Crank Pinning
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Pro
Joined: Jul 2006
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From: Punta Gorda FL A Man's got to know his limitations!
Crank Pinning
Putting a Vortech Supercharger on my 02 Coupe and looking for any information or photos on how and where the pin should be located. Any help on how much and where a kit can be obtained would be great. Do I need to do this on a Stock Engine? Thanks.
Le Mans Master
Joined: Feb 2000
Posts: 7,032
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From: Newburgh NY
Yes, you need to do it. Should have come with the kit. Available from most tuner shops. (Note - see previous posts about balancer spinning off!).
You have to either remove the Steering Rack or disconnect it and pry it up enough out of the way to get to the balancer bolt. Stock bolt will require either a kick-azz impact or long breaker bar to get out.
After drilling, use a new bolt (comes with kit). Torque to 37 ft/lbs and then turn another 140 degrees (mark the bolt head with a sharpie to keep track). Also require a long breaker bar. Alternately you can put some locktight on it and whack it with a real powerful impact wrench.
Helps to lock the flywheel up while doing it. I use a GM tool that bolts in place of the starter. Whatever works for you.
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From: Punta Gorda FL A Man's got to know his limitations!
Thanks for the info Joe!
Just to make sure If I got the right idea. Any other suggestions are greatly appreciated as I am new to this type of Mod and don't want to SCREW it up.
I'm guessing buy the pics and description that the main crank/dampner bolt is put on initially at 37 tf/lbs and then turned an additional 3/8 of a full turn. Then you would drill the 1/4in. hole through the crankbolt washer and into the crank itself? Also what type of drill bit will I need to buy? It seems that this is some pretty hard metal and would require one hell of a drill bit.
Thanks to all!!
Just to make sure If I got the right idea. Any other suggestions are greatly appreciated as I am new to this type of Mod and don't want to SCREW it up.
I'm guessing buy the pics and description that the main crank/dampner bolt is put on initially at 37 tf/lbs and then turned an additional 3/8 of a full turn. Then you would drill the 1/4in. hole through the crankbolt washer and into the crank itself? Also what type of drill bit will I need to buy? It seems that this is some pretty hard metal and would require one hell of a drill bit.
Thanks to all!!
Team Owner
Joined: May 2005
Posts: 23,682
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From: Flagstaff Az.
pinning
I would not drill the crank washer- let it go over the pin to make sure it doesn't back out. The material is not hardened so a good bit will suffuce. I would also read some of the posts about using longer bolt to get the pulley started and pulled in a ways. There have been some stories about stripped bolts-crank snouts. Make sure no debris from drilling gets into crank snout. Good luck with the project.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
There is a crank pinning tool that you should use as a guide to make sure you drill the hole 1/2 in the pulley and 1/2 in the crank. You do not need a specail drill bit for the metal. The bolt/washer go over the pin you insert. Make sure the hole is drilled just deep enough so the pin does not stick out when you put it in.
I used red lock tight and a big impact driver to torque mine down.
I used red lock tight and a big impact driver to torque mine down.
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Pro
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From: Punta Gorda FL A Man's got to know his limitations!
Thanks for all the info. Do you recommend upgrading the dampner or is the stock one fine. I'd rather leave it on and not have to take it off. I would imagine that balancing would not be an issue at this point of the game.
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Race Director
Joined: Oct 2002
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Originally Posted by indy300
Excuse my ignorance...but what does the pinning accomplish? Why do you do it while supercharging?
On a n/a application, this is ok, as all the pulley does is drive the a/c, alternator, water pump, and power steering.
Bolting on a supercharger adds considerable load to the crank pulley. The higher the boost, the more power it takes to spin the blower.
If left as-is, the crank pulley is known to spin on the crankshaft. So, drilling and pinning it adds a measure to prevent this pulley from spinning on the crankshaft.
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Pro
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From: Punta Gorda FL A Man's got to know his limitations!
Got It. Excuse my ignorance. I'm used to working on the old F-Bodies when pulleys were bolted on and balancers were keyed. What was Chevy thinking?
Drifting
Joined: Oct 2004
Posts: 1,597
Likes: 1
From: Columbus, OH
Originally Posted by Y2Kvert4me
Stock, the crank pulley is only held on the shaft by a press fit. There is no keyway or anything other than the intereference fit to keep it from spinning on the crank.
On a n/a application, this is ok, as all the pulley does is drive the a/c, alternator, water pump, and power steering.
Bolting on a supercharger adds considerable load to the crank pulley. The higher the boost, the more power it takes to spin the blower.
If left as-is, the crank pulley is known to spin on the crankshaft. So, drilling and pinning it adds a measure to prevent this pulley from spinning on the crankshaft.
On a n/a application, this is ok, as all the pulley does is drive the a/c, alternator, water pump, and power steering.
Bolting on a supercharger adds considerable load to the crank pulley. The higher the boost, the more power it takes to spin the blower.
If left as-is, the crank pulley is known to spin on the crankshaft. So, drilling and pinning it adds a measure to prevent this pulley from spinning on the crankshaft.
