Pressure plate clamping force...how much is too much? - 460 Ford Forum
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post #1 of 3 (permalink) Old 06-20-2013, 09:21 PM Thread Starter
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Pressure plate clamping force...how much is too much?

I am just about finished with the 521 DragWeek motor for my 66 Galaxie and I am undecided on what pressure plate to use. I have bought a 3200lb Mcleod diaphragm style unit but I am concerned it will still take two men and a boy to push the clutch pedal in. I had a 2300lb diaphragm type behind my 460 that worked just fine but I never ran it at the track. Is 3200lb overkill or do I need something like that to handle all that torque coupled with a 4400lb car? The transmission is a TKO600 5 spd.
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post #2 of 3 (permalink) Old 06-23-2013, 04:25 PM
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Originally Posted by AlanCasida View Post
I am just about finished with the 521 DragWeek motor for my 66 Galaxie and I am undecided on what pressure plate to use. I have bought a 3200lb Mcleod diaphragm style unit but I am concerned it will still take two men and a boy to push the clutch pedal in. I had a 2300lb diaphragm type behind my 460 that worked just fine but I never ran it at the track. Is 3200lb overkill or do I need something like that to handle all that torque coupled with a 4400lb car? The transmission is a TKO600 5 spd.
Clamp pressure will depend on type of disc as well HP, weight,rear gear, 1st gear ratio and driving style.
3200 is a lot of pressure , but if your running a organic disc you may need that much with you combination.
If it is a truly street strip car you will have to compromise.

If you want something with a lightened pedal pressure you can go with a six paddle sintered bronze disc, it has a high coefficient and will hold with a lot less pressure than a organic disc, like around 1400# plate load,BUT is very aggressive and will chatter , but it will hold with slicks, HP and weight.

Next up would be the Sintered Iron single disc with a Long style PP that is adjustable both in Clamp(static) pressure and centrifugal counter weight. In a race application you can get down to 500# along with 10 -12 grams of counter weight and it will hold 600HP or more at 4000#(car weight) as long as its geared right.

You need some slip either from the clutch or tires with that TKO in order to keep from breaking it. IMHO............

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Last edited by bbstickstang; 06-23-2013 at 05:51 PM. Reason: spelling
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post #3 of 3 (permalink) Old 06-23-2013, 11:36 PM Thread Starter
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Thanks for the input. You provided me with some very valuable information. I have similar concerns over the TKO also. I have not raced it and it was behind a mild 460PI before. I am contemplating putting the C6/Gearvendor back in it for DragWeek.
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