A twin disc clutch? - IMBOC
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post #1 of 9 (permalink) Old 04-24-2019, 11:28 PM Thread Starter
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Talking A twin disc clutch?

In days past a single disc clutch was the norm in production vehicles. You have the flywheel, a two sided friction disc, and a spring loaded pressure plate. When you push the clutch in, the pressure plate springs release allowing the friction disc to "free wheel," and allow for smooth gear changes.
Once you get up around 500 Hp and over 400 Ft/Lbs of torque, a normal single disc clutch will have a hard time connecting up the power to the transmission under hard use. This will cause slipping, heat, and premature clutch failure.
A twin disc clutch has a flywheel, a friction disc, an intermediate metal plate, pinned to the flywheel, another friction disc and the pressure plate. When you stack them all up under pressure, they can take a lot more power transfer. Some people take a while to get used to the clutch action, as a twin disc set up tends to "hook up" with greater intensity.
The other issue is that with all this power engaging like right now you add stress to the gear box and other drive line components. I would say the weakest links are the CV joints in the half shafts. With a hard start in first gear on sticky tires, you could be applying over +3000 Ft/Lbs of torque to the axles. And, they will fail.
So be kind to your drive train and go easy on first gear launches, unless you are drag racing. Then I recommend the FP HD axles and a center differential bracing kit. Shift well my friends.
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post #2 of 9 (permalink) Old 04-25-2019, 10:13 AM Thread Starter
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But wait, there's more. Here's the type of racing clutch we used on the Trans Am cars. They are quite small, About 6" and expensive, and the engage like a switch.
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post #3 of 9 (permalink) Old 04-25-2019, 10:11 PM Thread Starter
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Here's the good axle shafts. Supposed to be good up to 1500 HP? But differential won't be without serious mods. Bad news is that they are $2400 a pair. Look for thread under differential braces for diff. brackets.
Thanks for the likes guys, appreciate it.
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post #4 of 9 (permalink) Old 04-26-2019, 01:43 PM Thread Starter
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And, the icing on the cake, a FP 4:09 gearset to offset that lazy gearbox.
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post #5 of 9 (permalink) Old 04-26-2019, 09:18 PM Thread Starter
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final repost


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post #6 of 9 (permalink) Old 05-14-2019, 10:11 PM

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If I remember those are GT350 axles and really only 1 is actually different from the GT axle. I forget what side. So some people just swap 1 axle out.

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post #7 of 9 (permalink) Old 05-14-2019, 10:41 PM Thread Starter
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The difference is the hardened CV joints and higher grade of steel axles. Probably the ones on the GT 350.


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post #8 of 9 (permalink) Old 05-14-2019, 10:43 PM
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Good write up...many thanks. Very educational. Doesn't really apply to my driving, but I've been curious about the multi disc clutches.
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post #9 of 9 (permalink) Old 05-15-2019, 02:01 PM

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The Mcleod RST twin disc is very easy to drive on the street. It has organic base clutch plates that make this clutch hold up to 800 hp and it works great for everyday driving. I installed this in my 2001 Bullitt and it has a much softer pedal (even with the cable and clutch fork) and hooks up very well when needed. My Bullitt only puts down 431 to the rear wheels and this was still a great upgrade for my car. If you can spend the extra for a great all around clutch I would highly recommend this clutch.
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