Crank Pulley Hole Dimensions

[gibbsr1]

Anybody happen to have a print of the damper on a r series engine. I need to make a pulley, and I believe one hole is offset to insure orientation.

Dan Giblin
Cincinnati, OH

[rockne10]

Why not buy another pulley?

[gibbsr1]

I am mounting a Vortech supercharger and they don't make a pulley for a stude. I have a pulley that will work but I want to make sure I have the bolt pattern exact before I drill it.

Dan Giblin
Cincinnati, OH

[Studeman]

quote:Originally posted by gibbsr1

I am mounting a Vortech supercharger and they don't make a pulley for a stude. I have a pulley that will work but I want to make sure I have the bolt pattern exact before I drill it.

Dan Giblin
Cincinnati, OH

Why don't you just use an original reinforcement plate, or original crankshaft belt pulley as a template? Center it and bolt it to your "new" pulley, then drill the holes?


Specializing in Studebaker Restoration

[gibbsr1]

I'd like to indicate it in on a mill so it will be exactly centered and run as true as possible and then drill the holes. I do have a plate like you said and I may end up doing it somewhat like that but I'd be willing to bet someone out there has the exact dimensions I'm looking for.

Dan Giblin
Cincinnati, OH

[N8N]

I thought that it was posted here before, do a search for it...

edit: found it, this is what I was thinking of

http://forum.studebakerdriversclub.c...s=bolt,pattern

so never mind, unless it is the same as the flywheel bolt pattern (anyone know? I doubt it, as the bolts themselves are smaller IIRC)

nate

--
55 Commander Starlight
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[studeski]

What Ray said. You're making this much too difficult.

Claude Chmielewski
Studeski
http://www.studeski.com
Fillmore, Wisconsin
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[64Avanti]

I posted that other bolt pattern for the flywheel. The best way to make sure the pulley runs straight is to have a pilot on it that fits into the damper, then the holes can be oversize and have no impact on pulley runout. I will post the bolt pattern in a day or so.

David L

[gibbsr1]

David, I agree with the pilot but the pulley I have doesn't have an offset in it to allow a machined in pilot. That would be great if you could post a print. I developed a hole pattern on a bridgeport with a direct readout and a .316 drill blank. However, I'd like like to check it against your print just to be sure. Maybe I can ream 2 of the holes and use shoulder bolts to allign it.

Dan Giblin
Cincinnati, OH

[64Avanti]

OK here is a sketch of the pulley bolt pattern from the pulley interface side NOT THE DAMPER pattern. The damper pattern is the same but with the 65 and 55 degree measurements reversed.


I can't get to my drawings of the pulley right now but I measured one of the R3 pulleys. This should be accurate. If you have X,Y corrdinates you can just use some Trig to see if your hole pattern matches. The only possible error would be the one offset hole could be off by 1 degree, but I don't think it is. With the clearance hole size it should be ok in any case. Since you have a pulley I would suggest that you make an adapter that pilots on the damper and the pulley. The below sketch shows the idea. I WOULD NOT attempt to use the bolt pattern to center to pulley to the damper.



Just machine a pilot hole on your pulley and then make the adapter to fit.


David L

[gibbsr1]

Thanks for the help....I'll definately make the adapter pilot. This should be one neat little 259!!

Dan Giblin
Cincinnati, OH

[64Avanti]

Which Vortech blower are you using?

David L

[gibbsr1]

It's a V-1. I just got the pulley done last night. Now time to figure out how to mount everyting. Thanks for prints, witout those I bet i would have had the hole offset the correct angel, but the wrong way.

Dan Giblin
Cincinnati, OH

[64Avanti]

Glad to help.

Post some pictures of what you are doing.

You can see some of my Bonneville race car over on the Studebaker racing forum.

http://racingstudebakers.com/stl-web...pic.php?t=1297

David L

[Eddie]

Thanks for the sketches.

Just an idea...armed with that bolt pattern, an enterprising fellow could make the coupling hub for a front drive mandrel.

Eddie

"No matter where you are...there you are"
Dr. Buckaroo Bonzai