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Post  John Myrick on February 16th 2013, 3:09 pm

I have a Peterson Mandrel that I'm trying to install. The spacer is .5" thick but, the balancer bolt is protruding out a total of 1.25" from the face of the balancer. Does Peterson make a 1.25" spacer or is there something I'm missing ?
The mandrel bolts straight to the balancer without the aid of the balancer bolt from what I gather.

Thanks for any help.

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Post  c.evans on February 16th 2013, 4:11 pm

Look at the back side of the mandrel. There is generally a counterbored "recess" in the back of the mandrels. Measure and see how deep it is. Then make an informed decision from there.

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Post  John Myrick on February 16th 2013, 4:21 pm

The back side of the mandrel has a male register that is suppose to fit inside the spacer. It's not counterbored.
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Post  c.evans on February 16th 2013, 6:20 pm

John, I do not know whether Petersen makes a 1.250" spacer or not. Maybe you can go to their web-site and look it up. If not, then buy two more spacers and stack the three of them up. Or, take your 1/2" thick spacer to your local machine shop and have them make one that has the same dimensions, except make it thicker.


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Post  Lem Evans on February 16th 2013, 6:26 pm

I suspect buying one thick spacer will be a lot cheaper than buying three thin ones.

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Post  John Myrick on February 16th 2013, 6:29 pm

I sent a email to Patterson, so we shall see what they say.

Thanks
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Post  cool40 on February 16th 2013, 8:26 pm

Can you not put the big bolt through the center and use it in place of the thick washer?
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Post  John Myrick on February 16th 2013, 8:38 pm

cool40 wrote:Can you not put the big bolt through the center and use it in place of the thick washer?

If your talking about sending the bolt all the way through the entire mandrel assembly then no that won't work or rather I wouldn't feel comfortable using it. The peterson unit bolts to the balancer and then uses spline stack adapters to elongate the mandrel unlike others that just use a longer and longer bolt to elongate the mandrel for more pulleys.
I was hoping the balancer had a shoulder inside the hub that I could use a smaller washer but, the hub is the same diameter all the way through.
I'm sure Peterson has seen this problem before and will have a remedy very quickly. If not, i will have a spacer machined that is 1.250" thick.
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Post  racnrick on February 16th 2013, 9:49 pm

If you bought an Inovators balancer from Lem you wouldn't have that snout to deal with, I believe some other aftermarket balancers are flat on the front too. cheers

[img]Mandrel Advise Needed 1f100_3399_zps6cd5152d[/img]

[img]Mandrel Advise Needed 1f100_3398_zps31c3f8a8[/img]

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Post  David Cole on February 16th 2013, 10:36 pm

That looks like it's meant for a sbf. Peterson's site doesn't list either bbf or sbf, but another site listed it as S Ford.

SBF dampers have a place for that center register to go.

Some BBF dampers that are meant for a short Boss style crank snout also have a place to register. My ATI bbf damoer for a short snout uses a sbf hub. Peterson DOES list that part as being for an ATI damper.

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Post  cool40 on February 16th 2013, 11:37 pm

i dont know what your driving with it but mine works fine with one bolt.it pulls the vac and fuel pumps. Mandrel Advise Needed 68_01510
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Post  richter69 on February 17th 2013, 12:05 am

I drove the same inj, an oil pump, and a vac pump with the centerbolt only, mandrel was stepped to rest against the end of the crank as well as the balancer hub, and keyed to the balancer.
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Post  Lem Evans on February 17th 2013, 12:05 pm

I suspect that John has the spacer that fits the I.W. damper that has the bbc 3 bolt pattern.....the one for the 'boss' style snout.

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Post  Lem Evans on February 17th 2013, 12:08 pm

racnrick wrote:If you bought an Inovators balancer from Lem you wouldn't have that snout to deal with, I believe some other aftermarket balancers are flat on the front too. cheers

[img]Mandrel Advise Needed 1f100_3399_zps6cd5152d[/img]

[img]Mandrel Advise Needed 1f100_3398_zps31c3f8a8[/img]

The 4 bolt I.W. dampers for the stock lenght snout are male in the center... like the production dampers.

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Post  nitro717 on February 18th 2013, 2:27 pm

If you cannt get yours to work this one will, I had the exact same issues and this one worked perfect.
http://shop.aerospacecomponents.com/mandreldrivesystem1.aspx
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Post  Barney on February 18th 2013, 4:20 pm

I also use the Aerospace unit. Works great.
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Post  dirt_worker on August 21st 2013, 11:18 am

Any update on the remedy?
I'm looking for a mandrel to drive my vacuum pump and alternator. I have a FRPP balancer just like john has. Will the aerospace unit in the provided link fit?
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Post  JohnSwenson on March 24th 2015, 8:57 pm

John,
How did you get a mandrel installed on your ATI?  I have the same problem with a new ATI balancer. Does anyone make a spacer 1.25 inches thick?

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Post  BOSS 429 on March 24th 2015, 10:19 pm

John Myrick wrote:I have a Peterson Mandrel that I'm trying to install. The spacer is .5" thick but, the balancer bolt is protruding out a total of 1.25" from the face of the balancer. Does Peterson make a 1.25" spacer or is there something I'm missing ?
The mandrel bolts straight to the balancer without the aid of the balancer bolt from what I gather.

Thanks for any help.

Mandrel Advise Needed IMAG0320_zps47728a27

Mandrel Advise Needed IMAG0321_zps075af9c3



you have the wrong one,that one is for the crank trigger with a short boss lenght crank, you need the other one they now sell that I came up with for them, feel free to call me as this is a common problem with the bbf

tell them you want the one that Rich from CIRCLE R designed
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Post  John Myrick on March 25th 2015, 7:56 pm

It has worked itself out and I will post pics tomorrow.
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Post  dirt_worker on March 26th 2015, 12:35 am

Heres how I did mine using the FRPP balancer.
Mandrel Advise Needed 20140927_133521-1_zpsovqjyopi
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Post  JohnSwenson on March 26th 2015, 9:40 am

Thanks, that spacer is exactly what I needed. ATI should add that as part of an installation kit to every BBF balancer they sell.
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Post  10SHOTS on February 11th 2016, 9:22 pm

richter69 wrote:I drove the same inj, an oil pump, and a vac pump with the centerbolt only, mandrel was stepped to rest against the end of the crank as well as the balancer hub, and keyed to the balancer.

was this a mandrel from GZ Motorsports ?
thanks
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