11 inch clutch

Art Newland

Art Newland

Well-known member
Anyone using an 11 inch clutch assembly in a F1 pickup?

I'm just wondering how unruly this setup would be? Clutch pedal pressure stiffness? Engine responsiveness?

My truck has a 9.5" car clutch in it that needs replaced, I'd like to put it back to a stock 10" but don't have the correct flywheel, I do have a nice 11" flywheel with new pressure plate and disk. My truck also has a 9" rear-end with 3.70 gears that can take some slipping to get her rolling on an up-hill grade. What do you think? :confused:
 
Clutch size depends on what you want to end up with. Large diameter clutches are for low end pulling power (heavy trucks, stump pulling, etc). Smaller diameter clutch is for acceleration, ease of operation.
 
I see posts occasionally about how hard it is to depress the peddle on 11" clutches but, I used the original 11" flywheel and pressure plate on my pickup, just replaced the disc, works fine with no real noticeable extreme or extra effort needed. Maybe my 70+ year old legs are stronger than some other folks legs are.
 
I have no problems with the 11 inch clutch in my 40. It has been there since 1989. The only problem is you have to pull the oil pan to replace it. But it does make me wonder what the previous owner was doing to need a larger clutch.
 
Art, Stay with a 10 in. clutch. The weight of the pressure plate, etc and the need for the 11 in. clutch bell housing are negatives. plus, you are putting more load on the rear main, I think. Just not worth it. I see no gain in a pick up.
 
I have an 11" clutch in my 50 2dr custom. I'm running a 286 CI flathead with a 93 Mustang WC T-5 trans and 3:50 rear from a Maverick. I don't find it be any problem with the pressure needed to depress the clutch even when in stop and go traffic and I'm 79 years young. Been driving this setup for about 20 years. Clutch hasn't slipped yet.
 
flathead4rd said:
I have an 11" clutch in my 50 2dr custom. I'm running a 286 CI flathead with a 93 Mustang WC T-5 trans and 3:50 rear from a Maverick. I don't find it be any problem with the pressure needed to depress the clutch even when in stop and go traffic and I'm 79 years young. Been driving this setup for about 20 years. Clutch hasn't slipped yet.
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The issue in your application is it is limiting the acceleration. If acceleration is something your not that interested in, then wouldn't be that much of a cocern. In a lighter car it would be a bigger consideration, in a heavier vihcile not so much. It is totally a personal decision, just letting people know some of the pro & cons.
 
So what really is the difference in weight between a 10" pressure plate and an 11" plate? I seriously doubt that anyone could tell the difference in acceleration between the two in a flathead.
 
The 11" clutch is for truck applications. When durability is more important than performance, there's no reason not to use it.

Mart.
 
Running one in my little 34 pickup.
Installed the lightest springs available. Works great no complaints after 10 years.
 
flatjack9 said:
So what really is the difference in weight between a 10" pressure plate and an 11" plate? I seriously doubt that anyone could tell the difference in acceleration between the two in a flathead.
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Has little to do with total weight and it makes a big difference! It has to do with inertia, the further a weight is from the center of rotation the greater the inertia. The inertia is resistance to a change in rotational speed and it is very apparent if you have a the chance to drive both.
 
I am well of aware of the effects of inertia. So you are telling me you can feel the difference between a 10" and an 11" clutch? The flywheel is the same for both and the radial difference in pressure plate and clutch disc is 1/2" and the effect of the larger clutch disc would be imperceptible. That and a flathead is rarely spun more then 3000 rpm in a street application. Give me a break. Listen to the people who drive them.
 
I have had 11 inch and 10 in the truck. I really didnt notice too much difference in pedal pressure but i think the 10 inch will help you get up to speed faster or use the 11 if you are going to use on the farm. I have the 10 inch in my truck and the acceleration is great.
 
I have had an 11 inch in my 49 F1 for the past 45 years because that is what it came with. Clutch pedal pressure feels right to me ... and no noticeable difference in pedal pressure to anything else I've driven.
 
The 11-inch clutch was usually packaged with the optional 4-speed transmission for the F1 pickups. It is standard for F2 pickups on up to trucks. No one was worried about fast rpm build on a truck and most likely would'nt be too concerned about it in an F1 either. The 11-inch is overkill on an F1 with a light duty transmission but it will still work just the same.


If I was building a light body car with a hopped up V8 then I'd go with a 9-inch and maybe even lighten the flywheel some. That's where a person would notice the rapid engine rpm build.
 
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