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02-06-2021, 02:05 PM | #1 |
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Join Date: Oct 2020
Location: Arizona
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8BA clutch size
I am using the stamped steel car bellhousing TOB that came with the engine when I bought it. I am going to idea T5 transmission from a Ford. The original clutch was a 9 1/2 ". Before I install the flywheel I want to make sure I can go to a bigger clutch that is easier to find compatible clutch disk for the Ford input shaft. My engine was just rebuilt, a thread on that earlier. Basic upgrades just want to make sure enough clutch.
So in that bellhousing what is an optimum clutch size so I can drill the flywheel. TIA |
02-06-2021, 02:33 PM | #2 |
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Location: San Antonio, Texas
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Re: 8BA clutch size
The 9.5 " clutch is OK for a flathead but there were several 10" clutches available for Mercury and Ford pickups. A lot depends on which type of clutch you want and whether the clutch throw out will work with the pressure plate. The 9.5" Long type clutch is set up for a 1 inch 10-spline transmission input shaft. There are clutches that will work with a T5 but I don't know if the T5 will easily fit up with the ford 8BA type stamped steel bell housing but where there is a will there is a way. A lot of flathead adapters are set up to work with the 49 to early 51 Mercury & truck half bell housing or the hogs head 4-speed truck half bell.
Last edited by rotorwrench; 02-06-2021 at 06:15 PM. |
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02-06-2021, 02:54 PM | #3 |
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Join Date: Oct 2020
Location: Arizona
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Re: 8BA clutch size
Speed Gem Transmission Adaptors makes a shelter plate for the T5 and that bellhousing. I am good with the original clutch size if it holds fine. You can find 9 1/2 disk that have the correct input spline.
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02-06-2021, 03:12 PM | #4 |
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Re: 8BA clutch size
Also beware .....the wimpy T5s have a 14-spline input, whereas the GOOD ones have a 26-spline input shaft. Maybe the Ford T5s are different, though. JSeery would know! DD
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02-06-2021, 03:26 PM | #5 |
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Location: Arizona
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Re: 8BA clutch size
I am in process of doing a complete rebuild of the T5. It was going into another project but decided to use it on this. It is all new 300 hp gears and a new chevy tail housing to move shifter forward.
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02-06-2021, 03:48 PM | #6 |
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Re: 8BA clutch size
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02-06-2021, 04:24 PM | #7 |
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Re: 8BA clutch size
Any stock 9 or 9.5 inch clutch will handle 200 hp easily and they can be made to handle 500 hp.
There is NO reason to put a 10 inch clutch on any flathead Ford engine. They are too big and heavy. |
02-06-2021, 04:32 PM | #8 |
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Re: 8BA clutch size
Ford input shaft:
Dia 1 1/16 Pilot .668 Splines 10 Length 7.18 What Pete said, a smaller diameter clutch assembly improves acceleration. |
02-06-2021, 07:17 PM | #9 |
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Re: 8BA clutch size
I have a 9 1/2 clutch on a stock 8BA flywheel and an adapter from power products, I think, I got it quite a few years back for 150 Bucks and all the hardware to go with it. I use the stock throwout bearing and arm along with a hydrolic clutch piston with a bracket welded to the bell housing. Works fine.
Gramps |
02-06-2021, 08:16 PM | #10 | |
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Re: 8BA clutch size
Quote:
And if you want to go as fast as Nascar, you can put in a 5.5 inch clutch. Engines really spool up quick with these. |
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