distributor gears and cam cores

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Walter R. Malik
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Re: distributor gears and cam cores

Post by Walter R. Malik » Thu Sep 20, 2018 8:52 am

cjperformance wrote:
Thu Sep 20, 2018 5:14 am
Walter R. Malik wrote:
Wed Sep 19, 2018 9:25 pm
Why do some people have a giant issue with even trying a "composite" distributor gear ...? :-k

It's not 1980 anymore.
Purely psychological Walter! I have to admit even though Im sure they are great that I have a mental boundry there, probably for no reason. I have to use ine in my own stuff before in a customer's engine just to 'feel' better about them.
Whats your experience with them? Cheers,
With every one I have ever used, if the press on the shaft is merely .0010" and they are kept lubricated, they work very well. They certainly wear a lot longer than bronze.

I think most people's problem is with their cost.
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Re: distributor gears and cam cores

Post by PRH » Thu Sep 20, 2018 9:21 am

I’ve used the composite gears in Chevies.

I’ve never seen any listed for a BB Mopar.

For one of my own motors(BBM), I’d experiment with chamfering the teeth on the cam gear to see if it helped diminish the wear.

On recent BBM builds using cams with sharp fat teeth I’ve seen the gears look noticeably worse after just a dyno session than what I saw after 300 passes and two dyno sessions with my 1994 vintage UD roller.
Somewhat handy with a die grinder.

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Re: distributor gears and cam cores

Post by Walter R. Malik » Thu Sep 20, 2018 9:52 am

PRH wrote:
Thu Sep 20, 2018 9:21 am
I’ve used the composite gears in Chevies.

I’ve never seen any listed for a BB Mopar.

For one of my own motors(BBM), I’d experiment with chamfering the teeth on the cam gear to see if it helped diminish the wear.

On recent BBM builds using cams with sharp fat teeth I’ve seen the gears look noticeably worse after just a dyno session than what I saw after 300 passes and two dyno sessions with my 1994 vintage UD roller.
I have used the composite gear for a MOPAR engine from "Tritec Motorsports" ... they ARE available.

I mentioned this earlier in this thread.
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Re: distributor gears and cam cores

Post by PRH » Thu Sep 20, 2018 11:38 am

Walter R. Malik wrote:
Sun Sep 09, 2018 9:51 am
jsgarage wrote:
Sun Sep 09, 2018 4:05 am
Something that doesn't seem to get much discussion are 'street roller cams' that are steel with a cast iron front journal & cam gear. The assembly is apparently indexed and pressed together, maybe with a woodruff guide key. Then you use a stock iron dizzy gear. I doubt if two-piece cams are strong enough to withstand the huge valve springs some racers think they need & 9500 rpms are likely not recommended, but for normal street/strip, it sure seems better than '1000-mile-bronze' gears that dump all that metal in the pan. We in the Cleveland family have been fighting this situation for decades as there never were factory steel roller cams & dizzy gears for that engine.
There are composite distributor gears for that engine and the big block Ford available from "Tritec Motorsports".
This is where I saw you mentioned Tritech.

I visited their site, they show one part number for a composite gear for a “Dodge”, doesn’t say if it’s a BB or SB.
Somewhat handy with a die grinder.

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Re: distributor gears and cam cores

Post by PRH » Thu Sep 20, 2018 2:30 pm

CamKing said:

Here's a partial list of some of the steels used by the cam core manufacturers: 1050, 1055, 1060, 4150, 5150, 5160, 8620, 8660, 9310.
Besides the different materials, there's different heat treat processes. Some are induction hardened, Some are Quench and Tempered, and some are Carborized. an Induction hardened 1055 cam core will work great with a Melonized gear. A Carborized 9310 cam core, will not.
Mike, which materials on the list would you say are compatible with the melonized gear, and which aren’t a good match?

With regards to the BBM roller cam cores and the finish/profile on the gear teeth...... do you find any core supplier has a better fit and finish in that area than the others?
Somewhat handy with a die grinder.

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Re: distributor gears and cam cores

Post by Walter R. Malik » Thu Sep 20, 2018 5:38 pm

PRH wrote:
Thu Sep 20, 2018 11:38 am
Walter R. Malik wrote:
Sun Sep 09, 2018 9:51 am
jsgarage wrote:
Sun Sep 09, 2018 4:05 am
Something that doesn't seem to get much discussion are 'street roller cams' that are steel with a cast iron front journal & cam gear. The assembly is apparently indexed and pressed together, maybe with a woodruff guide key. Then you use a stock iron dizzy gear. I doubt if two-piece cams are strong enough to withstand the huge valve springs some racers think they need & 9500 rpms are likely not recommended, but for normal street/strip, it sure seems better than '1000-mile-bronze' gears that dump all that metal in the pan. We in the Cleveland family have been fighting this situation for decades as there never were factory steel roller cams & dizzy gears for that engine.
There are composite distributor gears for that engine and the big block Ford available from "Tritec Motorsports".
This is where I saw you mentioned Tritech.

I visited their site, they show one part number for a composite gear for a “Dodge”, doesn’t say if it’s a BB or SB.
Both use the same size gear ... simply oriented on the shaft and helixed differently.

Edit: Call 'em ...the website doesn't tell everything. What I got from them was for a 426 Hemi.
Last edited by Walter R. Malik on Thu Sep 20, 2018 6:00 pm, edited 5 times in total.
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Re: distributor gears and cam cores

Post by cjperformance » Thu Sep 20, 2018 5:39 pm

Walter R. Malik wrote:
Thu Sep 20, 2018 5:38 pm
PRH wrote:
Thu Sep 20, 2018 11:38 am
Walter R. Malik wrote:
Sun Sep 09, 2018 9:51 am


There are composite distributor gears for that engine and the big block Ford available from "Tritec Motorsports".
This is where I saw you mentioned Tritech.

I visited their site, they show one part number for a composite gear for a “Dodge”, doesn’t say if it’s a BB or SB.
Both use the same gear ... simply oriented on the shaft differently.
Exactly !!
Craig.

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Re: distributor gears and cam cores

Post by Walter R. Malik » Thu Sep 20, 2018 6:10 pm

cjperformance wrote:
Thu Sep 20, 2018 5:39 pm
Walter R. Malik wrote:
Thu Sep 20, 2018 5:38 pm
PRH wrote:
Thu Sep 20, 2018 11:38 am


This is where I saw you mentioned Tritech.

I visited their site, they show one part number for a composite gear for a “Dodge”, doesn’t say if it’s a BB or SB.
Both use the same gear ... simply oriented on the shaft differently.
Exactly !!
Same size, not exactly the same ... I didn't express my full thought of what they are so, I added the words missing.

I think a 426 Hemi is considered a big block and is the same as a wedge ... #-o
Last edited by Walter R. Malik on Thu Sep 20, 2018 6:26 pm, edited 1 time in total.
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Re: distributor gears and cam cores

Post by cjperformance » Thu Sep 20, 2018 6:18 pm

Walter R. Malik wrote:
Thu Sep 20, 2018 6:10 pm
cjperformance wrote:
Thu Sep 20, 2018 5:39 pm
Walter R. Malik wrote:
Thu Sep 20, 2018 5:38 pm


Both use the same gear ... simply oriented on the shaft differently.
Exactly !!
Same size, not exactly the same ... I didn't express my full thought of what they are so, I added the words missing.
I know what you mean,,, my 'exactly' is regarding the 385bbf & clevo gear being interchangeable from a gear size point of view. As in if it says ok for bbf it can be used in a clevo, as can an entire dissy assy be swapped bbf to clevo and vise versa
Craig.

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Re: distributor gears and cam cores

Post by Walter R. Malik » Thu Sep 20, 2018 6:30 pm

cjperformance wrote:
Thu Sep 20, 2018 6:18 pm
Walter R. Malik wrote:
Thu Sep 20, 2018 6:10 pm
cjperformance wrote:
Thu Sep 20, 2018 5:39 pm


Exactly !!
Same size, not exactly the same ... I didn't express my full thought of what they are so, I added the words missing.
I know what you mean,,, my 'exactly' is regarding the 385bbf & clevo gear being interchangeable from a gear size point of view. As in if it says ok for bbf it can be used in a clevo, as can an entire dissy assy be swapped bbf to clevo and vise versa
YES ... Tritec also has those in composite. I don't think anyone else offers those.
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Re: distributor gears and cam cores

Post by cjperformance » Thu Sep 20, 2018 6:42 pm

Walter R. Malik wrote:
Thu Sep 20, 2018 6:30 pm
cjperformance wrote:
Thu Sep 20, 2018 6:18 pm
Walter R. Malik wrote:
Thu Sep 20, 2018 6:10 pm


Same size, not exactly the same ... I didn't express my full thought of what they are so, I added the words missing.
I know what you mean,,, my 'exactly' is regarding the 385bbf & clevo gear being interchangeable from a gear size point of view. As in if it says ok for bbf it can be used in a clevo, as can an entire dissy assy be swapped bbf to clevo and vise versa
YES ... Tritec also has those in composite. I don't think anyone else offers those.
Excellent thanks Walter
Craig.

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Re: distributor gears and cam cores

Post by BBO Omega » Wed Oct 31, 2018 7:30 am

Well I finally got around to replacing the original gear on my MSD distributor with the new gear I purchased directly from MSD. It had been in the package that they sent it in, and had developed a slight amount of surface rust. I cleaned this off in my parts cleaner with a brass cleaning brush. I then slid it on the shaft, and the fit is quite sloppy. It is going in the trash. The original (that is likely Melonized as well and would be fine to reuse) had a much more precise slip fit on the shaft. Mike Jones had recommended that I purchase a new gear from http://distributorgears.com/melonite-di ... ears/olds/, so I ordered one a week or so ago. Several week lead time, but at least they are made in the USA.
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Re: distributor gears and cam cores

Post by pamotorman » Wed Oct 31, 2018 9:00 am

on chevys I just file a shallow groove to get full pressure oil to the gears interface.
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Re: distributor gears and cam cores

Post by In-Tech » Wed Oct 31, 2018 1:20 pm

The groove is good, sometimes in laziness I just file a "flat" and orient that to the primary side of the cam gear.
Heat is energy, energy is horsepower...but you gotta control the heat.
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