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Old 06-10-2011, 10:33 PM   #1
bill hincher
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Member#: 280288
Join Date: Apr 2011
Location: Toledo,Ohio USA
Default building my own flex plate

I needed to build a flex plate for a 6G72 V 6 Mitsubishi engine so I got some HSLA commercial grade 1/8 in plate and marked the center with a small starter hole, you can see the original flex plate was built from 1/16th but its shape was fairly close

this machine is called a nibbler or pullmax style machine, it was built for making circles, but I also build my own dies for what ever purpose I want to use

a flex plate is just that, it flex's and its also like a spring, it gets pushed forward under load, the flex plate has to move about .060 so a bit of a bend not only keeps a little of pressure against the load but when you bend steel, you double its strength without adding weight

I opened the center hole so I could mount my adapter and then drilled it to accept the Ford C-4 torque converter and this was one of the reasons the C 4 was chosen, it has a 10.5 in bolt circle pattern, which was just small enough to fit inside the ring gear that was selected, the GM converter was 10.75 and would not fit

I mounted the flex plate to the coupler just for the center, then I trimmed the outer diameter to size for the ring gear
this is the finish look, I need to pay some attention to detail but I was pretty happy with it, with the smaller ( 10 in or smaller ) converter I will be mounting the starter as a reverse set up but I kept the ring gear on the flex plate so anyone could select and buy what ever stall speed converter they may want
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Old 06-15-2011, 07:49 PM   #2
69subaru360
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Chapter/Region: NESIC
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1998 2.5 RS

Default

That is neat. How had would it be to make an EJ engine to GM automatic flexplate? Someday way in the future I might want to have one made.
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Old 06-15-2011, 11:34 PM   #3
bill hincher
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Default

I did the GM adaptor a long time ago, this system adapts the wide block 464 or the narrow block 463 or the g54b to any GM auto trans




I could do a Gm adapter but I think the C 4 Ford would be a better build


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Old 06-16-2011, 12:21 AM   #4
69subaru360
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1995 WRX
1998 2.5 RS

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Nice work! I was asking about GM because I have experience building GM transmissions. I'd be lost on the ford stuff. Someday I'd like to mate a powerglide to an EJ engine.
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Old 06-16-2011, 07:11 AM   #5
bill hincher
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Default

the starter is the problem, it will have to be a reverse starter to clear most sub frames in most cars, so the Ford with the detachable bellhousing is the best chioce
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