Flat 4 bolt crank pulley

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Flat 4 bolt crank pulley Empty Flat 4 bolt crank pulley

Post  soupbean on January 25th 2013, 5:51 pm

I am having a hard time finding a flat single groove 4 bolt crank pulley. Anybody have any leads? Thanks
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Post  Wheelie58 on January 25th 2013, 7:08 pm

I guess Jones was no dice?
See if you can find one that is the correct OD, but wrong in the middle.
We can make one....
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Post  QtrWarrior on January 25th 2013, 7:29 pm

I have taken a chevy 3 bolt pulley and re-drilled it in a 4 bolt pattern before..
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Post  soupbean on January 25th 2013, 7:31 pm

Looking like that's what it is going to be. FE 3 bolt and machine to 4 bolt I guess...
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Post  soupbean on January 25th 2013, 7:33 pm

QtrWarrior wrote:I have taken a chevy 3 bolt pulley and re-drilled it in a 4 bolt pattern before..

Right center diameter?
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Post  QtrWarrior on January 25th 2013, 7:41 pm

soupbean wrote:
QtrWarrior wrote:I have taken a chevy 3 bolt pulley and re-drilled it in a 4 bolt pattern before..

Right center diameter?

Nope, had to bore it to size..
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Post  soupbean on January 25th 2013, 8:12 pm

QtrWarrior wrote:
soupbean wrote:
QtrWarrior wrote:I have taken a chevy 3 bolt pulley and re-drilled it in a 4 bolt pattern before..

Right center diameter?

Nope, had to bore it to size..

10/4. Thanks.
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Post  soupbean on January 25th 2013, 8:13 pm

Wheelie58 wrote:I guess Jones was no dice?
See if you can find one that is the correct OD, but wrong in the middle.
We can make one....

This has to be a common need. I can't believe no one makes it. Might be a good addition to your product line. Very Happy
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Post  Wheelie58 on January 25th 2013, 8:20 pm

soupbean wrote:
Wheelie58 wrote:I guess Jones was no dice?
See if you can find one that is the correct OD, but wrong in the middle.
We can make one....

This has to be a common need. I can't believe no one makes it. Might be a good addition to your product line. Very Happy
Yeah....I have made a couple out of Chevy pulleys.
If it goes on the front of the crank trigger wheel, I make a little center register to snap in to the recessed hole in the wheel.
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Post  DILLIGASDAVE on January 25th 2013, 9:23 pm

What about drilling out the spotwelds on a later model pulley & pulling the stack apart? Isn't the pulley on the back of the stack a flat one on some years?
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Post  bruno on January 25th 2013, 9:37 pm

can you post a pic of what you are looking for study

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Post  soupbean on January 25th 2013, 9:51 pm

bruno wrote:can you post a pic of what you are looking for study

http://www.429-460.com/t13307p75-vacuum-pump#170971

Like Doug's where I posted on page 6. His was a custom made deal and he gave me contact info but it would be 4 weeks out. Trying to come up with something next week.
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Post  Lem Evans on January 25th 2013, 10:10 pm

Flat 4 bolt crank pulley Doug2stage0022Small_zps092447f1


Doug Rahn's deal.

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Post  Wheelie58 on January 25th 2013, 10:11 pm

I emailed a pic to you...
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Post  soupbean on January 25th 2013, 10:20 pm

Lem Evans wrote:Flat 4 bolt crank pulley Doug2stage0022Small_zps092447f1


Doug Rahn's deal.

Yep. That one.
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Post  DanH on January 26th 2013, 5:04 am

CV products , run pump drives and can drive a V belt .

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Post  soupbean on February 11th 2013, 10:05 pm

For those that run into this, I had NO luck finding someone who stocks a flat 4 bolt BBF pulley. In the end I bought a flat BBC pulley and had the hub bored and holes drilled to the BBF 4 bolt pattern thanks to Keith Fulp of KFM Motorsports. I also used one of Keith's 1/4" crank pulley spacers to align with the location I mounted the alternator. This will also allow for future installation of a crank trigger wheel if I decide to do so...

Flat 4 bolt crank pulley Pulley_zpsfdf61d68
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Post  Wheelie58 on February 12th 2013, 12:30 am

I don't know . That pulley looks an awful lot like a KFM Flying Toilet restrictor plate to me.
Glad it fit...always happy to help.
Thanks
Keith
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Post  kim on February 12th 2013, 8:09 am

soupbean wrote:For those that run into this, I had NO luck finding someone who stocks a flat 4 bolt BBF pulley. In the end I bought a flat BBC pulley and had the hub bored and holes drilled to the BBF 4 bolt pattern thanks to Keith Fulp of KFM Motorsports. I also used one of Keith's 1/4" crank pulley spacers to align with the location I mounted the alternator. This will also allow for future installation of a crank trigger wheel if I decide to do so...

Flat 4 bolt crank pulley Pulley_zpsfdf61d68

Not to be a pooper of parties, but I've been there and done that.

Used a chevy flat pully about 4.5" across, to a stock alternator pully. On the dyno run with the first hard pull to about 9000 RPM, the belts shot off and with the gimler belt driving the fuel pump, off, of course the engine shut down. Walked into the dyno room, and had this high pitched whinning sound, looking around, couldn't figure out for the life of me what the F was whinning, till I saw the alternator still spooling down.

With the multiplication of the larger crank pully and the small alternator pully as used on street oriented cars not intended to see above about 3500 RPM, we figure we got the old alternator up around 20,000 RPM.... don't think I'de ever need that much alternator output.

If your engine is going to see any RPM. id suggest at most, a pully ratio 1-1 but most likly want to get that crank pully way smaller, and that alternator pully way larger to start an RPM reduction.

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Post  QtrWarrior on February 12th 2013, 9:32 am

X3. Done it too...
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Post  jasonf on February 12th 2013, 9:03 pm

So where did you end up buying that pulley from?
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Post  kim on February 12th 2013, 9:12 pm

I ended up making one, put the spacer for the gimler drive right into the pully.

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Post  QtrWarrior on February 12th 2013, 9:18 pm

jasonf wrote:So where did you end up buying that pulley from?

I bought mine from Jeg's, before I modified it..
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Post  soupbean on February 12th 2013, 9:56 pm

jasonf wrote:So where did you end up buying that pulley from?

$25 summit deal here
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