S&S gear drive
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Joined: Apr 2011
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From: Forest, Ontario, Canada
One of the inner cam gears was out of spec; there was a "catch" when rotating the the cams; too tight. The outer cam and pinion gear were not an issue.
I did not say that gears would run with less noise than chains but the gear driven cams on my 95" motor do in fact run with less noise that the OEM chain drive setup.
If you ear is too "picky" maybe an air cooled, odd firing vtwin is just not your cup of tea.
I did not say that gears would run with less noise than chains but the gear driven cams on my 95" motor do in fact run with less noise that the OEM chain drive setup.
If you ear is too "picky" maybe an air cooled, odd firing vtwin is just not your cup of tea.
When I was checking backlash, it bothered me that there where spots with .0005" and spots that where .002". I started marking the tighter teeth on the crank gear and turn the crank one full revolution and check it again, obviously on a different tooth of the cam gear, and it would be fine. I am assuming that there are harmonics from the inconsistent backlash and it is traveling through the valve terrain and it is being heard in the rocker box. I wish I had just sent them back, but of course I bought them off a dealer on flea bay, I live in Canada and if I don't drive the stuff back over I pay stupid amounts in brokerage fees. I am gonna cut the oil filter apart and make sure it is clean. Then I will probably just take it apart and see about buying another set of gears.
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From: Illinois
My S&S 585 gears are silent! My 106 runs quieter than stock! Techs at the HD dealer when I did my dyno couldn't believe how quiet and smooth my bike ran and I have roller rockers too.
If your gears are to tight S&S offers a looser set that can be ordered (it's in the instructions with the gear drive kit).
If your gears are to tight S&S offers a looser set that can be ordered (it's in the instructions with the gear drive kit).
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From: Forest, Ontario, Canada
yes, I understand that, but the couple teeth that have .002" will become .0025-.003", it will probably have a clack at idle....carbed, loppy idle. I am going to see if S&S will sell me a outer cam gear, mine has to be improperly machined.
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From: san antonio
I repeat, those gears are manufactured by Andrews. I would bet a six pack that if you call them (can't remember who I dealt with) they will agree to check the gears out and if out of spec, send you another one. If your crank runout is truly .0003", you shouldn't have gears that loose anywhere in the rotation.
Last edited by djl; Jun 25, 2014 at 03:18 PM.
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From: Forest, Ontario, Canada
I repeat, those gears are manufactured by Andrews. I would bet a six pack that if you call them (can't remember who I dealt with) they will agree to check the gears out and if out of spec, send you another one. If your crank runout is truly .0003", you shouldn't have gears that loose anywhere in the rotation.
Andrews Products "G" series cams which use S&S gear drives have ball bearings on both front and rear cams.
ce gear drives generate much lower bearing loads than chain drives, there is no need for roller bearings. Also, gear drive cams with roller bearings will make more noise during engine operation.
I agree with you, no where should there be that much clearance (.002"), honestly, that is why I started this thread. I am no where near new at measuring with dial indicators, vernier calipers, micrometers or inside bore gauges, however I am new at working on the American v twin. Don't get me wrong, I really appreciate the insight by all, that is what I was looking for. I just want you to undersdand, I am a very experienced person, I am confident in my measurements and my tools. I measured my crank runout with my mitutoyo dial indicator with .0001 graduation, the same one I use when I press multi piece crankshafts.
I will call Andrews, but I am doubtful they will do much as these gears have been run quite a bit, probably 1200m.
Last edited by Wildman9; Jun 25, 2014 at 07:55 PM.
HDF Community Team
Joined: Jun 2006
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From: san antonio
I am sorry, I am just going by what I read in Andrews instructions.
Andrews Products "G" series cams which use S&S gear drives have ball bearings on both front and rear cams.
ce gear drives generate much lower bearing loads than chain drives, there is no need for roller bearings. Also, gear drive cams with roller bearings will make more noise during engine operation.
I agree with you, no where should there be that much clearance (.002"), honestly, that is why I started this thread. I am no where near new at measuring with dial indicators, vernier calipers, micrometers or inside bore gauges, however I am new at working on the American v twin. Don't get me wrong, I really appreciate the insight by all, that is what I was looking for. I just want you to undersdand, I am a very experienced person, I am confident in my measurements and my tools. I measured my crank runout with my mitutoyo dial indicator with .0001 graduation, the same one I use when I press multi piece crankshafts.
I will call Andrews, but I am doubtful they will do much as these gears have been run quite a bit, probably 1200m.
Andrews Products "G" series cams which use S&S gear drives have ball bearings on both front and rear cams.
ce gear drives generate much lower bearing loads than chain drives, there is no need for roller bearings. Also, gear drive cams with roller bearings will make more noise during engine operation.
I agree with you, no where should there be that much clearance (.002"), honestly, that is why I started this thread. I am no where near new at measuring with dial indicators, vernier calipers, micrometers or inside bore gauges, however I am new at working on the American v twin. Don't get me wrong, I really appreciate the insight by all, that is what I was looking for. I just want you to undersdand, I am a very experienced person, I am confident in my measurements and my tools. I measured my crank runout with my mitutoyo dial indicator with .0001 graduation, the same one I use when I press multi piece crankshafts.
I will call Andrews, but I am doubtful they will do much as these gears have been run quite a bit, probably 1200m.
I can only speak to the noise issue based on my own personal experience and can tell you that some do whine a bit but the whine is not objectionable; the "klack" on the other hand would make me crazy. The few sets that I have installed were within the Andrews spec for lash, checked with Plastigage and ran quieter than the chains they replaced. The gear sets that I have installed were all on pre '07 models.
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Joined: Jun 2006
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From: san antonio
Good luck, let us know what Andrews has to say.
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