Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 05-04-2021, 05:57 PM   #1
russcc
Senior Member
 
Join Date: May 2010
Posts: 2,871
Default Purpose of the spring around the OD of brake drum ?

What is the purpose of a spring that fits tightly around the outside of a brake drum ? Thank you.
russcc is offline   Reply With Quote
Old 05-04-2021, 06:35 PM   #2
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 8,732
Default Re: Purpose of the spring around the OD of brake drum ?

It's a sound deadener to stop the drum "ringing".

I think.

Or maybe to assist in heat dissipation.

In other words I don't know but am prepared to have a wild guess!

Mart.
Mart is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 05-04-2021, 06:48 PM   #3
V8COOPMAN
Senior Member
 
V8COOPMAN's Avatar
 
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,106
Default Re: Purpose of the spring around the OD of brake drum ?

Quote:
Originally Posted by Mart View Post
It's a sound deadener to stop the drum "ringing".

I think.

Or maybe to assist in heat dissipation.

In other words I don't know but am prepared to have a wild guess!

Mart.

Mart about has it! The spring is supposed to resist a harmonic of sorts that can develop under some conditions, and which can result in noise and squealing. They say that the spring tended to help resist the squealing. And any of you old enough to have watched drums being turned years ago will probably remember the tech wrapping and stretching that big strap around the drum before machining. I believe it's purpose was similar. DD
__________________
Click Links Below __


'35-'36 W/8BA & MECHANICAL FAN


T5 W/TORQUE TUBE
V8COOPMAN is offline   Reply With Quote
Old 05-05-2021, 06:15 AM   #4
miniceptor86
Senior Member
 
miniceptor86's Avatar
 
Join Date: Aug 2019
Location: McGregor, IA
Posts: 230
Default Re: Purpose of the spring around the OD of brake drum ?

No No it’s to keep the cast iron from cracking under pressure and repeated heat cycles like the blocks. Unfortunately this never caught on with the block as there was a controversy as to wether they should be wrapped longitudinal or transversally and no one ever thought to do both.

Springs were for noise damping.
__________________
Cheers,
Jim&Sandy
McGregor, IA
miniceptor86 is offline   Reply With Quote
Old 05-05-2021, 07:28 AM   #5
Tim Ayers
Senior Member
 
Join Date: May 2010
Location: NJ
Posts: 6,144
Default Re: Purpose of the spring around the OD of brake drum ?

Quote:
Originally Posted by miniceptor86 View Post
No No it’s to keep the cast iron from cracking under pressure and repeated heat cycles like the blocks. Unfortunately this never caught on with the block as there was a controversy as to wether they should be wrapped longitudinal or transversally and no one ever thought to do both.

Springs were for noise damping.
This is what I've been told as well. I have some that came on some old drums. They are very stiff and take some effort to put on.
Tim Ayers is offline   Reply With Quote
Old 05-05-2021, 09:03 AM   #6
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,369
Default Re: Purpose of the spring around the OD of brake drum ?

Sponsored Links (Register now to hide all advertisements)
A person may be surprised to know how much a brake drum expands during a hard braking action.
rotorwrench is offline   Reply With Quote
Old 05-05-2021, 09:14 AM   #7
325w
Senior Member
 
Join Date: Feb 2011
Location: Arlington, Texas
Posts: 378
Default Re: Purpose of the spring around the OD of brake drum ?

Drums are the most abused parts on the car. Along with the clutch and flywheel. Then the folks that replace the brake lining without turning the drums. Sorry got on a box for a second.
325w is offline   Reply With Quote
Old 05-05-2021, 09:18 AM   #8
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,965
Default Re: Purpose of the spring around the OD of brake drum ?

Quote:
Originally Posted by rotorwrench View Post
A person may be surprised to know how much a brake drum expands during a hard braking action.

Yup, "brake fade" and drum expansion; and that sinking feeling as the pedal keeps getting closer to the floor ;-(
glennpm is offline   Reply With Quote
Old 05-05-2021, 02:40 PM   #9
1931 flamingo
Senior Member
 
1931 flamingo's Avatar
 
Join Date: May 2010
Location: new britain,ct 06052
Posts: 9,389
Default Re: Purpose of the spring around the OD of brake drum ?

Weren't they used on the Model A to prevent chattering if the drums had been turned too much??
Paul in CT
1931 flamingo is offline   Reply With Quote
Old 05-05-2021, 03:44 PM   #10
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 1,073
Default Re: Purpose of the spring around the OD of brake drum ?

And rotors compress and get skinnier. Nope but drums do expand and the large rubber was used to keep harmonics down , noise and vibration while turning . I still use a bungie when turning some steel .
Ggmac is offline   Reply With Quote
Old 05-05-2021, 04:22 PM   #11
miniceptor86
Senior Member
 
miniceptor86's Avatar
 
Join Date: Aug 2019
Location: McGregor, IA
Posts: 230
Default Re: Purpose of the spring around the OD of brake drum ?

It amazes me that the drums ever stayed together. The area were the lug bolts are seems very thin to me and hardly capable to support the pressure applied and heat generated by the shoes.
__________________
Cheers,
Jim&Sandy
McGregor, IA
miniceptor86 is offline   Reply With Quote
Old 05-05-2021, 04:29 PM   #12
Jack E/NJ
Senior Member
 
Jack E/NJ's Avatar
 
Join Date: May 2010
Posts: 2,171
Default Re: Purpose of the spring around the OD of brake drum ?

Gotta have them springs when they look this good even though you can't see them most of time. Jack E/NJ


Attached Images
File Type: jpg drumdamp.jpg (41.3 KB, 214 views)
Jack E/NJ is offline   Reply With Quote
Old 05-05-2021, 04:44 PM   #13
Tim Ayers
Senior Member
 
Join Date: May 2010
Location: NJ
Posts: 6,144
Default Re: Purpose of the spring around the OD of brake drum ?

Quote:
Originally Posted by miniceptor86 View Post
It amazes me that the drums ever stayed together. The area were the lug bolts are seems very thin to me and hardly capable to support the pressure applied and heat generated by the shoes.
On an OEM drum, that portion of the drum is stamped steel. That center is welded to the cast iron drum surface.
Tim Ayers is offline   Reply With Quote
Old 05-05-2021, 04:44 PM   #14
Tim Ayers
Senior Member
 
Join Date: May 2010
Location: NJ
Posts: 6,144
Default Re: Purpose of the spring around the OD of brake drum ?

Quote:
Originally Posted by Jack E/NJ View Post
Gotta have them springs when they look this good even though you can't see them most of time. Jack E/NJ


Jack,

Where did you get those nice new springs? Mine are all cruddy and rusty.

Thanks,

Tim
Tim Ayers is offline   Reply With Quote
Old 05-05-2021, 07:16 PM   #15
Jack E/NJ
Senior Member
 
Jack E/NJ's Avatar
 
Join Date: May 2010
Posts: 2,171
Default Re: Purpose of the spring around the OD of brake drum ?

>>>Where did you get those nice new springs? Mine are all cruddy and rusty.>>>


Heh-heh. Mine are all cruddy, rusty or missing too. I posted a photo of a nitpicker's drum. 8^) Jack E/NJ
Jack E/NJ is offline   Reply With Quote
Old 05-05-2021, 11:36 PM   #16
Tinker
Senior Member
 
Tinker's Avatar
 
Join Date: May 2010
Location: MN
Posts: 7,053
Default Re: Purpose of the spring around the OD of brake drum ?

Quote:
Originally Posted by 325w View Post
Drums are the most abused parts on the car. Along with the clutch and flywheel. Then the folks that replace the brake lining without turning the drums. Sorry got on a box for a second.

Or don't know about arching your brake pads.
Tinker is offline   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

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 05:44 PM.