Quote:
Originally Posted by Legacy555
How about putting a second hole in the motor plate so that a hyfradrive with 84t spur can be used? Smaller spur gears cause fouling between the idler and the hydradrive casing.
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The hole that locates the idler post is countersunk on the other side of the motorplate (otherwise the motor would not be flush to the motorplate) and a extra countersunk hole so close to the other would weaken the area as there is not much cf left.
I choose the 78t as it is the kit spur and its what most people use, i am in the process of getting some 78t hydra drive spurs made. Also using the smaller spur allows you to move the motor more to the rear of the car.
And as you point out as a 78t spur is about 1mm smaller od than the hydradrive casing you would need to shave / dremel off half the width of teeth on the idler, so the hydra casing does not rub against the idler gear, but as the idler is over twice the width of the spur gear this would not cause a problem. But this only needs to be done if your using the hydradrve.
If you just using the two pad slipper then there are no extra mod's required.