I own a 1929 AA, when I took it apart, it had a 10" clutch disc in it. I also own a 1930 AA swamp buggy, when I took it apart, it had a 10' clutch disc in it. It is my under standing that all the A automobiles feft the factory with 9' clutch discs. Is it safe to assume that all the AA's left the factory with 10' clutch discs? Some model A'ers seem to think a 10" clutch work in a model A automobile pressure plate and flywheel? I hope someone can clear this up for me.
Thanks Nick c
Clutch disc diameters?
- Neil Wilson
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Re: Clutch disc diameters?
The August 1, 1929 Ford parts price list has AA parts for the clutch disc clutch disc assembly and clutch pressure plate and cover assembly. No dimensions are given. And, I don't know about interchangeability. Hopefully someone can explain.
Regards, Neil Wilson
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Re: Clutch disc diameters?
I thought that was the difference between the truck and car engines? I think the 10" would work in a car, but don't quote me on that one.
Red
Red
Re: Clutch disc diameters?
The flywheel is the same in the A car & AA truck after the introduction of the single disc clutch. The car can use the 10" clutch disc which was in the AA. My 31 AA has the 10" clutch disc. There was approximately 1/4" clearance from the outer diameter of the clutch disc to the flywheel inside diameter.
The pressure plate completely covered the 10" clutch disc. During Model AA production, the 10" clutch disc was used with pressure plate springs of a thicker wire diameter in order for the AA clutch to prevent slippage under heavy loads.
With the AA trucks these days not being used to haul really heavy loads, either the 9" clutch disc or the 10" clutch disc should be fine. The 10" clutch disc would be fine in the A car, especially ones that have modified engines. The pressure plate springs should not really matter that much unless the truck is being used to haul heavy loads.
If heavier pressure plate springs are desired, take the pressure plate apart and get springs that are the next wire size thicker and use them. Be aware that heavier pressure plate springs would cause the clutch pedal to be harder to push.
The pressure plate completely covered the 10" clutch disc. During Model AA production, the 10" clutch disc was used with pressure plate springs of a thicker wire diameter in order for the AA clutch to prevent slippage under heavy loads.
With the AA trucks these days not being used to haul really heavy loads, either the 9" clutch disc or the 10" clutch disc should be fine. The 10" clutch disc would be fine in the A car, especially ones that have modified engines. The pressure plate springs should not really matter that much unless the truck is being used to haul heavy loads.
If heavier pressure plate springs are desired, take the pressure plate apart and get springs that are the next wire size thicker and use them. Be aware that heavier pressure plate springs would cause the clutch pedal to be harder to push.
- Chris Haynes
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- Model Year: 1930
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Re: Clutch disc diameters?
I would like to find a 10" with the spring loaded center section. That takes the lurch out of start ups.
- vtwinsideways
- Posts: 452
- Joined: March 19th, 2010, 6:37 pm
- Body Type: 82-A, 88-A
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- Location: Taylorville IL
Re: Clutch disc diameters?
A'ers who trim some weight off of their flywheels (in some cases 20-30 lbs) often look for the 10 inchers to get a little more grab. It's nearly as easy to just switch to the v8 set-up which is more commonly available. Luke
"I get all my exercise jumping to conclusions."
Luke in Illinois
Luke in Illinois
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- Body Type: 75-A
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Re: Clutch disc diameters?
Anyone wanted a spring loaded center in the clutch center. Bring your old clutch to a local auto parts house and ask them to match you up with a clutch dic. Don't ask for a clutch for an 30 AA ford truck. They won't have one. Tell them it's for a FORD. Make sure the splines are the same. 10" clutch is fine, and a 9" clutch will work well. Most of these old trucks will never work hard as they were in their days. Most of them may still have the factory clutch after 80 yrs not bad hau! Shelby, Sacramento.
- Erskine48
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Re: Clutch disc diameters?
My clutch shop had a new disc made for my 27 Erskine by a race clutch shop! Bob E.
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Re: Clutch disc diameters?
I took the transmission out of my '34 and looked at the clutch. It is a 10" diameter spring loaded center section. The splines do line up with a model A car and truck and V8 3 speed. I looked in the Macs catalog and they have a 10" clutch for a 3 speed V8 that I'm am going to get. I thought I'd let you guys know if you were thinking about getting 10" clutches.
Red
Red