Quote:
Originally Posted by reflexuk
Efficiency is no longer the be all and end all it used to be with modern electrics. The problem with a Hyperdrive is the belt wrap around the pinion which is minimal anyway the more teeth the better here if more teeth equals more grip. Really the transmission ought to mimic a 12th car - but with a belt.
Does it matter which way the rotor is spinning in relation to the rear axle?
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If you mean a direct drive like a 1/12th (just 2 pulleys and 1 belt .. done) then you would need such a large rear pulley to get sensible ratios that the diff height would be huge, not good for many reasons. By using a gear box the diff can be more compact and thus mounted lower which makes loads geometry options possible that simply wouldn't work with a larger diff.
As for does it matter which way the rotor turns relative to the spur/slipper & wheels the simple answer is YES.
Not 100% but in a nut shell if using a traditional 4 gear transmission you will generate more rear traction and the expense of keeping the front end loaded (thus lossing on power steering), if using an 'external idler' set up or the 'hyperdrive' type set up the result is slightly less traction but less front end unloading ( thus more on power steering).
I personally prefer the later, hence why Scorpion runs external idler.