Re: Melonized distrib gear on billet cam?
[Re: Stanton]
#1994869
01/20/16 01:46 PM
01/20/16 01:46 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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What's wrong with bronze ???
The biggest issue with bronze is wear on the bottom of the gear. This is caused by "similar" metals wearing against each other - the bronze gear against the bronze bushing. Its very easily resolved - you get a steel Torrington washer (about.030" thick - no need for the bearing) to fit the shaft , machine and equal thickness off the bottom of the gear and install the washer between the bushing and gear. Wear problem solved.
Also, be sure to run a cam button on the front to keep cam walk to a minimum - most buttons want some movement but if you use a bearing type you can run it with zero gap. DO NOT use an aluminum button. Had the wear issues stated here but the bushing in the block was badly worn when I found out so I added a 3-piece torrington set up and machined the diff and it`s good to go...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Melonized distrib gear on billet cam?
[Re: RTshaker]
#1994914
01/20/16 03:07 PM
01/20/16 03:07 PM
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Joined: Mar 2008
Posts: 860
lancaster,california
johnnycuda
super stock
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super stock
Joined: Mar 2008
Posts: 860
lancaster,california
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I just pulled my motor apart to freshen it, and the bronze gear shows absolutely no wear, either on the teeth or the bottom side of the gear, I did have the nylon button at first, it failed and I installed the steel roller button a fee months ago. My block just had the stock bronze bushing in it for the shaft to slide thru.
I have had the engine in the car since 2007, have probably close to 10,000 miles in that time, I plan to re-use the gear even though I do have a spare already, as I plan to try Drag Week.
1970 'Cuda,Lime Light,499 Indy S/R's 10.70's @125,street driven ALOT!
1966 Barracuda 360,now a 5spd,Hemi Orange,Hot Rod Air,
New daily driver-2003 Ram 2500 Cummins 5.9
'69 Valiant 2-dr, sleeper!
New project---1938 Dodge truck, plan is a 360 with a A500, AC, Calvert rear susp., rack and pinion front with coils.
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Re: Melonized distrib gear on billet cam?
[Re: Stanton]
#1995189
01/20/16 10:48 PM
01/20/16 10:48 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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You probably don't have to worry about .015" BUT the point of machining the thickness out is to ensure that the clearance is still there between the dist shaft and gear but that's easily checked. You don't want pressure on the gear and bushing or you're going to have wear for sure. The dist shaft holds it down so there is plenty of clearance... I put a collar on the dist shaft and keep it at .010 or so after I tighten down the hold down... do the same with a hardened washer.. this also minimizes the timing movement 
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