II need a longer Pitman arm; is a comparison chart out there?

[Ziffer]

I looked at VanPelts and got a good diagram for different length clutch arms but nothing for pitman arms. I am looking for the longest arm that will fit a F1 steering box. Does anyone have a comaprison chart or something similar?

Thanks
Z

[john in illinois]

Bruce Lancaster gave some charts for pitman arm length on HAMB.


http://www.jalopyjournal.com/forum/t...ptions.222723/
John

[skidmarks]

What are you trying to use the box in? For a model A most use a 37 to 48 pitman arm.

[scooder]

Are you also aware that the longer the Pittman arm the harder (but faster) the steering is?
Martin.

[russcc]

The green bible lists them. What you want to keep in mind, is what Scooder touched on briefly. You want a ratio of somewhere between 0.85:1 to 0.96:1 for reasonable steering effort, and speed for the right road feel, Example; Divide a 6.00" pitman arm, by a 6.250" steering arm, (the effective length from the drag link connection to the wheel tire centerline. The ratio of that example is 0.96:1. After you measure the effective length of the steering arm, you can determine the right length pitman arm you need, and post that dimension on the Barn, and someone will tell you which one you need.

[Ziffer]

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Thanks for the information. I will calculate my current ratio and plan accordingly for my longer pitman arm and if needed make a new steering arm.

Thanks
Z

[russcc]

A lot of the EV8 arms fit the F1 steering box, I believe I have '36 arm on my F1 in the roadster.

[Andy]

All of the V8 arms are about the same length.The Model A arms are longer but have the square shaft, You could weld an A arm to a V8 hub. The A is about 2" longer. Pic is of V8 arms. 37-48.

[JSeery]

Question, what is the reason you need a longer arm?

[V8COOPMAN]

Originally Posted by Andy

All of the V8 arms are about the same length. Pic is of V8 arms. 37-48.

I'd venture to say that the one on the left is probably '35-'36, as I've found them to be a little shorter than the '37-'48s. DD

[russcc]

I had a '41 Ford pickup arm on my F1 steering box in the roadster that was too long to get the ratio I wanted, so I changed it out to a 'shorter '36 I believe. If I can find the '41 I will measure it and the '36, and post.

[Andy]

Coop.I believe you are right. It is an old pic.

[Ziffer]

problem is the tire is hitting the drag link between the pitman and steering arms on a left turn. I have almost 0.5 inch to go to hit the stop nut.

[Mart]

I used a lug nut as an extended stop nut. A little lathe work and it looks ok. You might be 1/2" off the stop, but your turning is limited by drag link placement. Unless you redesign your steering to turn sharper without fouling, you have to modify the stop to suit the available turning angle.

Mart.