Novak Brushless - fan or no fan? and Gearing?

[jim76]

I have just placed an order for two novak brushless systems for my ZX5 and B4.
Both systems have the new sintered arms. I know that sintered have stronger brakes, slightly more power and run cooler (is that the motor or speedo as well?).

What i'm keen to know is whether i can chance running the speedo with out the fan in either 2 or 4wd? i'm guessing the 6.5 in a B4 might be ok without the fan as the load shouldn't be too great. but a 4.5 in the ZX5, unlikely? Has anyone placed the fan on it's side next to the speedo so it fits under the shell?

also does anyone have a good starting point for gearing the B4 (6.5) and ZX5 (4.5)?

many thanks