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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft availability.
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<blockquote data-quote="Tom Gaynor" data-source="post: 4052" data-attributes="member: 4034"><p><strong>Cam designs</strong></p><p></p><p>PEI explains where his cam designs came from in FYO (and in his autobiography). There wasn't a lot of science involved, largely because he found he had to produce cam masters at his leisure, so long as they were ready in about 30 minutes. Gary Robinson 105 cams have some connection with Ian Hamilton that I can't remember. Ian designed them? Modified another design? Commissioned them? Doubtless there are details in Ian's MPH articles. What I remember Gary saying is that they are basically Mark II's with less overlap, and that many users think there's less spitting back as a result. I can't say I'd noticed, which isn't to say it isn't true.</p><p>From observation, Vin cams are look mild, similar to Rudge Special cams ("Special" means "Very Ordinary" in this context). Rudge Replica cams, which I use (in a Rudge Ulster), are two near-parallel flanks with a base circle at each end - like the classic description of a Manx Norton cam: a housebrick rotated off-centre. They (Replica cams) work very well. I half-expected a buzzy engine, but in fact it pulls like a train from zero revs to god knows what. CR is about 7:1. I suppose that having two small valves to shift rather than one big one gives more opportunity for aggressive valve acceleration rates.</p><p></p><p>Stepping back a bit, a Rapide produces 45 bhp, 22 1/2 bhp per pot. That isn't exactly radical. As noted elsewhere, the legendary Guzzi 500 cc plonker, the Gambalunga, named for its long stroke, originally had dimensions of 84 x 90. I'm not complaining: a big, softly tuned motor makes for a very pleasant bicycle at, say, 60 to 90 mph. I'd hate to lose that in pursuit of performance I'd never use.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 4052, member: 4034"] [b]Cam designs[/b] PEI explains where his cam designs came from in FYO (and in his autobiography). There wasn't a lot of science involved, largely because he found he had to produce cam masters at his leisure, so long as they were ready in about 30 minutes. Gary Robinson 105 cams have some connection with Ian Hamilton that I can't remember. Ian designed them? Modified another design? Commissioned them? Doubtless there are details in Ian's MPH articles. What I remember Gary saying is that they are basically Mark II's with less overlap, and that many users think there's less spitting back as a result. I can't say I'd noticed, which isn't to say it isn't true. From observation, Vin cams are look mild, similar to Rudge Special cams ("Special" means "Very Ordinary" in this context). Rudge Replica cams, which I use (in a Rudge Ulster), are two near-parallel flanks with a base circle at each end - like the classic description of a Manx Norton cam: a housebrick rotated off-centre. They (Replica cams) work very well. I half-expected a buzzy engine, but in fact it pulls like a train from zero revs to god knows what. CR is about 7:1. I suppose that having two small valves to shift rather than one big one gives more opportunity for aggressive valve acceleration rates. Stepping back a bit, a Rapide produces 45 bhp, 22 1/2 bhp per pot. That isn't exactly radical. As noted elsewhere, the legendary Guzzi 500 cc plonker, the Gambalunga, named for its long stroke, originally had dimensions of 84 x 90. I'm not complaining: a big, softly tuned motor makes for a very pleasant bicycle at, say, 60 to 90 mph. I'd hate to lose that in pursuit of performance I'd never use. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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