Flywheel and pressure plate options 8BA

[flatford39]

My 8BA came without a flywheel or pressure plate. I am hooking it up to a 39 top loader for use in my 31 Roadster. Pretty stock engine overall. What are my options for flywheel and pressure plates. Can I use one out of a 59A without re-drilling or are 8BA's proprietary.

 

[V8COOPMAN]

You must use the dedicated flywheel on a '49-'53, as it dictates the proper starter alignment. The pic below shows the differences. Note that the 8BA-type wheel has clutch bolt holes drilled all the way through, for easy ID. DD

 

[flatford39]

Thank you...what about pressure plates???

 

[Walt Dupont--Me.]

You must use the 8BA wheel. I've used the 9-1/2 pressure plate and a 9in. early disc for your early trans. OR, if all you can find is a bigger wheel 10in or 11in. you can have them redrilled and balanced for the early 9in. clutch and pressure plate. Walt

 

[51504bat]

I'm running an 8ba in my '39 p/u. I use the 9 1/2 inch pressure plate with the 9 inch clutch disc with the big splines for the stock '39 trans. Ft. Wayne clutch can supply you with a 9 1/2 inch disc with the proper splines for your trans if you don't want to run the 9 incher. IMO you don't need the 10 or 11 inch flywheel and clutch assembly. If you can't find a flywheel close to you I've got all 3 sizes with clutch assembly cores. PM if interested.

 

[Binx]

The correct combination of parts to match an 8BA flywheel to an earlier transmission is:


10” Pressure Plate PN# 19a-7563 ’46 -’48 car or ’46 -’52 pickup
10” Clutch Disk PN# 51a-7550 ’46 -’48 car or ’46 -’52 pickup
[FONT=&quot]Throw-out Bearing PN# 78-7580

Lonnie
[/FONT]

 

[flatford39]

Thank you very much.

 

[rotorwrench]

Many of the F1 pickups had a 10-inch Long type clutch that is same back to 1942 but they had an 8BA flywheel set up for them at the factory. These aren't easy to find now days. The 1949 through early 51 Mercury used the 10-inch 1 3/8" spline Borg & Beck clutch but you also need the flywheel with the six evenly spaced bolt holes. Most machine shops can drill your flywheel for whatever clutch you want. They just need the base circle of the bolt holes and spacing so they can set up their index table on a mill. A person could do that and have the wheel refaced at the same time. All of the different clutch covers have a different base circle diameter for the bolt holes. For a light body car, the old 9-inch Long type works very well.