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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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<blockquote data-quote="greg brillus" data-source="post: 116148" data-attributes="member: 597"><p>Ok so i have checked out this new crank assembly i have here, very similar to David's one with some minor differences but my pistons are much heavier on account of the pistons being 92 mm. Both little ends of rods equal 367 grams, pistons are 446 grams each. David found he needed 113 grams opposite the big end to bring the crank to a neutral balance and I needed 117 grams, so very similar. Only difference now is I'm thinking this crank should be balanced to 60% as it is going into a new featherbed frame. I will need a hung weight of around 388 grams to achieve this.......So I'm going to need plenty of machining at the big end of the flywheels to make this happen. I inquired about the cost of a length of Mallory metal, about $250 AUD for a piece 1/2" diameter and 200 mm long.......... Where's that damned hacksaw Bill..............</p></blockquote><p></p>
[QUOTE="greg brillus, post: 116148, member: 597"] Ok so i have checked out this new crank assembly i have here, very similar to David's one with some minor differences but my pistons are much heavier on account of the pistons being 92 mm. Both little ends of rods equal 367 grams, pistons are 446 grams each. David found he needed 113 grams opposite the big end to bring the crank to a neutral balance and I needed 117 grams, so very similar. Only difference now is I'm thinking this crank should be balanced to 60% as it is going into a new featherbed frame. I will need a hung weight of around 388 grams to achieve this.......So I'm going to need plenty of machining at the big end of the flywheels to make this happen. I inquired about the cost of a length of Mallory metal, about $250 AUD for a piece 1/2" diameter and 200 mm long.......... Where's that damned hacksaw Bill.............. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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