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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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<blockquote data-quote="Little Honda" data-source="post: 115814" data-attributes="member: 667"><p>I can only compare my first std. Rapide, which was smooth up to 4000rpm and had some vibs over 5000rpm,</p><p>using MKIII cams. It reached max. 5.800 rpm at 110mph. I had the crank done by Tony Maughan, who´s</p><p>balance factor I did not know. When racing Ernst´s BL, it was different: It was dead smooth up to 6500rpm</p><p>and pulled much stronger than the Rapide, no comparison. I think, Ernst told me once, he used 55% balance</p><p>factor, but I am not sure. His BL was the only twin, which did not move backwards on the paddock stand, </p><p>when revving up to 6500rpm. My Norvin, using a D-Shadow engine with an original crank, does vibrate more</p><p>than the BL, but is also smoother, than the Rapide, using MKII cams, 8:1cr, 32mm inlets, double ignition.</p><p>My impression: For speeds over 100mph, a higher balance factor is recommendable.</p><p>Also Erich Kruse´s Comet with Ernst´s short stroke engine revs up to 8500rpm is quite smooth, but I do not</p><p>know more abt its engine. It is stronger than Ernst´s 1948 racing Comet with normal crank and max revs</p><p>up to 6200rpm. Erich´s engine feels a bit less torquey under 4500rpm, but stronger, exceeding 5000rpm, than</p><p>the older Comet. Erich uses a 5 speed box, which compensates the lower torque, compared to the 4 speed</p><p>box of the 1948 Comet racer.</p></blockquote><p></p>
[QUOTE="Little Honda, post: 115814, member: 667"] I can only compare my first std. Rapide, which was smooth up to 4000rpm and had some vibs over 5000rpm, using MKIII cams. It reached max. 5.800 rpm at 110mph. I had the crank done by Tony Maughan, who´s balance factor I did not know. When racing Ernst´s BL, it was different: It was dead smooth up to 6500rpm and pulled much stronger than the Rapide, no comparison. I think, Ernst told me once, he used 55% balance factor, but I am not sure. His BL was the only twin, which did not move backwards on the paddock stand, when revving up to 6500rpm. My Norvin, using a D-Shadow engine with an original crank, does vibrate more than the BL, but is also smoother, than the Rapide, using MKII cams, 8:1cr, 32mm inlets, double ignition. My impression: For speeds over 100mph, a higher balance factor is recommendable. Also Erich Kruse´s Comet with Ernst´s short stroke engine revs up to 8500rpm is quite smooth, but I do not know more abt its engine. It is stronger than Ernst´s 1948 racing Comet with normal crank and max revs up to 6200rpm. Erich´s engine feels a bit less torquey under 4500rpm, but stronger, exceeding 5000rpm, than the older Comet. Erich uses a 5 speed box, which compensates the lower torque, compared to the 4 speed box of the 1948 Comet racer. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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