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  #41  
Old 14th May 2019
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i do not think you will lose any mesh. you take away from the pinion and add to the oil drive, the dimension will stay the same. if the assy is tight fit, then the shear forces will be nil so the 1/2 moon drive and key will act as one. the bronze should handle the load since this is not like the ironhead setup where there is a little play.
there are several propeller shops around here that can actually cast in an extension but then again, no big deal to machine one from a stock piece of bronze material, probably get the id and od from off the shelf.
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  #42  
Old 14th May 2019
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Looks like that pinion was heat treated after it was machined.
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  #43  
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What does that bronze gear fit?
Unless some hella good machine work was done before it was cut down,
It was made with the shoulder.
Then the shoulder was cut down.
(look at the shoulder to gear joint in pic 3)
That does keep the spacing correct.

Stock buell bronze gear for comparison:
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  #44  
Old 14th May 2019
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I see ur point.
Perhaps both are custom pieces ?
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  #45  
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Fun Facts:
We have been erroneously been calling the oil pump gear mesh a 'worm gear" configuration.
It's actually 2 right handed helical gears in a 90 degree or cross axis.
edit: (shoulders or 'hubs' are common on them)

The teeth on these gears stay in contact for longer than straight teeth, which allows them to transmit higher loads at higher speeds than spur gears.
Gears are carbon steel for strength. Teeth are hardened for increased wear resistance.
(once axial play wears the hardness, pop goes the weasel)

For gears to mesh correctly, they must have the same pressure angle and pitch.
Helical gears can be configured to transmit motion in a straight line or at a 90° angle. To transmit motion at a 90° angle, pair two gears with the same tooth direction.
To transmit motion in a straight line, use one left-hand and one right-hand gear.
To change speed and torque in your assembly, pair two gears with different numbers of teeth.
https://www.mcmaster.com/helical-gears

McMaster doesn't seem to have a 10 tooth heli gear or any in bronze.
But they are available somewhere, just got to find it.

There is also 10 teeth on the drive gear at the pinion shaft and 20 teeth on the oil pump driveshaft.
2:1 ratio of the gears means the oil pump RPM is half the speed of the engine.

Last edited by Hippysmack; 14th May 2019 at 20:35..
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  #46  
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i think you meant 1/2 speed.
two crank rotation to one pump.

you wouldn't happen to have the dimensions on the pump gear?
going back to foggy hollow of the mind, it resembles the replacement gear on a chrysler slant six distributor.
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  #47  
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I swear I'm starting to worry about me.....
You're right, the oil pump turns half speed of the engine.
I changed that...
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  #48  
Old 14th May 2019
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talk about a scavenging son of a gun?!?
anywho
these people can be a source of bronze gears
https://www.bostongear.com/products/.../helical-gears
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  #49  
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That's what I'm wondering.
The op on Facebook may have a distinct affiliation with ordering these gears.
But, it could have been from a distributor or oil pump from an automobile.

I have been off and on looking into the sizes and learning nomenclature today.
I have my old gear I can measure.
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  #50  
Old 16th May 2019
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I've been having a hard time measuring this thing.
I don't have the right tools to measure the teeth.
The helix angle doesn't look to be more than a few degrees from the lead angle from eyeballing.
I got the lead angle at 25 degrees.
Bore app .634"
OD app 1.192"
Width app .629"




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