. Luckily, Wolfie's gears are interchangeable but...
On 23rd Nov, 2014 Keith Calver said:
- Although some gears have the same tooth count for different ratios, they are not interchangeable - hence the need for distinguishing part numbers. Therefore use in known pairs only. - A+ gears have a different tooth profile to pre A+, so they are not interchangeable. Edited by PhilR on 25th Nov, 2014. |
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133 Posts Member #: 476 Advanced Member The Black Countraaaaay |
25th Nov, 2014 at 03:31:21pm
they're both from A+ boxes Phil so shouldn't be a problem. Both are in good nick so I can't see an issue but thanks for everyones help Masturbation is not a crime its a hobby |
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65 Posts Member #: 9646 Advanced Member Bristol England |
25th Nov, 2014 at 09:17:58pm
Hay guys I've not worked on the final drive yet, but from what's been said I'm a bit confused. How can two different ratios have the same size pinion gear, surly if the crown wheel has more teeth then it's diameter must be bigger therefore the pinion needs to be smaller, as the shaft centres are fixed. If the pitch/tooth profile is altered to accommodate the fixed centre dimension then the pinions must all be different for all different ratios. Maybe the same amount of teeth but a different shape. Or have I missunderstood. |
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Forum Mod 10979 Posts Member #: 17 ***16*** SouthPark, Colorado |
25th Nov, 2014 at 10:07:57pm
You have mis-understood.
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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108 Posts Member #: 9182 Advanced Member |
27th Nov, 2014 at 10:06:43am
I never understood how they changed the ratio of the drop gears in the HLE. If you change the diameter of the idle gear the primary and 1st motion must change by the same amount as they are a fixed distance apart unless the idle gear center was also moved. Am I missing something? |
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Forum Mod 10979 Posts Member #: 17 ***16*** SouthPark, Colorado |
27th Nov, 2014 at 07:59:23pm
Please read the post above.... You are missing something...
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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65 Posts Member #: 9646 Advanced Member Bristol England |
27th Nov, 2014 at 08:36:02pm
On 27th Nov, 2014 TurboDave16V said:
Please read the post above.... You are missing something... The PCD of the gear is "theoretically" the mid-point of the tooth in laymans terms, and all the PCD's of a gear train are aligned (not overlapped or not contacting). But in reality, the PCD can be outside or inside of this theoretical "mid-point, and the tooth form can be adjusted to allow for a slightly "thinner", "taller", "fatter", "shorter" tooth form to be used, and still function against another (un-changed) gear. Basically, you can squeeze a few more, or a few less teeth (usualy no more than 8-10% however) into a single gear, and still achieve a satisfactory meshing with an unchanged pair. |
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133 Posts Member #: 476 Advanced Member The Black Countraaaaay |
27th Nov, 2014 at 09:51:07pm
This is why formula 1 cars use helical rather than straight cut gears. They say changing ratios over quickly is a lot simpler with helical gears (this nugget of useless info came from a family member who worked for an F1 team) Masturbation is not a crime its a hobby |
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108 Posts Member #: 9182 Advanced Member |
2nd Dec, 2014 at 05:15:05pm
Got it now ,thanks.
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Forum Mod 10979 Posts Member #: 17 ***16*** SouthPark, Colorado |
3rd Dec, 2014 at 03:18:52am
Overdrive drops of a .90 ratio would reduce the input torque by 10%, but the biggest gain is by widening the ratios (making them still a closer-ratio than the A+, but allowing us to make use of the much wider torque-band of our turbo engines). The other benefit is that the taller ratio (numerically lower) of FD that you'd probably then go with, also has lower bearing loads than a shorter (numerically higher) FD ratio...
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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1767 Posts Member #: 9165 Previously josh4444 Australia, brisbane |
3rd Dec, 2014 at 09:41:34am
so over drive drop gears should really do done if you dont want straight gears and want to run decant power |
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