Cam and distributor gear compatibility

[gzig5]

Now that I think of it, maybe it's just the tip of the Melling steel shaft that's hardened.

I just had one in my hands a couple weeks ago. Shaft is alloy, probably 4140 or something similar with a relatively high carbon content. Just the hex tip was hardened on mine. Looked like an inductive process where it's heated by a coil and quenched. May or may not need tempering on the end after that. The gear is a fine grain cast iron, probably like Dura Bar or other ductile iron.

 

[Bobzilla]

Melling IS-72 also come with the bronze bushing too. Pictures are in this thread below.
Oil Pump Driveshaft source

 

[Kern Dog]

Is there a down side to the bronze gear, I expect it to wear more quickly, but how long should it last? I went by Comp's recommendation and put the bronze gear but my cam isn't billet.

Cley

I was told that by 3000 miles, a customer of Dwayne Porter had to replace his Bronze gear.

 

[360duster]

Which is wrong? Please be specific. What is "this" in other words?

Sorry about being not precise in my answer. It was regarding the post before.....and about comp showing on their website that for this particular cam 20-813-9 the bronze cam gear #420 would be necessary. These cams are made from cast cores (used a few of them), so no need for the bronze gear.

Michael

 

[crackedback]

I was told that by 3000 miles, a customer of Dwayne Porter had to replace his Bronze gear.

Some of those in bad shape and run too long come out with razor edges on the teeth.

Regular gear works on the cam the OP asked about.