Clutch Spring Assist - question

[Q1SVT]

Has anyone tested the spring rate or knows what it is?

The spring available is not for 351C or big blocks... They are for 302 or six cylinders [softer pressure plate]
That's okay for what I want. Looking for a spring to return clutch pedal to full up position, more so than assisting...

Since the bracket that holds the spring is not available, I'll fabricate something, I'm thinking a 2023 Steeda stang S550 spring @ 35# might be a good/better option.

Thanks

 

[Stanglover]

If you're referring to the clutch assist spring that mounts on the top of the pedal arm and the bracket, you do NOT need it there if you're using a diaphragm style clutch. I fact if you are using a diaphragm clutch, it MUST be removed and it can be a bi*ch to remove so be careful.
If you're using a long finger style (as original), then you need that spring.

 

[Q1SVT]

Thanks Stanglover and others

I know what you’re saying…. I’m going to a ford quadrant style, cable setup and those cars had a simple torsion spring to return pedal to top. The clutch setup for those cars need through out bearing to have a small offset from pressure plate…. Since ford went hydraulically they started using assisted clutch springs. I’m using a newer style double disk clutch good for my HP/TQ, but can handle 800+.

I’m trying to help my pedal to return fully to top. Looking for info on spring rate…. I have the spring for the six cylinders and can compress it by hand. Know steeda is 35#. I plan on setting up testing soon with one of the pedal supports while motor / trans is on engine stand… tuning clutch operation from pedal to pressure plate. Before installation. Reason why I have extra complete support for testing out of the vehicle…

 

[Q1SVT]

Ford mustang with about 200# clutch assist spring. Steeda 35#

 

[Stanglover]

Thanks Stanglover and others

I know what you’re saying…. I’m going to a ford quadrant style, cable setup and those cars had a simple torsion spring to return pedal to top. The clutch setup for those cars need through out bearing to have a small offset from pressure plate…. Since ford went hydraulically they started using assisted clutch springs. I’m using a newer style double disk clutch good for my HP/TQ, but can handle 800+.

I’m trying to help my pedal to return fully to top. Looking for info on spring rate…. I have the spring for the six cylinders and can compress it by hand. Know steeda is 35#. I plan on setting up testing soon with one of the pedal supports while motor / trans is on engine stand… tuning clutch operation from pedal to pressure plate. Before installation. Reason why I have extra complete support for testing out of the vehicle…

View attachment 96732

Ah well, that's a whole different kettle of fish. A different ball game all together.
Please let us know how it all works out.

 

[Q1SVT]

lol… yes she is a different kind of CAT, and she has been good to me since I ordered her new.
I switched teams after following Wayne Gapp carry his cats wheels down Detroit Drag Strip.

His finger prints are on our 4V heads as a ford engineer

 

[Hemikiller]

The overcenter spring is the same regardless of engine. Ford may have originally had individual springs, but it was distilled down to just the C8OZ-A spring.

 

[Stanglover]

Now I'm lost!!
What car exactly do you have? Nothing is listed on your intro on the left.

 

[Q1SVT]

The overcenter spring is the same regardless of engine. Ford may have originally had individual springs, but it was distilled down to just the C8OZ-A spring.

View attachment 96742

Thanks… is that page from an interchange book?
I’m still trying to figure out rate… I think the C8OZ is more than needed. Guess I need to stop by a head shop and get them to measure one

 

[Q1SVT]

Now I'm lost!!
What car exactly do you have? Nothing is listed on your intro on the left.

I started my Cleveland life with a used 70 4V cougar 4 speed from Ford’s B lot. Then purchased a new 73 2V C6 cougar and installed the 70 4V to get around insurance costs/ rules on performance. Someone ran into the 70 while it was parked.

 

[Hemikiller]

Thanks… is that page from an interchange book?
I’m still trying to figure out rate… I think the C8OZ is more than needed. Guess I need to stop by a head shop and get them to measure one

Came from the 65-72 Ford Master Parts Catalog. Unfortunately, I only have the final version. The earlier versions may have more info.

IMO the overcenter spring is not an "assist" device, merely a method to return the pedal without adding excessive pedal effort like the early cars with the extension spring. .