Minisport

KAD 5 speed racing gearbox, with LSD, CW&P, fully assembled

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KAD 5 speed Racing Gearbox

When KAD decided to produce their own 5 speed race gearbox there were two main criteria which had to be met by the design. Firstly it should fit a standard gear casing without expensive modifications. Race engines can have blowups and replacing an expensive casing just adds to the misery. Secondly it should be direct drive in fifth, we figured that this would offer the maximum torque output at the point where aerodynamic drag was at its greatest: high speed. The other 5 speed boxes on offer were all of the over driven fifth type which meant torque would be lost when engaging fifth. The end result is a no compromise race gearbox that is easy to use with gear ratios ideally suited to today’s race tracks with their frequent slow to medium speed corners. This gearbox is a special order only item and a delivery time delay will apply, please either contact us at sales@minisport.com.au or call us on 08-8177-1275 to find out the delay

 

The compact gear train fits into a standard A+ rod change gear casing and has straight cut gears with face dogs, typical of conventional racing gearboxes. The gears are manufactured from a vacuum arc remelted steel (VAR), this is a very high specification material which has higher strength and greater purity than commercially produced steels giving stronger gears and allowing a narrower gear width and lower frictional losses. The selector forks are made from aluminium bronze which has good wearing properties and high bending resistance. The selector mechanism has been designed to offer a fast reliable change and the shift pattern has been arranged with first on a dog leg, to the left and back.

 

The compact gear train fits into a standard A+ rod change gear casing and has straight cut gears with face dogs, typical of conventional racing gearboxes. The gears are manufactured from a vacuum arc remelted steel (VAR), this is a very high specification material which has higher strength and greater purity than commercially produced steels giving stronger gears and allowing a narrower gear width and lower frictional losses. The selector forks are made from aluminium bronze which has good wearing properties and high bending resistance. The selector mechanism has been designed to offer a fast reliable change and the shift pattern has been arranged with first on a dog leg, to the left and back.

 

The KAD pinion bearing support housing is used with the 5 speed to reinforce the free end of the mainshaft, this gives better pinion gear life as it prevents the pinion from trying to climb the crown wheel under hard acceleration (available separately for four speed boxes).

 

A centre oil pick up pipe is also supplied as the laygear layout requires a different path for the pipe. Gear ratios have been chosen with competition in mind.
What has resulted is a 5 speed that behaves like a four speed with two second gears; the high and low second gears mean that the old frustration of gearing four speeds for modern circuits is gone; the engine is always in its correct rev range to pull out of corners.

  • Face dog type, straight cut gears.
  • Compact gear train fits into a standard rod change casing
  • 1:1 direct top gear, lower torque loss in fifth gear compared to an overdriven 5 speed unit.
  • Dog leg first; 2nd, 3rd, 4th and 5th gears in 'H' pattern.
  • Gears manufactured from S156, an Aerospace VAR steel, selector forks from AB2 aluminium bronze.
  • Ratios: 1st 2.616:1, 2nd 1.989:1, 3rd 1.671:1, 4th 1.294:1, 5th 1:1
  • Input and output spline as standard Mini
  • Supplied with extra bearing support for pinion end of main shaft and centre oil pickup pipe

 

kad-pinion-support-bearing.jpg kad-pinion-support-bearing2.jpg

 

POA