Balance factor

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Dave S
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Balance factor

Post by Dave S »

Greetings knowledgeable ones; can anyone tell me what balance factor was originally used by Ariel on the 500cc Red Hunter crankshaft?
Alternatively, any thoughts re what balance factor would be best for this engine to be used for sprinting?
Thanks, Dave.
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paul.jameson
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Re: Balance factor

Post by paul.jameson »

The balance factor varies depending on whether you are using a rigid/plunger frame or a swinging arm frame. But sprinting doesn't take very long so I would have thought there is little chance of vibration from the engine shaking the fillings out of your teeth!
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Simon.Gardiner
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Re: Balance factor

Post by Simon.Gardiner »

A Forum search will find quite a few refs to VH balance factors.
65% gets a lot of mentions (seems to be what the factory used).
David Anderson (who has done a lot of work on Ariel singles) prefer to use 66.66%.
viewtopic.php?p=84714
viewtopic.php?p=70777
viewtopic.php?p=55527
viewtopic.php?p=49603
viewtopic.php?f=4&t=6470&start=20#p42886
viewtopic.php?p=5136

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'55 Huntmaster, '56 VH, ' 51 VH, '62 Arrow, '80 R100RT, '00 Sprint ST (now with a new Arrow project, and just now those 4-stroke Ariel parts can't even make one running bike...)
Dave S
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Re: Balance factor

Post by Dave S »

Many thanks for that info, 65-66% would at least seem to be a good starting point on the understanding that lots of other factors come into play.
Dave S
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