Vintage racing isn’t just a hobby, it is a passion. And an art. We are quite pleased to have a guest article by Don Racine of Mini Mania about using the ribcase transmission from the ubiquitous “Spridget” in the vintage racing application. The most conventional gears in the everyday manual transmission are helical cut. The single biggest advantage of this design is the reduction of noise that is inherent in the more efficient, easy to manufacture straight cut gears. The helical patterns allow for a much less violent meshing of the gears. But, the decreased noise comes with a few penalties. The first of which is sideload – because the gears are helical, some of the thrust is lost in the rotational direction and thus must be controlled with a thrust surface. The thrust surface most often used is called thrust […]
JD Classics – one of the world’s leading classic car racing and restoration businesses – has launched its very own five-speed all-synchromesh gearbox for classic Jaguars. Designed by a team of JD Classics’ expert technicians and a well-respected motorsport engineering company, the gearbox is available to order now. Engineered with synchromesh on all ratios, helical cut gears and a reinforced aluminium cast casing, it is capable of handling up to 400hp and 350 ft/lb of torque.