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Old 03-18-2010, 02:32 PM   #46
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Originally Posted by Roelof View Post
At the end you want a lower weight for all internals, the lower the weight the less you have to balance.
are you drag racing or running 1/8th off road ?
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Old 03-18-2010, 03:40 PM   #47
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1/8 onroad actually.

Our 3.5cc AAC engine has just a 12mm crankshaft with a 9mm hole. To save more weight on the outside there is just an OS shaft and on that we have a centax like aluminium flywheel nut with the 5mm shaft in one piece. Comparing with normal engines we are totally 50 gram lighter

We have runned very small counterweights on the crankshaft but indeed lots of vibrations alhough the performance was very good. With a bigger counterweight the vibrations were less but the performance did not gain much, the lifespan did!
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Old 03-18-2010, 08:59 PM   #48
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there are some differences in what we are trying to accomplish out of the performance between on/off road engines for sure . seen anybody running akuminum crankshafts ? i was talking to a respected engine guy and he was telling me about them shear craziness i tell ya
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Old 03-19-2010, 01:19 AM   #49
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I did read somewhere here about a aluminium crankshaft for a Traxxas engine. I would love to see one but doubt a long life, I even think that in current 3.5cc engines it will not work as we have tried several steel crankshafts and finally came to a different company for hardening it using several steps to get the crankshaft very hard and stil with enough flex without breaking it.
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Old 03-19-2010, 01:49 AM   #50
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Aluminium crankshaft was a joke
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Old 03-19-2010, 07:22 AM   #51
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Aluminum crank was a joke ? In real cars ?
I'm talking rc nitro engines

Have you seen an aluminum crankshaft in a rc nitro engine?
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Old 03-20-2010, 12:49 PM   #52
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Thats what I was meaning as in a "joke"
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