SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: aquaholic72 on April 03, 2015, 01:41:07 AM

Title: Bronze dist gears
Post by: aquaholic72 on April 03, 2015, 01:41:07 AM

So i know that if u run a roller cam ur supposed to run a bronze distributor gear says everyone. I always have cuz thats what we're supposed to do. But im goin thru my buddies 502 right now cuz it hucked a rod bearing and it has a roller in it with about 8000 miles on the motor. And a regular steel gear on the distributor ... i noticed that pretty quick and started lookin at the cam gear and dist gear and it all looks fine. No harm no foul.. so why exactly is the bronze gear such a big deal for roller application? I just bought a new dist for my boat and the box has abig sticker on it that says for rolller u must use bronze gear.... not sure im really convinced as to why anymore...

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Title: Re: Bronze dist gears
Post by: mash on it on April 03, 2015, 07:07:03 AM

If its a GM roller cam, use a melonized iron gear.

from GM:
"Note 2: Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts."

If its a billet roller cam, use the bronze or composite gear.
Some roller cams can be ordered with a cast iron gear, and use a regular dizzy gear for a flat tappet cam (Howards cams can be ordered that way)

I've seen a GM roller and a cast iron gear together, It sharpened the teeth within a few hundred miles.

Find out what / who's cam it is.

Dan'l

Title: Re: Bronze dist gears
Post by: aquaholic72 on April 03, 2015, 03:04:03 PM

Cant find any brand id's on the cam. Just 2 groups of #'s engraved on the end.. E266HR12 and GA5574.. no part # on the dist gear..

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Title: Re: Bronze dist gears
Post by: GT Jets on April 03, 2015, 03:42:49 PM

Quote from: aquaholic72 on April 03, 2015, 03:04:03 PM

Cant find any brand id's on the cam. Just 2 groups of #'s engraved on the end.. E266HR12 and GA5574.. no part # on the dist gear..

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Shine a flashlight down the distributor hole. If you see shiny gears, you need a bronze drive gear. If black, steel is ok.

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Title: Re: Bronze dist gears
Post by: aquaholic72 on April 03, 2015, 03:45:35 PM

Cams out

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Title: Re: Bronze dist gears
Post by: GT Jets on April 03, 2015, 03:48:10 PM

Quote from: aquaholic72 on April 03, 2015, 03:45:35 PM

Cams out

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You should be able to use an iron gear.

Check this out.

http://www.chevyhardcore.com/tech-stories/ignition-electronics-efi/selecting-the-correct-distributor-gear-its-all-about-the-details/

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Title: Re: Bronze dist gears
Post by: aquaholic72 on April 03, 2015, 05:16:31 PM

Cool... thanks for all the info..

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