Hello, nice project !
About the 4th gear, I have tried several things on my own mid motored B3 and the latest CR2 solution with the extra idler attached to the motorplate is by far the best solution I have found. Reliable, quiet, and if you managed to drill your supporting axle out of center (rather easier than dead on center ,when you have no lathe and just a drill press !) , you'll be able to adjust the gear mesh with the main spur, before adjusting the mesh between the motor and the new idler.
In order to gain space on the motor plate, you'll just need to re-drill a new elongated hole for the bottom motor screw, and use a slightly smaller spur gear than usual- I chose 75 teeth. The gearing window is still more than sufficient. J
ust my two cents, keep us posted. Should you need pictures I can provide with pleasure. My whole car is a total hack job but it works amazing ! :- )
|