 Ring and Pinion Backlash, What's everyone doing? |
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| Matt Romanowski |
 Apr 15 2013, 07:11 PM
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#1
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Senior Member  Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507  |
For the folks who are rebuilding their own transmissions, what are you using for a backlash measurement? The manual says around .007, but that seems a little tight. We're trying to get some temperature out of the transmission and were thinking about running a little looser. Anyone tried that?
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Replies
| Dr Evil |
Oct 9 2013, 02:19 PM
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#2
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Send me your transmission! Group: Members Posts: 23,041 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region 
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I disagree. When it comes to the 901 pinion, more teeth takes away from the overall girth of the pinion base with smaller/thinner teeth. They would definitely put this in a box that was not intended to handle crazy tq. These weaknesses become evident when high tq is passed through a box not built for it. When keeping in with parameters speced for the boxes, the number of teeth is not an issue.
Your mention of the change made to gain an extra tooth on the 915 supports what I am saying. Increased size was mandatory and that box handles more tq/hp than a 901. All parts are thicker in that one. |
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| Jon B |
Oct 9 2013, 03:01 PM
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#3
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Member Group: Members Posts: 73 Joined: 28-September 13 From: Vista, CA Member No.: 16,448 Region Association: None |
More teeth increase the gear's load bearing surface and help decrease material fatigue. That is a fact. Each tooth surface bears less sustained load per cycle, as time spent in contact is briefer. And having a slightly taller ratio, the 8:35 pinion has fewer cycles per mile as well.
We can disagree. In any case it's really not a viable solution for anyone, as sets are both scarce and expensive. Jon B. |
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| Dr Evil |
Oct 9 2013, 03:08 PM
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#4
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Send me your transmission! Group: Members Posts: 23,041 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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QUOTE(Jon B @ Oct 9 2013, 05:01 PM)  We can disagree. In any case it's really not a viable solution for anyone, as sets are both scarce and expensive. Jon B. True that. |
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Posts in this topic
Matt Romanowski Ring and Pinion Backlash Apr 15 2013, 07:11 PM
Mark Henry I wouldn't try that, maybe it's time for a... Apr 15 2013, 08:34 PM
Matt Romanowski
I wouldn't try that, maybe it's time for ... Apr 16 2013, 05:15 AM Mark Henry I don't race so mine is just stock.
But, I... Apr 16 2013, 08:02 AM pcar916 :agree: The backlash and contact pattern go work... Apr 16 2013, 08:16 AM Matt Romanowski You can have good settings and contact and still b... Apr 16 2013, 08:29 AM Dr Evil I use the factory tool, or at least a clone of it.... Apr 16 2013, 11:58 AM Jon B The factory states that .012-.018 is tolerance... ... Oct 6 2013, 10:32 PM Jon B
I use the factory tool, or at least a clone of it... Oct 7 2013, 10:49 PM Dr Evil
[quote name='Dr Evil' post='1850919' date='Apr 16... Oct 8 2013, 10:34 AM 396
[quote name='Dr Evil' post='1850919' date='Apr 1... Oct 8 2013, 12:31 PM Dr Evil Not using inches, why would you assume so? Decimal... Oct 6 2013, 10:35 PM Jon B
Not using inches, why would you assume so?
I didn... Oct 6 2013, 10:57 PM 396
Not using inches, why would you assume so?
Hi, I... Oct 7 2013, 05:44 PM Dr Evil Sure, whatever Oct 7 2013, 12:26 AM Matt Romanowski Jon - Good call.
As an update, we're going to... Oct 7 2013, 06:19 AM 76-914
Jon - Good call.
As an update, we're going t... Oct 7 2013, 08:19 AM Jon B
As an update, we're going to pull the transmi... Oct 7 2013, 10:00 PM r_towle Matt, what kind of differential do you use?
Rich Oct 7 2013, 07:56 PM Matt Romanowski
Matt, what kind of differential do you use?
Rich... Oct 7 2013, 11:32 PM zambezi
[quote name='Jon B' post='1936884' date='Oct 6 20... Oct 7 2013, 08:18 PM Dr Evil Ya, in my free time ;) Sorry, I am at my 9a-9p job... Oct 8 2013, 12:41 PM Dr Evil Search on Pelican as the guy who made them had a t... Oct 8 2013, 12:41 PM jimkelly see post #43
http://www.914world.com/bbs2/index.p... Oct 8 2013, 12:47 PM Dr Evil Um, no. That is not it. Oct 8 2013, 12:49 PM Matt Romanowski Post 21 shows one though. Oct 8 2013, 01:25 PM sixnotfour http://forums.pelicanparts.com/porsche-911...tml#p... Oct 8 2013, 01:56 PM Dr Evil
http://forums.pelicanparts.com/porsche-911...tml#... Oct 8 2013, 02:42 PM r_towle Matt,
Have you considered replacing the diff hous... Oct 8 2013, 07:44 PM Matt Romanowski
Matt,
Have you considered replacing the diff hou... Oct 8 2013, 08:25 PM Jon B We have a billet intermediate plate and side plate... Oct 8 2013, 09:35 PM Matt Romanowski
We have a billet intermediate plate and side plat... Oct 8 2013, 10:46 PM Jon B Matt,
You realize that's alot of engine and t... Oct 8 2013, 11:32 PM Matt Romanowski
Matt,
You realize that's alot of engine and ... Oct 9 2013, 06:07 AM r_towle
Matt,
You realize that's alot of engine and ... Oct 9 2013, 11:19 AM Jon B Can you replace the ring and pinion with the 8 too... Oct 9 2013, 12:07 PM John I use the VW tools. Got them to do 915's, but... Oct 8 2013, 07:52 PM Jon B John,
Those are excellent tools, and Porsche-reco... Oct 8 2013, 09:18 PM John
John,
Those are excellent tools, and Porsche-rec... Oct 9 2013, 08:18 PM 914forme Okay the magic mystery tool is really not needed. ... Oct 9 2013, 07:17 AM pcar916
Now Pinion Backlash, I hate doing that, shims, pu... Oct 9 2013, 08:24 AM Dr Evil Agreed, I hate setting preload. <_< Oct 9 2013, 08:23 AM Dr Evil Going to more teeth on the pinion of a 901 will ac... Oct 9 2013, 12:10 PM Jon B Going to more teeth on the pinion of a 901 will ac... Oct 9 2013, 02:08 PM Dr Evil Late, but none the less relevant. Oct 9 2013, 04:30 PM Jon B It only began in April, so not quite a resurrectio... Oct 9 2013, 05:13 PM Dr Evil Yup, relevant, addressed two misplaced decimals, I... Oct 9 2013, 05:31 PM Jon B John,
I have more than one bar, but keep the smal... Oct 9 2013, 10:00 PM Jon B 914 Transmission
Measuring differential bearing pr... Oct 11 2013, 03:46 PM 396 Thanks for the indepth education. Now we know who ... Oct 11 2013, 03:54 PM Jon B 914 Transmission
Setting Ring & Pinion
Factor... Oct 11 2013, 04:03 PM |
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