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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing Gear Noise
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<blockquote data-quote="oexing" data-source="post: 123373" data-attributes="member: 1493"><p>Yes, that was an exercise on the large idler. I once read about someone who had lead weights on the idler for reducing any noise. Actually I don´t expect much noise in my engine, all gears no play in cold engine, lapped with diamond paste for good tooth finish. But sure, with warm engine there must be some play when having steel gears in an alu case. Don´t know if any noise will be transmitted outside, not very much I guess. Anyway, not a complicated mod on this idler : The idler is squeezed between two alu plates pressing on fat o-rings in the five holes , threaded tophat alu spacers inside. So you can tighten the countersunk screws with very mild Loctite. The rubberlike O-rings dampen any dings completely, without them it´s like a steel bell with a ding. </p><p> There are some more places inside the box of troubles that can be noisy - old cam shapes with too much valve clearances , or steel pushrods in an all alu engine - gets you more valve clearance when hot , more than you´d like and clatter from that. All theory, I can only tell in a year or so. [ATTACH=full]35792[/ATTACH]</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 123373, member: 1493"] Yes, that was an exercise on the large idler. I once read about someone who had lead weights on the idler for reducing any noise. Actually I don´t expect much noise in my engine, all gears no play in cold engine, lapped with diamond paste for good tooth finish. But sure, with warm engine there must be some play when having steel gears in an alu case. Don´t know if any noise will be transmitted outside, not very much I guess. Anyway, not a complicated mod on this idler : The idler is squeezed between two alu plates pressing on fat o-rings in the five holes , threaded tophat alu spacers inside. So you can tighten the countersunk screws with very mild Loctite. The rubberlike O-rings dampen any dings completely, without them it´s like a steel bell with a ding. There are some more places inside the box of troubles that can be noisy - old cam shapes with too much valve clearances , or steel pushrods in an all alu engine - gets you more valve clearance when hot , more than you´d like and clatter from that. All theory, I can only tell in a year or so. [ATTACH type="full"]35792[/ATTACH] Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing Gear Noise
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