 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
| r_towle |
Oct 8 2013, 07:44 PM
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#2
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Matt,
Have you considered replacing the diff housing plates on the outside with thicker ones? I wonder if you may have experienced flexing, thus heat....dunno |
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| Matt Romanowski |
Oct 8 2013, 08:25 PM
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#3
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
QUOTE(r_towle @ Oct 8 2013, 05:44 PM)  Matt, Have you considered replacing the diff housing plates on the outside with thicker ones? I wonder if you may have experienced flexing, thus heat....dunno We have a billet intermediate plate and side plate. |
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| Jon B |
Oct 8 2013, 09:35 PM
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#4
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Member Group: Members Posts: 73 Joined: 28-September 13 From: Vista, CA Member No.: 16,448 Region Association: None |
QUOTE(Matt Romanowski @ Oct 8 2013, 07:25 PM) We have a billet intermediate plate and side plate. Matt, Were billet IP and diff cover already installed, or new for transmission? Do you race this car? What type of engine are you running? Jon B. |
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| Matt Romanowski |
Oct 8 2013, 10:46 PM
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#5
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
QUOTE(Jon B @ Oct 8 2013, 07:35 PM) QUOTE(Matt Romanowski @ Oct 8 2013, 07:25 PM) We have a billet intermediate plate and side plate. Matt, Were billet IP and diff cover already installed, or new for transmission? Do you race this car? What type of engine are you running? Jon B. The billet IP and diff cover were from a previous transmission that killed itself. It is a race car with a stock 3 liter six in it. 2050 pounds. It gets a lot of time - we'll do almost 3,000 track miles and around 60 hours this year. |
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| Jon B |
Oct 8 2013, 11:32 PM
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#6
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Member Group: Members Posts: 73 Joined: 28-September 13 From: Vista, CA Member No.: 16,448 Region Association: None |
Matt,
You realize that's alot of engine and torque for a 901/914 transmission. I'm not surprised it's running hot. It will be worse with a TBD or LSD installed. I'm curious to see your cooling system. Compare 901 to early 915 pinion below. The 7-tooth 915 pinion is from a 2.4 liter road car; Porsche went to an 8-tooth pinion in 2.7 liter series. And you're racing with a 3.0 liter engine...  Jon B. Vista, CA |
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| Matt Romanowski |
Oct 9 2013, 06:07 AM
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#7
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
QUOTE(Jon B @ Oct 8 2013, 09:32 PM) Matt, You realize that's alot of engine and torque for a 901/914 transmission. I'm not surprised it's running hot. It will be worse with a TBD or LSD installed. I'm curious to see your cooling system. Compare 901 to early 915 pinion below. The 7-tooth 915 pinion is from a 2.4 liter road car; Porsche went to an 8-tooth pinion in 2.7 liter series. And you're racing with a 3.0 liter engine... Jon B. Vista, CA It is a lot and around the limit of what you can put through a 901. We pull oil from the drain and put it back on the gears and R+P. The cooler is about 11x8 and has a blower forcing air through it. |
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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,
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 I disagree. When it comes to the 901 pinion, more ... Oct 9 2013, 02:19 PM Jon B More teeth increase the gear's load bearing su... Oct 9 2013, 03:01 PM Dr Evil
We can disagree.
In any case it's really no... Oct 9 2013, 03:08 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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