...

Go Back   Lateral-g Forums > Technical Discussions > Transmission and Rear End
User Name
Password



Reply
 
Thread Tools Display Modes
  #21  
Old 03-12-2008, 05:05 PM
another69 another69 is offline
Junior Member
 
Join Date: Mar 2008
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I know alot of us (myself included) my not really NEED a floater, but if the cost difference is only a couple hundred bucks on top of about 3 grand, then why not? It is without a doubt a superior design, right? Whats wrong with a little overkill, especially in the drivetrain? Is there any application out there where semi floaters are better?
Reply With Quote
  #22  
Old 03-12-2008, 05:30 PM
Silver69Camaro Silver69Camaro is offline
Senior Member
 
Join Date: Nov 2005
Location: Auburn, WA
Posts: 270
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by another69
couple hundred bucks on top of about 3 grand
That's why not, IMO. How much more do you want to spend? A good set of 31-spline axles with 3.150" bearings is somewhat overkill for most of us.

I'd be willing to bet a SF axle is slightly lighter, both in unsprung and rotating mass. AND you have all the brake kits you want that will bolt on.

With that mentality, you might was well go for a 4" driveshaft. But it's only money.
__________________
Matt Jones
Mechanical Engineer
Art Morrison Enterprises
Reply With Quote
  #23  
Old 03-12-2008, 06:48 PM
another69 another69 is offline
Junior Member
 
Join Date: Mar 2008
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Default

It just seems to me that a little extra insurance toward drivetrain strength would be more of an investment than a waste of money. Besides, look at the money most of us spend on our cars- a couple hundred bucks is barely felt. (price a good paintjob lately?) I think I'd rather put it toward a stronger axle than chrome. But now you've got me thinking about a 4" driveshaft! Maybe not.
Reply With Quote
  #24  
Old 03-13-2008, 04:30 AM
tyoneal's Avatar
tyoneal tyoneal is offline
Supporting Member
 
Join Date: Jun 2006
Posts: 1,365
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Silver69Camaro View Post
That's why not, IMO. How much more do you want to spend? A good set of 31-spline axles with 3.150" bearings is somewhat overkill for most of us.

I'd be willing to bet a SF axle is slightly lighter, both in unsprung and rotating mass. AND you have all the brake kits you want that will bolt on.

With that mentality, you might was well go for a 4" driveshaft. But it's only money.
---------------------------------------------
The Bearing you mentioned. Is that the Big Ford Bearing you are referring to?

I've got the Strange Center section and housing, Their 31 splined Axles, Tru-Trac, and it uses the large Ford End Bearings.

From what has been explained to me from Mark Magers, and what I have read since read. This set up is plenty more than enough for a PT car that gets lots of Track time.

That's why I wasn't so keen of the full floater, unless you just want one, and Lord knows I certainly have made similiar decisions from time to time.

Take Care,

Ty
__________________
Project, "EnGULFed"
1964 Gulf Liveried, Corvette, "Grand Sport"
===========================
Ty O'Neal
"She Devil" aka. Betty
1969/70 Camaro SS
427 LS3, 600
Keisler Road and Track T-56
Full size 3 link and custom roll cage
315mm tires on rear, should fit the same on front. Worked to design a more effective shape.
======================
"Chester's '65"
1965 Buick Riviera
Aiming for true PT Status with
the best available from the 70's and 80's
======================
Reply With Quote
  #25  
Old 03-13-2008, 07:46 AM
Silver69Camaro Silver69Camaro is offline
Senior Member
 
Join Date: Nov 2005
Location: Auburn, WA
Posts: 270
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by tyoneal View Post
---------------------------------------------
The Bearing you mentioned. Is that the Big Ford Bearing you are referring to?
Yes it is. Specifically the tapered style bearing.
__________________
Matt Jones
Mechanical Engineer
Art Morrison Enterprises
Reply With Quote
  #26  
Old 03-13-2008, 08:57 AM
Blown353 Blown353 is offline
Senior Member
 
Join Date: Nov 2004
Location: Central Valley, CA
Posts: 916
Thanks: 0
Thanked 87 Times in 34 Posts
Default

Quote:
Originally Posted by Silver69Camaro View Post
With that mentality, you might was well go for a 4" driveshaft. But it's only money.
LOL! However some of us guys with long single driveshafts actually did the math and found out that a 4" driveshaft was necessary to keep a comfortable margin away from hitting the critical speed of the shaft at the speeds the car can and occasionally attains. Might as well spec all your parts to be safe at the maximum operating capability of the vehicle!

With my combination I found that I was within 150 rpm of the critical speed of a Mark Williams 3.5" aluminum driveshaft at the top of 4th gear, which I do hit every now and again. 150rpm is NOT a comfortable "safety margin" for me especially when it comes to something like critical speed which can and does have very dangerous consequences. A 3.5" Aluminum MMC shaft had about a 700rpm margin, and a 4" aluminum shaft had about a 850 rpm margin. The prices were all very similar so I chose what would give me the biggest margin of safety.
__________________
1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.

Last edited by Blown353; 03-13-2008 at 09:02 AM.
Reply With Quote
  #27  
Old 03-13-2008, 11:00 AM
Silver69Camaro Silver69Camaro is offline
Senior Member
 
Join Date: Nov 2005
Location: Auburn, WA
Posts: 270
Thanks: 0
Thanked 0 Times in 0 Posts
Default

That comment was within the context of this discussion, which is using equipment that isn't necessary for a particular application and is only purchased for a "cool factor" or otherwise (something other than a "need" basis).

If you NEED a 4" driveshaft, then you don't have a choice. Same goes for a FF axle. If you DON'T need a 4" shaft, than what's the point? You'll just spend more money on something that is oversized. Bigger isn't always better.

Perhaps I'm too anal about efficiency. I guess that's why I do what I do. Sure, every part should not be sized such that no margin of error exists, but the FOS designed into every part should reasonable enough to allow for unusual loads and situations, but not so much that excess weight and bulk degrades vehicle performance.
__________________
Matt Jones
Mechanical Engineer
Art Morrison Enterprises
Reply With Quote
  #28  
Old 03-13-2008, 11:34 AM
ccracin's Avatar
ccracin ccracin is offline
Senior Member
 
Join Date: Sep 2006
Location: Rostraver, PA
Posts: 2,067
Thanks: 0
Thanked 4 Times in 4 Posts
Default

Quote:
Originally Posted by tyoneal View Post
---------------------------------------------
The Bearing you mentioned. Is that the Big Ford Bearing you are referring to?

I've got the Strange Center section and housing, Their 31 splined Axles, Tru-Trac, and it uses the large Ford End Bearings.

From what has been explained to me from Mark Magers, and what I have read since read. This set up is plenty more than enough for a PT car that gets lots of Track time.

That's why I wasn't so keen of the full floater, unless you just want one, and Lord knows I certainly have made similiar decisions from time to time.

Take Care,

Ty
I think you will have great success with that rear. From my past and the research I did we ended up with the same thing. Although I had the housing built locally.

Later,
__________________
Chad
Instagram - @cctek
https://https://www.facebook.com/CCTek

68 Chevy Pickup Project
Build Thread: https://lateral-g.net/forums/showthread.php4?t=7505

THANKS TO: A&M Machine and Fabrication, CCTek (http://www.candctek.com), Hermance Design(www.hermancedesign.com), Paradise Road Rod & Custom, Harry Opfer Welding, Wegner Automotive Research, Clayton Machine Works
Reply With Quote
  #29  
Old 03-13-2008, 11:48 AM
Blown353 Blown353 is offline
Senior Member
 
Join Date: Nov 2004
Location: Central Valley, CA
Posts: 916
Thanks: 0
Thanked 87 Times in 34 Posts
Default

Quote:
Originally Posted by Silver69Camaro View Post
Perhaps I'm too anal about efficiency. I guess that's why I do what I do. Sure, every part should not be sized such that no margin of error exists, but the FOS designed into every part should reasonable enough to allow for unusual loads and situations, but not so much that excess weight and bulk degrades vehicle performance.
Nah, you just sound like a mechanical engineer. So am I... and I agree with you 100%.
__________________
1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
Reply With Quote
  #30  
Old 03-13-2008, 02:19 PM
ccracin's Avatar
ccracin ccracin is offline
Senior Member
 
Join Date: Sep 2006
Location: Rostraver, PA
Posts: 2,067
Thanks: 0
Thanked 4 Times in 4 Posts
Default

Quote:
Originally Posted by Blown353 View Post
Nah, you just sound like a mechanical engineer. So am I... and I agree with you 100%.
Make that 3. So am I and I agree as well.
__________________
Chad
Instagram - @cctek
https://https://www.facebook.com/CCTek

68 Chevy Pickup Project
Build Thread: https://lateral-g.net/forums/showthread.php4?t=7505

THANKS TO: A&M Machine and Fabrication, CCTek (http://www.candctek.com), Hermance Design(www.hermancedesign.com), Paradise Road Rod & Custom, Harry Opfer Welding, Wegner Automotive Research, Clayton Machine Works
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 04:42 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright Lateral-g.net