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Old 04-01-2016, 10:32 AM   #1
rayryan
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Default 9 inch pressure plate

I am looking for the bolt cyr. diameter for the 9" pressure plate used on the Model A when the flywheel is lightened. If someone has this info and could pass it on I would appreciate it. Thanks Ray
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Old 04-01-2016, 12:02 PM   #2
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Default Re: 9 inch pressure plate

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Originally Posted by rayryan View Post
I am looking for the bolt cyr. diameter for the 9" pressure plate used on the Model A when the flywheel is lightened. If someone has this info and could pass it on I would appreciate it. Thanks Ray
Hey Ray,
I'm sure that WE can help you, but I do not quite get what you want/need ?
Are you asking how to drill bolt hole pattern for a V8 style pressure plate on a lightened model a flywheel ...or what
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Old 04-01-2016, 01:46 PM   #3
rayryan
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Default Re: 9 inch pressure plate

yes that is what im looking for. All the other work i have done, but have not been able to find bolt hole pattern for the v8 pressure plate. I didn't weigh the wheel yet but i know it's a lot lighter just by taking it off the lathe.
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Old 04-01-2016, 03:24 PM   #4
Rowdy
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Default Re: 9 inch pressure plate

I can not find the attachment that was emailed to me several years ago to post. However be aware that the one that was shown in SOS speed several years ago had an error. I also think the one posted in SOS was the one for use with a flathead transmission so may not be the one you are looking for. Bolt pattern is the same though. Have you tried the search funtion to possibly find the info that has likely already been posted in the past? Rod
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Old 04-01-2016, 03:52 PM   #5
62pan
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Default Re: 9 inch pressure plate

This is what I used. Click on it twice to enlarge. Sorry it is so light.
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File Type: jpg clutch diagram bolt.jpg (15.3 KB, 90 views)
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Old 04-01-2016, 03:57 PM   #6
hardtimes
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Default Re: 9 inch pressure plate

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Originally Posted by rayryan View Post
yes that is what im looking for. All the other work i have done, but have not been able to find bolt hole pattern for the v8 pressure plate. I didn't weigh the wheel yet but i know it's a lot lighter just by taking it off the lathe.
Ok, now understood. There is a 'drawing/diagram' of how to lay out the bolt holes for attaching the V8 pressure plate to the model a flywheel.
You must have machinist skills/abilities, eh , to be asking for the drawings ? I just take my flywheel to a machinist friend (4e4 buddy ) and he does the math and machining.

Maybe doing a 'search' here the diagram with words like pressure plate and / or flywheel..will produce the drawings. Good luck with that though, as I can never seem to pull old subject matter to my satisfaction.

I'm sure that someone here, good with records/computer skills, will give you what you need here !

Last edited by hardtimes; 04-01-2016 at 03:58 PM. Reason: .......
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Old 04-01-2016, 04:15 PM   #7
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Default Re: 9 inch pressure plate

The bolt circle is 10.375"D for the 9" B&B style long clutch. The holes are three pairs 120 apart, separation between holes in each pair is 32 degrees. Use a rotary table! Do NOT try to use a P.P. as a template, I've seen several with the holes punched/stamped 1/8" off. If you want X/Y coords from the wheel center for CNC send me a P.M.
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Old 04-01-2016, 04:26 PM   #8
rayryan
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Default Re: 9 inch pressure plate

Thanks to all. I do have a CNC and this will do just fine.
This is my first time on this foram and i will be hear again.
Thanks very much: Ray
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