12-bolt Strong Enough For 1,000 Hp
03-01-2004, 08:05 AM
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12-bolt Strong Enough For 1,000 Hp I'm putting together a stout combo and was wondering if my Moser 12-bolt 33-spline with Eaton posi will hold up.I should trap in the 150 mph range and want to stay safe.If the 12-bolt were to fail in a run would there be any danger of crashing.I love racing but don't want to do something stupid to jeopardize my safety.Suggestions would be appreciated.Derty,Y2KHAWK,Tom Kemf what are you guys using?
03-01-2004, 09:18 AM
#2
Dave....any 12-bolt is going to have c-clip eliminators. There are 4 bolt that hold the axles in on the ends. These prevent the axles from coming out the end of the shafts if one should break. Personally at that HP level, a POSI is a poor choice. The only real choice for you is a SPOOL in my opinion. Mike Brown's posi was toast after last season and had to be rebuilt. He was only pushing maybe 750rwhp, but gobs of torque.
03-01-2004, 09:27 AM
#3
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also, fortently almost all axle shaft failers are in the first 60ft, before you get speed in it. i also agree on not useing a posi. a spool will be the only way you will be able to plant that kind of power. but remeber, when you do break an axle with a spool, you are going to make a hard turn, eather into the wall or the other lane. at that kind of HP level, nothing is garrented to prevent an accident. its just the nature of dragracing. enjoy.
steve.
steve.
03-01-2004, 12:22 PM
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Originally Posted by Reckless
Dave....any 12-bolt is going to have c-clip eliminators. There are 4 bolt that hold the axles in on the ends. These prevent the axles from coming out the end of the shafts if one should break. Personally at that HP level, a POSI is a poor choice. The only real choice for you is a SPOOL in my opinion. Mike Brown's posi was toast after last season and had to be rebuilt. He was only pushing maybe 750rwhp, but gobs of torque.
03-01-2004, 01:11 PM
#6
the clutches in ANY posi will fry in a matter of a few launches with anything close to that kind of power. i would go for a spool and if you are serious about running 1000 hp, i would run a 9" design. at that power level, a few extra hp it costs to turn that assembly is not a concern.
check out that Billingsley 9" assembly. it looks TOP NOTCH.
check out that Billingsley 9" assembly. it looks TOP NOTCH.
03-01-2004, 07:05 PM
#7
Honestly have to agree with Gator on this. That is the route Mike also took. He ordered a new 9-inch with a spool, then put the spool in his old housing, and put a new posi unit in the new housing and sold the rear to Ray.
I would also opt for a 9-inch with 35 splines and a spool. Also get 1/2" studs if they can do them. It's time to get serious Dave. When you get to a certain level, you have to run the most heavy duty stuff you can.
I would also opt for a 9-inch with 35 splines and a spool. Also get 1/2" studs if they can do them. It's time to get serious Dave. When you get to a certain level, you have to run the most heavy duty stuff you can.
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03-02-2004, 06:58 AM
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Originally Posted by Reckless
Honestly have to agree with Gator on this. That is the route Mike also took. He ordered a new 9-inch with a spool, then put the spool in his old housing, and put a new posi unit in the new housing and sold the rear to Ray.
I would also opt for a 9-inch with 35 splines and a spool. Also get 1/2" studs if they can do them. It's time to get serious Dave. When you get to a certain level, you have to run the most heavy duty stuff you can.
I would also opt for a 9-inch with 35 splines and a spool. Also get 1/2" studs if they can do them. It's time to get serious Dave. When you get to a certain level, you have to run the most heavy duty stuff you can.
03-03-2004, 01:56 PM
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The posi will not last with that kinda power. I speak from experience: http://community.webshots.com/album/106115672Cfxmsw
You can just add a spool & sell the Eaton, before you destroy it. I chose to shorten the housing 3" & sent the axles to Moser to be gun drilled, shortened, and star flanged (actually the just drilled more lightening holes on the ends.
Now looks like: http://community.webshots.com/photo/...22799632AgyeXP
You can just add a spool & sell the Eaton, before you destroy it. I chose to shorten the housing 3" & sent the axles to Moser to be gun drilled, shortened, and star flanged (actually the just drilled more lightening holes on the ends.
Now looks like: http://community.webshots.com/photo/...22799632AgyeXP
03-09-2004, 06:23 AM
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I ordered a 9 inch from Moser yesterday.The 12-bolt was sold while it was still intact.I got 40 spline gun-drilled axles,lightweight centersection with aluminum spool and a 3.89 Pro gear.I had them install a axle brace,shorten the housing 2 inches and 3 inch 5/8 studs.This baby should hold up real well to the power I plan on running through it.
03-10-2004, 07:59 AM
#14
Originally Posted by 422 SS
I ordered a 9 inch from Moser yesterday.The 12-bolt was sold while it was still intact.I got 40 spline gun-drilled axles,lightweight centersection with aluminum spool and a 3.89 Pro gear.I had them install a axle brace,shorten the housing 2 inches and 3 inch 5/8 studs.This baby should hold up real well to the power I plan on running through it.
03-10-2004, 07:20 PM
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Originally Posted by Reckless
Hope you didn't get too much gear Dave! What size tires you running? That thing is gonna trap like 160+ right?
03-11-2004, 07:37 AM
#17
Originally Posted by 422 SS
I asked Wade the same question and he said 3.89 is perfect with a 28 inch W tire.Remember this engine will be capable of spinning some serious rpm.It will see high rpm's going through the lights but it won't be there for long.
03-11-2004, 11:21 AM
#18
The Bull
You made the right choice. I had a 12 bolt with 30 splines and a spool. It held up fine for mid 9's. However I just got my Billingsley unit and it is a wicked piece of work. 
So that you know, you cannot run a Strange aluminum center section for extended periods on the street. You'll need to consider a diff cooler or something else.
Mine has 40 splines in it that are gun drilled. The 30 spline axles from Moser weigh 20 pounds each complete with backing plates and bearings. The 40 splines weigh 17 pounds complete with backing plates and bearings. The total assembled axle with roll bar, center section, Strange brakes and rotors weighs 175 pounds. Moser 12 bolt, spool, 30 splines, BMR Xtreme swaybar and no brakes weighs over 230 pounds!
So that you know, you cannot run a Strange aluminum center section for extended periods on the street. You'll need to consider a diff cooler or something else.
Mine has 40 splines in it that are gun drilled. The 30 spline axles from Moser weigh 20 pounds each complete with backing plates and bearings. The 40 splines weigh 17 pounds complete with backing plates and bearings. The total assembled axle with roll bar, center section, Strange brakes and rotors weighs 175 pounds. Moser 12 bolt, spool, 30 splines, BMR Xtreme swaybar and no brakes weighs over 230 pounds!
03-11-2004, 11:23 AM
#19
The Bull
BTW, My 12 bolt was in pristine condition so I could have layed into it harder. But then I'd be out money anyway. So I found a good home for it, someone else here on the board just purchased it from me.
03-11-2004, 05:27 PM
#20
Originally Posted by DERTY
You made the right choice. I had a 12 bolt with 30 splines and a spool. It held up fine for mid 9's. However I just got my Billingsley unit and it is a wicked piece of work.
So that you know, you cannot run a Strange aluminum center section for extended periods on the street. You'll need to consider a diff cooler or something else.
Mine has 40 splines in it that are gun drilled. The 30 spline axles from Moser weigh 20 pounds each complete with backing plates and bearings. The 40 splines weigh 17 pounds complete with backing plates and bearings. The total assembled axle with roll bar, center section, Strange brakes and rotors weighs 175 pounds. Moser 12 bolt, spool, 30 splines, BMR Xtreme swaybar and no brakes weighs over 230 pounds!
So that you know, you cannot run a Strange aluminum center section for extended periods on the street. You'll need to consider a diff cooler or something else.
Mine has 40 splines in it that are gun drilled. The 30 spline axles from Moser weigh 20 pounds each complete with backing plates and bearings. The 40 splines weigh 17 pounds complete with backing plates and bearings. The total assembled axle with roll bar, center section, Strange brakes and rotors weighs 175 pounds. Moser 12 bolt, spool, 30 splines, BMR Xtreme swaybar and no brakes weighs over 230 pounds!
my DTS 12 bolt, complete stock rear brakes, 33 spline solid axles, lightweight richmond steel spool, BMR sway bar was over the scale max of 300 lbs.
A few pounds off the car with that purchase
