Distributor Gears

General engine tech -- Drag Racing to Circle Track

Moderator: Team

mag442
New Member
New Member
Posts: 10
Joined: Mon Oct 22, 2012 2:17 pm

Distributor Gears

Post by mag442 » Tue Oct 10, 2017 2:12 pm

I have a couple of BB Mopars that I service. These both have Billet roller camshafts in them. Both have Miloden bronze distributor gears. One engine has used 2 gears in 1500 miles. The other engine I can tell is wearing the gear as the ignition timing is retarded every time I check it when the car comes in. These are both street cars.
I have seen articles saying that you can use melonized gears on steel cams, and then also that you can't.
The other issue is that I am yet to see a melonized gear for a BB Mopar listed anywhere. My question is, can a melonized gear be successfully used in this application in a street car {if a melonized gear is available} If not, is there a better quality bronze gear.

Daniel Jones
Member
Member
Posts: 175
Joined: Wed Dec 21, 2011 4:09 pm

Re: Distributor Gears

Post by Daniel Jones » Tue Oct 10, 2017 2:35 pm

Crane makes a steel distributor gear (p/n 69970-1) for big block Mopars. We've used it on steel cams in Ford applications. However, Crane says not to use it on camshafts that have been run previously with a different material distributor gear. I suppose they are worried about the cam gear getting embedded with aluminum/bronze or iron. I wonder if you could polish the cam gear well enough to get rid of any embedded material?

Dan Jones

mark_follweiler
New Member
New Member
Posts: 45
Joined: Mon Aug 28, 2017 4:20 pm

Re: Distributor Gears

Post by mark_follweiler » Tue Oct 10, 2017 2:38 pm

talk to Chris Straub, Straub Technologies. fart smeller! :wink:

pamotorman
Guru
Guru
Posts: 2307
Joined: Thu Mar 06, 2014 11:55 pm

Re: Distributor Gears

Post by pamotorman » Tue Oct 10, 2017 5:46 pm

anyone ever tried to use a bronze gear hard chromed ?? on chevys I cut this groove in the housing to add pressurized oil to the gear interface
You do not have the required permissions to view the files attached to this post.

tresi
Member
Member
Posts: 168
Joined: Sun Mar 24, 2013 10:10 pm

Re: Distributor Gears

Post by tresi » Tue Oct 10, 2017 8:27 pm

Have you seen if anybody would make a cam with an iron gear pressed on for your app?

Walter R. Malik
Guru
Guru
Posts: 3415
Joined: Tue Jul 24, 2012 11:15 am
Location: Roseville, Michigan (just north of Detroit)
Contact:

Re: Distributor Gears

Post by Walter R. Malik » Tue Oct 10, 2017 8:35 pm

tresi wrote:
Tue Oct 10, 2017 8:27 pm
Have you seen if anybody would make a cam with an iron gear pressed on for your app?
The distributor gear is in the front on a big block mopar so, it would be difficult to remain a '
strong enough shaft for a roller application, to say the least.
A hydraulic roller with the less valve spring pressures ... maybe.
http://www.rmcompetition.com
Specialty engine building at its finest.

mag442
New Member
New Member
Posts: 10
Joined: Mon Oct 22, 2012 2:17 pm

Re: Distributor Gears

Post by mag442 » Tue Oct 10, 2017 11:25 pm

I found this on Hughes website,
http://www.hughesengines.com/Index/prod ... rtid=26734
They say they are OK on steel billet cams, but must be used on a new cam only.

cstraub
Guru
Guru
Posts: 1063
Joined: Wed Feb 18, 2004 5:30 pm
Location: Tri-Cities, TN
Contact:

Re: Distributor Gears

Post by cstraub » Wed Oct 11, 2017 10:32 am

Morel made MSD's distributor gears for 35 years. Morel has not made a gear for them in the last 3 years. All Morel gears made in the foreign country of Ohio by guys name Steve, Mike, Scott, and Ed.
Chris Straub
Performance Mfg.
http://www.straubtechnologies.com
www.distributorgears.com

mag442
New Member
New Member
Posts: 10
Joined: Mon Oct 22, 2012 2:17 pm

Re: Distributor Gears

Post by mag442 » Wed Oct 11, 2017 2:20 pm

From that I take it Chinese gears are no good, but I didn't ask about chinese gears. I asked if you can use a quality melonized gear on a billet cam and if one existed for a big block Mopar. If not, is there a better quality bronze gear that will stand up to street driving....last longer than 800-1000 miles? Thanks John

User avatar
MadBill
Guru
Guru
Posts: 12632
Joined: Tue Nov 15, 2005 10:41 am
Location: The Great White North

Re: Distributor Gears

Post by MadBill » Wed Oct 11, 2017 9:40 pm

Walter R. Malik wrote:
Tue Oct 10, 2017 8:35 pm
tresi wrote:
Tue Oct 10, 2017 8:27 pm
Have you seen if anybody would make a cam with an iron gear pressed on for your app?
The distributor gear is in the front on a big block mopar so, it would be difficult to remain a '
strong enough shaft for a roller application, to say the least.
A hydraulic roller with the less valve spring pressures ... maybe.
We've run a number of Jones solid roller SBF cams fitted with iron gears up front...
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

Walter R. Malik
Guru
Guru
Posts: 3415
Joined: Tue Jul 24, 2012 11:15 am
Location: Roseville, Michigan (just north of Detroit)
Contact:

Re: Distributor Gears

Post by Walter R. Malik » Wed Oct 11, 2017 11:50 pm

MadBill wrote:
Wed Oct 11, 2017 9:40 pm
Walter R. Malik wrote:
Tue Oct 10, 2017 8:35 pm
tresi wrote:
Tue Oct 10, 2017 8:27 pm
Have you seen if anybody would make a cam with an iron gear pressed on for your app?
The distributor gear is in the front on a big block mopar so, it would be difficult to remain a '
strong enough shaft for a roller application, to say the least.
A hydraulic roller with the less valve spring pressures ... maybe.
We've run a number of Jones solid roller SBF cams fitted with iron gears up front...
Cool ... then they are able to be out there.
http://www.rmcompetition.com
Specialty engine building at its finest.

Geoff2
Expert
Expert
Posts: 583
Joined: Mon Nov 09, 2015 4:36 pm
Location: Australia

Re: Distributor Gears

Post by Geoff2 » Thu Oct 12, 2017 4:57 am

As the link that mag 442 posted says, they [ Hughes ] make the Melonized gear you need.

BradH
Expert
Expert
Posts: 501
Joined: Wed Apr 03, 2013 11:34 am

Re: Distributor Gears

Post by BradH » Thu Oct 12, 2017 9:07 am

Geoff2 wrote:
Thu Oct 12, 2017 4:57 am
As the link that mag 442 posted says, they [ Hughes ] make the Melonized gear you need.
Hughes sells the Crane gear, they don't make their own. However, they offer it pre-installed on a new shaft whereas Crane offers only the gear.

I'm switching from SFT to solid roller for the first time with my build in progress. A couple of steps I'm taking to reduce bronze gear wear are deburring the cam gear using a wire brush attachment with my Dremel, and using a collar on the distributor shaft that limits the movement of the oil pump shaft when the distributor is installed. I'm also packing the spaces between the teeth of cam and oil pump gears with JGR/Driven assembly grease to help during the initial start-up.

I've asked people on Moparts.com about bronze gear wear issues and am surprised by the differences in lifespan being experienced. Some folks chew 'em up in under 1000 miles, while others go 4 or 5 times that long and replace them simply for piece of mind. I'm hoping the steps I mentioned above help put me in the latter category.

The bronze gears vary a bit between vendors, too. I have Milodon, a Mopar Performance, and 440 Source on hand. The MP and Milodon appear identical to my eyes, but the teeth on the 440 Source gear are cut a little differently (I'd have to post pics to show what I mean). I'm putting the MP part in now and keeping the Milodon as a spare... not sure what to do with the 440 Source one at this point.

PRH
New Member
New Member
Posts: 35
Joined: Fri Sep 08, 2017 4:16 pm
Location: S. Burlington, Vt.

Re: Distributor Gears

Post by PRH » Thu Oct 12, 2017 11:59 am

My understanding is that the Crane steel gear isn't HV oil pump friendly...... Just something else to consider if you're planning on trying one.
Somewhat handy with a die grinder.

Powertrip
Pro
Pro
Posts: 237
Joined: Sat Feb 10, 2007 11:09 am
Location: North West Indiana

Re: Distributor Gears

Post by Powertrip » Thu Oct 12, 2017 5:35 pm

MadBill wrote:
Wed Oct 11, 2017 9:40 pm
Walter R. Malik wrote:
Tue Oct 10, 2017 8:35 pm
tresi wrote:
Tue Oct 10, 2017 8:27 pm
Have you seen if anybody would make a cam with an iron gear pressed on for your app?
The distributor gear is in the front on a big block mopar so, it would be difficult to remain a '
strong enough shaft for a roller application, to say the least.
A hydraulic roller with the less valve spring pressures ... maybe.
We've run a number of Jones solid roller SBF cams fitted with iron gears up front...
The last time I checked with Jones, they were not available for a big block Mopar.
Geoff2 wrote:
Thu Oct 12, 2017 4:57 am
As the link that mag 442 posted says, they [ Hughes ] make the Melonized gear you need.
As has been already posted, Hughes does not make the Melonized gear themselves, and they don't recommend using one for a HV/HP oil pump, which makes me leery of using one at all.
The price of progress is trouble.

Post Reply