Pressure Plate

petehoovie

petehoovie

Well-known member
Wondering which is the superior design....9" '34 Sedan - Street

#1
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or #2

iu
 
I ordered a replacement clutch from RAM and they sent me a three finger design (like number two). I believe the original clutches were three finger design, but I can't say that for sure.

The three finger design uses the centrifical force of the spinning clutch to add pressure to the pressure plate - as the engine speeds up, it pushes down harder (you can see the weights in your picture).

My upgraded engine will use a diaphragm style of clutch (sort of like your picture #1, but with fingers all the way around). Apparently they are easier on your left leg. ;)
 
#1's started with 29 A's, went thru 34. 28 A's were the multi disk things the early racer's liked
 
I think I found my answer at the Fort Wayne Clutch website.

#1 is for a RECESSED / STEPPED FLYWHEEL

#2 is for a FLAT, NON-RECESSED STYLE FLYWHEEL
 
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petehoovie said:
I think I found my answer at the Fort Wayne Clutch website.

#1 is for a RECESSED / STEPPED FLYWHEEL

#2 is for a FLAT, NON-RECESSED STYLE FLYWHEEL
Click to expand...

That is correct. Ideally do to design, weight and force needed to actuate the clutch the #2 in your photos (35-up design) would be ideal. But if your 34 has the original flywheel it will take the other.
 
Thanks for your reply, Mike. I won't know what flywheel I have until I pull the ****** - my flywheel could have been replace sometime in the past. I'm thinking that if I do have an original recessed/stepped flywheel, I would be better off replacing it with a flat non-recessed style. Am I correct in assuming the original flywheel is strictly for a 9 inch clutch and that the 35-up flywheel will accommodate a 10-10 1/2 inch clutch?

Do you sell a kit that includes the 10-10 1/2 inch flywheel with ring gear, clutch disc and pressure plate?
 
The Long style applies more pressure to the clutch plate as RPM increases due to the fly weights, it is a much better pressure plate than the Borg Beck.
 
petehoovie said:
Thanks for your reply, Mike. I won't know what flywheel I have until I pull the ****** - my flywheel could have been replace sometime in the past. I'm thinking that if I do have an original recessed/stepped flywheel, I would be better off replacing it with a flat non-recessed style. Am I correct in assuming the original flywheel is strictly for a 9 inch clutch and that the 35-up flywheel will accommodate a 10-10 1/2 inch clutch?

Do you sell a kit that includes the 10-10 1/2 inch flywheel with ring gear, clutch disc and pressure plate?
Click to expand...

The 48 prefix flywheel only works on 9” clutches and will not accommodate a 10” etc without drilling it. With a stock 34 trans case you can only use a 9” 35 and later type anyways.
We sell clutch kits but in terms of flywheels, all I would have are used ones
 
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Today I removed the clutch from my 1934 ton and a half truck. It has the Borg & Beck style with 6 fingers (#1). The plate measures 10". Green book tells me this was truck only as is the flywheel. I haven't looked for a replacement as yet. I
 
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