Coming Through With the Clutch

"FastIndy" (FastIndy) 06/26/2015 at 09:15 • Filed to: COSWORTH, SD4, FIERO, PONTIAC, DOHC

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Finally got it in! Been looking for one I could afford for a while, so when this popped up on eBay for $800 I jumped on it:

It’ll be accompanying my DOHC 2.6L Pontiac Super Duty 4cyl:

And going in this:

One step closer!

pip bip - choose Corrour > FastIndy 06/26/2015 at 09:23

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how much normally?

crowmolly > FastIndy 06/26/2015 at 09:26

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Everything about this post is amazing. Please continue to post about this build! SD4!!

LongbowMkII > FastIndy 06/26/2015 at 09:37

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A quick google to figure out what exactly a Pontiac super duty is revealed your build thread:

race motor in a street car? I can dig it. (also explains the beefy expensive clutch for a GM I4)

Luc - The Acadian Oppo > FastIndy 06/26/2015 at 09:37

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I never replace a clutch in anything. Lets just say I’m surprised with just how small it actually is. I always thought it would be bigger than that even in a 4 cyl.

Connqr > FastIndy 06/26/2015 at 09:40

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So, what exotic will it be? Countach? 458? McLaren f1?

desertdog5051 > FastIndy 06/26/2015 at 09:46

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I have been told that small diameter clutches are not well suited for street use. Can you explain your choice for your car?

DoYouEvenShift > FastIndy 06/26/2015 at 09:51

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Awww that thing is tiny!! Cool car though, that cylinder head looks killer.

Good luck on the build.

FastIndy > desertdog5051 06/26/2015 at 10:17

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Street use will probably be fairly limited. Cosworth’s build specs suggest a minimum 3000RPM idle speed! I’m hoping with a stronger timing chain and some improvements to the original valve train, I can hit 10,000RPM. But the main goal was reducing the moment of inertia as much as possible, it should be somewhere around 70-80% less than a typical oversquare V8.

Carbon clutches are usually also more easily modulated than the metallic plates as used in NASCAR, and can take WAY more heat, which improves the drivability.

FastIndy > pip bip - choose Corrour 06/26/2015 at 10:17

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$4000+, usually!

FastIndy > crowmolly 06/26/2015 at 10:51

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Thanks! It’s a slow build but I’m regaining some momentum on it now. I’ll keep updating on Oppo =)

nlzmo400r > FastIndy 06/26/2015 at 11:38

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Wicked project. But 10k rpm with 2.7l inline 4cyl? I has doubts.

FastIndy > Connqr 06/26/2015 at 14:17

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The most exotic of all...A GM MR two-seater =)

Connqr > FastIndy 06/26/2015 at 14:22

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What??? Impossible.