Pressure plate ID Q....

hardtimes

hardtimes

Well-known member
I have my A flywheel cut down and now need to decide on best pressure plate to use. Want ease of leg push pressure and also want one that does NOT tend to SLIP over time. I've been told that the diaphragm is the best/right pressure plate to achieve my goals.
So, If anyone uses and/or knows what part # of diaphragm pressure plate will work, with Model A flywheel, please give type vehicle and part # for me to buy.

And, are you aware of any downside to using a diaphragm pressure plate. This style seems to be newest innovation in automotive, no :confused:
 
Last edited:
This is what I am using: Just make sure you get your flywheel/pressure plate assembly balanced as a unit.
 

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  • Pressure Plate Sachs BBC1904.jpg
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My friend's 1949 Chevy pickup has a nice soft clutch pedal, and I believe it's a diaphram style, so they go back some years.
I wonder if Carl's is just as easy to push?
 
If you use the diaphragm pressure plate you have to relieve the opening of the fingers in order to clear the snout on the bearing retainer so the throughout bearing will work properly.

I have this type pressure plate in my 29 Roadster; it is very positive when engaged.

Ron
 
CarlG said:
This is what I am using: Just make sure you get your flywheel/pressure plate assembly balanced as a unit.
Click to expand...

Hey Carl,
You always seem to come to the rescue :) !
Now....what is the identification of this diaphragm unit ?

Yes, balance is the very next step ...after acquiring the part !
 
Ron in Quincy said:
If you use the diaphragm pressure plate you have to relieve the opening of the fingers in order to clear the snout on the bearing retainer so the throughout bearing will work properly.

I have this type pressure plate in my 29 Roadster; it is very positive when engaged.

Ron
Click to expand...

Thanks Ron,
By 'relieve' , I take it that you are saying to put the bearing retainer in the opening and grind the fingers until clearance is had..no ?

Yes, my 'research' has resulted in the same finding, i.e.- positive engagement , and less slippage ! That would/should give long life and peace of mind, eh ;) !

Now , what was the model/part # of the diaphragm unit that you used :)
 
Tom Wesenberg said:
My friend's 1949 Chevy pickup has a nice soft clutch pedal, and I believe it's a diaphram style, so they go back some years.
I wonder if Carl's is just as easy to push?
Click to expand...
Don't know if it equals your friend's truck, but it is pretty easy on my old arthritic legs.
 
CarlG said:
Just hover over the picture (or click on it), mfr & part # are there.
Click to expand...

Hey Carl,
Yup, arithmetic legs and unfortunately more....
I do not have the hover and click ability, but see some faint markings. If you can pm me with that info , I'd appreciate that :)
 
Is this just for a Model A or will this work in my 53 Merc.? Will I have to grind the fingers to clear the snout on the bearing retainer. I don't know if the Model A retainer is the same dia. as the V8 fords.
 
Bob C said:
On my computer I just put the cursor on the picture and
Sachs BBC1904 pops up.

Bob
Click to expand...

Hey Bob,
YOU are the man :) !!
I have no clue what you did or how you did it , but thanks !

I was unable to do what you did, and another barner couldn't figure it either. Maybe my computer has a neophyte operator, eh :p !

BTW...While doing a lot of research on this subject, ironically, I just ran across the SAME part number that you just confirmed. Thanks, again.
 
I've done this to a few A engine. I've lightened guite a few wheels, cut the lip off flush with the clutch surface, I've lightened some more than others by cutting some out of the wheel. The one in My B engine in my 31 Coupe is 35#. But back to the clutch, in all of them I use the 35-41 V8 9in. clutch and PP I have the wheel redrilled for the 9in. PP, I always have them balanced. I bye all my clutch and PP from Fort Wayne Clutch. There smooth and easy on the leg, Walt
 
Walt Dupont--Me. said:
I've done this to a few A engine. I've lightened guite a few wheels, cut the lip off flush with the clutch surface, I've lightened some more than others by cutting some out of the wheel. The one in My B engine in my 31 Coupe is 35#. But back to the clutch, in all of them I use the 35-41 V8 9in. clutch and PP I have the wheel redrilled for the 9in. PP, I always have them balanced. I bye all my clutch and PP from Fort Wayne Clutch. There smooth and easy on the leg, Walt
Click to expand...

Hey Walt,
Thanks for your input :) !
I run a 35 lb A flywheel with a Borg/Beck 9'' on the B in my '30 roadster. It has run great for years now. However, after talking with some very experienced/knowledgeable guys here...who are using a diaphragm pressure plate, I've decided to try this type equipment. At this time, I have a '32 B short block that is at the point of needing a pressure plate to balance with my flywheel (s). I have a 38lb Model A and an aluminum Stipe flywheel to chose from. I have been told that he diaphragm pressure plate gives very firm hookup with little, if any, slippage. And, that it is even easier on the left leg , than the B&B V8 9" style, which is a blessing if so.
BTW, Walt, does the pilot bearing have to be installed in the flywheel in order to have it balanced ?
 
No,the pilot bearing don't need to in to balance. My balancer does the wheel then bolts on the PP and balance that, The wheels are not out very far but I,ve seen a lot of PP out a long ways. Mark the PP and wheel so the pp will go back on in the right place. Walt
 
Walt Dupont--Me. said:
No,the pilot bearing don't need to in to balance. My balancer does the wheel then bolts on the PP and balance that, The wheels are not out very far but I,ve seen a lot of PP out a long ways. Mark the PP and wheel so the pp will go back on in the right place. Walt
Click to expand...

Hey Walt,
THANKS buddy for all your help, now and in the past :) !

Do you have any pictures of A/B completed engines that you can share examples of your work !
 
As a side note:

I made a conversion, using a multi disc bell housing and early transmission so I could use the correct early pedals; a regular flywheel was cut down to 35 pounds including the new ring gear, balanced and set up for the 9" V8 pressure plate; I had to modify the inside of the bell housing to clear the pressure plate.

I have since found, using the 10" diaphragm pressure plate, due to its low profile, no changes to the interior of the bell housing is required.

Ron Rude
 
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