Mandrel Advise Needed

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.

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.

Charlie

The back side of the mandrel has a male register that is suppose to fit inside the spacer. It's not counterbored.

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.

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

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

Thanks

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

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.

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.

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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.

Welcome to the world of custom parts.

i dont know what your driving with it but mine works fine with one bolt.it pulls the vac and fuel pumps.

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.

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.

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.

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

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

I also use the Aerospace unit. Works great.

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?

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?

John Swenson

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.

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

It has worked itself out and I will post pics tomorrow.

Heres how I did mine using the FRPP balancer.

Thanks, that spacer is exactly what I needed. ATI should add that as part of an installation kit to every BBF balancer they sell.

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