Crankshaft Balancing
03-18-2010, 03:40 PM
#47
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!
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!
03-18-2010, 08:59 PM
#48
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 
shear craziness i tell ya
03-19-2010, 01:19 AM
#49
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.
03-19-2010, 01:49 AM
#50
Tech Fanatic
Aluminium crankshaft was a joke
03-20-2010, 12:49 PM
#52
Tech Fanatic
Thats what I was meaning as in a "joke"
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