12 bolt issue with Autocross use. - LS1TECH

Go Back   LS1TECH > RACING DEPARTMENT > Road Racing
Log In 
Search


Road Racing
Road Course | Autocross


12 bolt issue with Autocross use.

Reply
 
Thread Tools Search this Thread
Old 07-26-2005, 07:30 AM   #1
10 Second Club
 
RAMPANT's Avatar
 
Trader Rating: 17
Join Date: Mar 2004
Location: Ontario, Canada
Posts: 1,551
Default 12 bolt issue with Autocross use.

I have a Moser 12 bolt with a Eaton 33 splice HD posi. with 3:73's. It has a breather tube on the drivers side of the cars axle tube. We looped the tube up as high as we could and tied it off to a brake line. I run on Kuhmo V710's, lots of grip.

At a recent autocross that was run clockwise (mostly right turns) the tube spilled out some axle lube. I assume some of the prolonged sweepers push the oil up the tube. What can be done to prevent this, possibly an pcv valve or some sort of a catch can. I was thinking the valve would close when oil hit it but would allow expanding gases to escape..

Thank you for your input in advance.

Rampant
__________________
-1999 Formula WS6 -


http://tfbm.org
Old -412ci LS2! 511rwhp thru cats
New-455ci RED's MID LS7! c/w 55mm Harrop, 705hp 663ft.lbs @ fw NA
http://www.streetfire.net/video/ls7-...-2_2290861.htm
RAMPANT is offline   Reply With Quote
Old 09-29-2005, 08:29 AM   #2
12 Second Club
 
Viper's Avatar
 
Trader Rating: 6
Join Date: Dec 2001
Location: Cleveland, OH
Posts: 4,676
Default

Check out www.frrax.com; I've read of guys using a catch can for the 12 bolts.
__________________
99' Pewter T/A M6
http://www.youtube.com/watch?v=QL42Ya59vgQ
Viper is offline   Reply With Quote
Old 09-29-2005, 09:21 AM   #3
10 Second Club
 
RAMPANT's Avatar
 
Trader Rating: 17
Join Date: Mar 2004
Location: Ontario, Canada
Posts: 1,551
Default

Quote:
Originally Posted by Viper
Check out www.frrax.com; I've read of guys using a catch can for the 12 bolts.
Thanks, I ened up looping it towards the center of the diff, instead of towards the out side. The problem seemed to go away. since the G forces start to push the oil back down the tube. I just had to think it out.

thanks again.

Rampant
__________________
-1999 Formula WS6 -


http://tfbm.org
Old -412ci LS2! 511rwhp thru cats
New-455ci RED's MID LS7! c/w 55mm Harrop, 705hp 663ft.lbs @ fw NA
http://www.streetfire.net/video/ls7-...-2_2290861.htm
RAMPANT is offline   Reply With Quote
Old 10-29-2005, 09:31 PM   #5
11 Second Club
 
Trader Rating: 4
Join Date: Nov 2002
Location: 913/949
Posts: 896
Default

How do you like that HD posi? I have the regular limited slip in my strange and think it slips a little too much.
KCFormula is offline   Reply With Quote
Old 10-31-2005, 12:46 AM   #6
Staging Lane
 
01firechicken's Avatar
 
Trader Rating: 0
Join Date: Jun 2002
Location: US Army germany
Posts: 84
Default

Same problem here with my 9in. Ended up being over filled......hasn't happened again in 9 months.
__________________
73 & 01 Trans Am WS6. 01. Mods; Not a Single thing.....HONEST
2004 F-Body Europe King of the Hill
2005 F-Body Europe King of the Hill
01firechicken is offline   Reply With Quote
Old 11-01-2005, 06:53 AM   #7
Launching!
 
steve-d's Avatar
 
Trader Rating: 7
Join Date: Apr 2003
Posts: 277
Default Possibly overfilled rear!!

I use a Moser 12 bolt w/33 splines. Never had an issue re excess oil out the breather tube. Nice and long and straight up from the axel. Make sure you fill correctly and don't add anthing over the fill hole.

BTW, these clutch diffs suck for the AX or road race use. I'm eventually going to get the Detroit Tru Track now available thru Moser. A true torsen diff. Unfortunately, it requires new axels and gears for my use (4.11). Over a grand.

Steve
__________________
'02 F'hawk, #642, TCS, M6, Hurst, SLP Spoiler
Suspension: Ground Control coil overs w/Koni DAs; SLP SFC, STB, DSSL; LG TA, AL PHB, Upper & Lower "A" Arms, 35mm ASB; CCW 18 x 11 w/Goodyear Eagles.
Engine: SLP Heads, Stroker Cam, 85mm MAF, Bellows, CAI, 160* stat, Fidanza Al FW, Spec STG 2+ clutch, 4:11 Moser Rear, Headers, 2OTL, Dyno Tuning, race pipes; FAST 90mm Intake and TB!
Porsche 996TT Prospeed front brakes, Baer rear rotors
421 SAE RWHP;
Bring on the Z06s and 911s!
steve-d is offline   Reply With Quote
Old 11-06-2005, 10:42 PM   #8
12 Second Club
 
01SLPSS's Avatar
 
Trader Rating: 46
Join Date: Aug 2003
Location: Timberlake,Ohio
Posts: 421
Default

Had this same problem at Nelsons Ledges Road Course in NE Ohio this past Friday with My 01' SS with the 12-Bolt in it, damn diff fluid wouldn't stop comin out!!!! How do I solve the problem????
__________________
2002 Corvette ZO6
Cammed-Headers-Stage IV T56 6Speed-RPM 4.11 Diff

2001 Camaro SLP SS CME
LSX-Moser 9" 3.90's-Stage V T-56-Twin Disc-6PT Cage

1971 Nova SS-Whipple Blown Dart 540BBC- Turbo 400 W/Gear Vendors -12PtCage-4Link-9" 3.73's- QA1's
01SLPSS is offline   Reply With Quote
Old 11-07-2005, 06:39 AM   #9
Launching!
 
steve-d's Avatar
 
Trader Rating: 7
Join Date: Apr 2003
Posts: 277
Default

Which hole are you using to determine when the rear is full? That could be the issue.

Steve
__________________
'02 F'hawk, #642, TCS, M6, Hurst, SLP Spoiler
Suspension: Ground Control coil overs w/Koni DAs; SLP SFC, STB, DSSL; LG TA, AL PHB, Upper & Lower "A" Arms, 35mm ASB; CCW 18 x 11 w/Goodyear Eagles.
Engine: SLP Heads, Stroker Cam, 85mm MAF, Bellows, CAI, 160* stat, Fidanza Al FW, Spec STG 2+ clutch, 4:11 Moser Rear, Headers, 2OTL, Dyno Tuning, race pipes; FAST 90mm Intake and TB!
Porsche 996TT Prospeed front brakes, Baer rear rotors
421 SAE RWHP;
Bring on the Z06s and 911s!
steve-d is offline   Reply With Quote
Old 11-07-2005, 04:52 PM   #10
Cal
TECH Veteran
 
Cal's Avatar
 
Trader Rating: 1
Join Date: Feb 2003
Location: Northern Utah
Posts: 4,692
Default

You can put a little mini-K&N filter on it like NASCAR and Stock Car racers do. Like this one:

http://www.speedwaymotors.com/xq/asp...qx/Product.htm
__________________
2001 SS M6 Arctic White
431 rwhp @ 6400 rpm, 398 rwtq
3083 lb. race weight, TSP 235/240
Rolling on 13" Goodyear slicks all 4 corners
150 mph Club Member Bonneville Salt Flats LSR
2002 Duramax Tow Vehicle
2001 Corvette M6 White
Cal is offline   Reply With Quote
Old 11-07-2005, 09:03 PM   #11
Launching!
 
steve-d's Avatar
 
Trader Rating: 7
Join Date: Apr 2003
Posts: 277
Default

Quote:
Originally Posted by Cal
You can put a little mini-K&N filter on it like NASCAR and Stock Car racers do. Like this one:

http://www.speedwaymotors.com/xq/asp...qx/Product.htm
Failing to have a long enough breather hose could, under certain circumstances, lead to a fluid problem. If one runs the rear w/too short a breather hose it could over spill onto the rear. My breather hose is about two feet long and goes straight up. I don't run a small K&N filter, but one could to avoid ingress of debris.

When filling, the overflow hole is on the passenger side of the diff. Fill from the top with Organic fluid until it runs out the side hole. Guesses will only lead to messes.

Steve
__________________
'02 F'hawk, #642, TCS, M6, Hurst, SLP Spoiler
Suspension: Ground Control coil overs w/Koni DAs; SLP SFC, STB, DSSL; LG TA, AL PHB, Upper & Lower "A" Arms, 35mm ASB; CCW 18 x 11 w/Goodyear Eagles.
Engine: SLP Heads, Stroker Cam, 85mm MAF, Bellows, CAI, 160* stat, Fidanza Al FW, Spec STG 2+ clutch, 4:11 Moser Rear, Headers, 2OTL, Dyno Tuning, race pipes; FAST 90mm Intake and TB!
Porsche 996TT Prospeed front brakes, Baer rear rotors
421 SAE RWHP;
Bring on the Z06s and 911s!
steve-d is offline   Reply With Quote
Old 11-07-2005, 11:16 PM   #12
12 Second Club
 
01SLPSS's Avatar
 
Trader Rating: 46
Join Date: Aug 2003
Location: Timberlake,Ohio
Posts: 421
Default

I have been using a vent that I bought from Summit when I put the 12-Bolt in Last year, and it has always leaked alittle, but when road racing it poured out of the diff!!!!! Click on link!!!!!
http://store.summitracing.com/defaul...h.asp&x=26&y=9

How can I fix the problem, get rid of the vent and put a fitting with how much rubber hose sticking up??? What works for you guys!!!
__________________
2002 Corvette ZO6
Cammed-Headers-Stage IV T56 6Speed-RPM 4.11 Diff

2001 Camaro SLP SS CME
LSX-Moser 9" 3.90's-Stage V T-56-Twin Disc-6PT Cage

1971 Nova SS-Whipple Blown Dart 540BBC- Turbo 400 W/Gear Vendors -12PtCage-4Link-9" 3.73's- QA1's
01SLPSS is offline   Reply With Quote
Old 11-08-2005, 06:33 AM   #13
Launching!
 
steve-d's Avatar
 
Trader Rating: 7
Join Date: Apr 2003
Posts: 277
Default

Are you running a hose attached to the vent? It appears to have a nipple designed to accept a hose and clamp.

There doesn't appear to be anything wrong w/the vent. Any vent is going to be designed to allow for the change in internal pressure based on generation of heat and then cooling. You may want to run a hose straight up from the tube where the vent is attached and just secure it with wire ties onto something up there.

Steve
steve-d is offline   Reply With Quote
Old 11-08-2005, 06:43 AM   #14
Launching!
 
steve-d's Avatar
 
Trader Rating: 7
Join Date: Apr 2003
Posts: 277
Default

Ah, I took a look at the enlarged picture. The nipple portion I referred to was actually the threaded portion going into the axel tube. This type vent doesn't allow for the use of a hose and when pulling high G's in a turn will allow for fluid to be pushed out. Your problem was exacerbated by the fact that Moser placed the vent on the driver side tube--exactly where the fluid is being pushed when turning mostly right on a road course.

Don't dispair. Go to an auto parts store, Lowes or a hardware store. Get a barbed hose adapter also having a threaded portion on the other end. Run two feet of hose straight up and you could even use your vent at the end of the hose if you want to keep it in operation.

The OE Moser part has an NPT thread to secure it to the tube w/o leaks. Or you could just call Moser to see if they'll just ship one to you for a couple of bucks.

Steve
steve-d is offline   Reply With Quote
Old 11-08-2005, 06:33 PM   #15
TECH Addict
 
Trader Rating: 5
Join Date: Jun 2005
Posts: 2,405
Default

I also have a Moser 12-bolt, and I tried a bunch of stuff to vent it:

1. Originally tried the hose fitting that came with the rear; the one already mentioned on the driver's side tube. My 3" dual exhaust goes in that space, and a large bump made the fitting hit the exhaust. Fitting broke. Plugged hole with NPT plug.

2. Tried a -6 hose fitting off the filler hole, with a big loop in the hose to trap fluid, and a Earl's -6 filter on the end to prvent dirt from going in. Sprayed fluid any time I went fast. Correct fluid level in rear.

3. Put the same setup way up near my trunk floor, in front of the fuel cell. Still sprayed fluid.

4. The rearend is currently not vented. No problems, no leaks.

If I ever go back to a vent I'll probably put a catch canister in there with a little drain, and run the hose up higher into the trunk.

Jim
__________________
Don't bring a knife to a gunfight.
http://home.mindspring.com/~jim_fisk/sitebuildercontent/sitebuilderpictures/4dr_test_sig1.jpg
Half-Assed = Half Fast.
DeltaT is offline   Reply With Quote
Reply


Tags
12, 6m, auto, autocross, axles, bolt, cross, moser, oil, racing, road, running, seal, stock, strange, wheel


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 01:01 AM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details