Originally Posted by
niznai
Motors coming loose in their mount is not uncommon. I used to have this problem when I started racing some time ago. These days I don't take any chances and use spring washers under the motor holding screws and can say this is one incident that never happened to me in a race. Most peopel don't use these, I am not sure why but every now and then they have the motor come loose in a race and it's annoying.
Thomas, Tamiya's CR01 uses a lot of threaded rods which are 3mm. They're not that long though. There is one part that is long enough (perhaps longer than you need), but it's soft aluminum. It is the steering rod on M05 mini cars from tamiya. The stock kit part might actually be a better idea as it might be steel.
My mentor at the time who sold me the car for a very good price (had a lot of $ behind him, own business etc etc) knew there was a problem with the motor mount but that wasnt his reason for selling it.
We were going to try and design a new motor mount for it (CAD Design) to try and help the problem as we suspected there was too much movement/flex somewhere but we never had the time to go any further with it.
I dont know why the motor will come loose, or if indeed its something in the chassis design that does it, but the car is very light one end with it being 2wd, so all the "stress" is in the motor area of the chassis, maybe this has something to do with it.
All you can do is, if you're parking lot racing, is to sweep the track as best as you can, as I think i've had a stone chew a spur gear on it very easily, as its quite exposed...
Handles very well on a smooth track though, and being 2wd it takes some getting used to, but rewarding to race with when it hooks up....
