What did you do to your supra today? Pics

[zonian91]

This is an OBX Racing crank pulley and it has a slot for the Woodruff key and I got a new one too.

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[zonian91]

Here are the pulleys side by side.

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[zonian91]

Even with a brand new balanced crank, new Clevite racing bearings, new ARP rod bolts?

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[Backlash2032]

Yes.

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[Grandavi]

Especially with... lol. Its all about physics

 

[zonian91]

I understand basic physics, but I still can't see how the crank will be out of balance with everything holding it in place.

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[Backlash2032]

It's not the crank being out of balance. It's the explosions that are forcing it to spin that cause the inherent vibrations.

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[zonian91]

Wrong pick.

https://vimeo.com/136012560

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[A-to-the-J]

Why is everyone saying this? This motor has been rebuilt from the crank up and it weighs a ton! How is 7 1/2 lbs going to make a difference in the balance of the motor?

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Read please. People are telling you it's bad for a reason. If you don't want to listen, read the thread

http://www.supramania.com/forums/sh...iftmotion-underdrive-crank-pulley-good-to-use

It doesn't matter how buttery the crank turns. But you're welcome to put it on. I'm not bashing, just throwing out some info when I was hell bent on getting one.

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[Grandavi]

Basically you have to think "harmonic" (harmony... Music is vibration) "dampener". It absorbs vibration so the crank doesn't self destruct. Unless you understand mechanical engineering very well, go with the proven solution. Alter at your own peril.

Just read the link above... Excellent material.

 

[zonian91]

Thanks. Now I just wasted $90!

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[Backlash2032]

It could be worse ya know...😉

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[zonian91]

Trust me I know. I built, what I thought would be a bad ass 5th Generation Prelude and the machine shop I USED TO use to put the motor together, did something wrong, because the motor became oil starved, so it started knocking, so I got rid of it and stopped the bleeding.
The car ran like a champ, until it started knocking.

 

[#04]

Oh yeah, mine had the slot, but t shop that sold m my lathed tensioner pully said, "all aluminum, I have seen the crank rip the key through the pulley " so he was referring to a steel sleeve insert t reinforce the pulley.

I'll be going fluidyne, next tim I drop some supra monies

This is an OBX Racing crank pulley and it has a slot for the Woodruff key and I got a new one too.

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[zonian91]

Ok, I think I understand what you're trying to say, but where will the sleeve go around the pulley.

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[#04]

The sleeve will go on the very inside, to reinforce the area the woodruf key transfers energy to

Most designs do not incorporate this steel (ring basically) into the aluminum.

 

[#04]

http://www.evoxforums.com/forums/showthread.php?t=50463

 

[zonian91]

Thanks, but I see why that cheap ass regular aluminum crank pulley failed. Mine is made out of aircraft billet aluminum and I'm only going to have about 250 hp at the crank, not 600 + hp! Jesus, you need heavy duty parts when you're pulling that many horses!


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[GC89]

Thanks, but I see why that cheap ass regular aluminum crank pulley failed. Mine is made out of aircraft billet aluminum and I'm only going to have about 250 hp at the crank, not 600 + hp! Jesus, you need heavy duty parts when you're pulling that many horses!


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Just go ahead and run it............................Report pics and post back when you do the tear down.

 

[zonian91]

I can sense your obious sarcasm, by the way. I do appreciate all the advise. I just will hate to use that old ass rusty looking, heavy ass harmonic balancer! Why would these companies sell you a product that will cause catastrophic failure? I don't get that.

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