Question about rod bearings
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bmikarts has 80 inch shovel rods with 2 hole crank pin with nuts for 60 bucks. They bought out alot of the Dixie stuff. Dont know if the rods are Dixie or other and of what quality? Also would not the bigger evo rollers spin slower than the smaller ones? I am not 100 percent they really roll anyway. I had a scout once my buddy built that the cages faced each other between the male and female rod with long rollers with short ones on the outside. So in theory each rod should have had independent rollers from each other. Seemed to run fine with no issues.Comment
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bmikarts has 80 inch shovel rods with 2 hole crank pin with nuts for 60 bucks. They bought out alot of the Dixie stuff. Dont know if the rods are Dixie or other and of what quality? Also would not the bigger evo rollers spin slower than the smaller ones? I am not 100 percent they really roll anyway. I had a scout once my buddy built that the cages faced each other between the male and female rod with long rollers with short ones on the outside. So in theory each rod should have had independent rollers from each other. Seemed to run fine with no issues.
JimComment
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Thats what I was told, that it would never work. God and fools? My buddy actually built motors for a living, he did not want to do it. It was my choice to try it, I was younger and dumber then. Eventually sold the scout to a guy that raced it at sturgis a long time ago. It was a strong runner. IMHO I think they skid alot, but also roll. While I would not recommend it, seemed to work. We also tried with hard shell bearings in the rods, back to back, that one part was in the female and the other half in the male rod. That chief is still running around and gets ridden alot. Maybe just luck, because as you say and I totally agree with you, it really should not work at all. Also has anybody tried or is there enough room or benefit to run the roller like bearing set up, two stroke style, in the small end?Last edited by flatman; 09-08-2021, 9:58 AM.Comment
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Facing the retainers toward each other on the male rod will work and has come into fashion occasionally. The idea being that the male races are closer together than the female rod so have more side to side movement at the small end than the female. So the thought was that the longer rollers with out the gap in the center would stabilize the male rod to match the female. I don't see any real advantage certainly when you figure the trouble sourcing them but they run fine. If the wrist pins are parallel to the cylinder base I have never found any evidence of much side movement. I suspect you are remembering wrong.
DustyDriving that train, high on cocaine
Casey Jones you better, watch your speed
Trouble ahead, trouble behind
And you know that notion just crossed my mind​Comment
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Facing the retainers toward each other on the male rod will work and has come into fashion occasionally. The idea being that the male races are closer together than the female rod so have more side to side movement at the small end than the female. So the thought was that the longer rollers with out the gap in the center would stabilize the male rod to match the female. I don't see any real advantage certainly when you figure the trouble sourcing them but they run fine. If the wrist pins are parallel to the cylinder base I have never found any evidence of much side movement. I suspect you are remembering wrong.
Dusty
JimComment
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Yes, on all the motors prior to '73, all the big end cages were the same, so you had one in each race of the rear rod and two facing each other in the front rod, with wider rollers as you say. That design goes back to the earliest twins in 1916 (?) maybe. It does work fine and offers the highest roller count and widest rollers of all the current big twin set-ups. (I do think the one piece cages are more stable at high rpm, but that is my opinion only, and I don't have anything to back it up.)
Jim
DustyDriving that train, high on cocaine
Casey Jones you better, watch your speed
Trouble ahead, trouble behind
And you know that notion just crossed my mind​Comment
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DustyDriving that train, high on cocaine
Casey Jones you better, watch your speed
Trouble ahead, trouble behind
And you know that notion just crossed my mind​Comment
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Just to clarify, the motor was built with 2 sets of long rollers in the bottom end. It had half of the long roller in the female rod and the other half in the male rod. Same with the hard shell bearings. Half in the female and half in the male. True, should not work, but did. The question about the small end having the wrist pin on rollers was from 2 stroke motors I have seen. Was thinking about friction not if the pin was parallel. Some of that stuff turns really high RPM so was wondering if it was possible on a HD or if any benefit. Sorry did not mean to highjack the threadComment
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Just to clarify, the motor was built with 2 sets of long rollers in the bottom end. It had half of the long roller in the female rod and the other half in the male rod. Same with the hard shell bearings. Half in the female and half in the male. True, should not work, but did. The question about the small end having the wrist pin on rollers was from 2 stroke motors I have seen. Was thinking about friction not if the pin was parallel. Some of that stuff turns really high RPM so was wondering if it was possible on a HD or if any benefit. Sorry did not mean to highjack the thread
JimComment
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Take my 45 and outrun em all ..Comment
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