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Archive

Slipper clutches - coil or diaphragm?

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In a previous RET-Monitor article we looked at how these 'Back Torque Limiters' or 'Slipper Clutch' units operate, and their particular advantages in motorcycle applications. They allow a controlled slipping of the clutch until the speeds of both the rear wheel and the engine are matched, and have found their way into many motorcycle race formulae including World and British Superbike, Supermoto and even Motocross. While not exclusively suited to motorcycle applications,...

Pushrods - one-piece or three-piece?

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When we look at the offerings from the major pushrod manufacturers, we see that there are many who offer assembled pushrods made from multiple pieces - usually three - with a typical race pushrod consisting of a long, slender central section combined with two ends which are assembled into the central section. Dieter van der Put, in his recent article looked at a method of producing a single-piece pushrod from three pieces, using the process of friction welding. So, what are the advantages...

Small springs that do the job

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Working with a production engine and increasing the stroke on it can often lead to problems in the valvetrain. That hasn't been the case for Rhys Millen Motorsports (RMR), who decided - with four months to spare - that it would build up a Hyundai Lambda V6 from 3.8 to nearly 4.1 litres and install a single turbocharger for the 2010 Pikes Peak Hillclimb. By the time the engine was completed it developed 698 hp and 670 lb-ft of torque. "When we were running the stock engine with a...

Why are valves required to be ductile?

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When you visit a large motorsport trade show, as I recently did, there will be a number of engine component suppliers present, some of which will be selling high-quality valvetrain components. In the display cabinets ranged before you, among other things you are likely to see valves of all sizes, shapes and materials, there for you to examine and discuss with the various specialists manning the stands. Among these exhibits, there is sometimes a single, horribly distorted part, proudly...

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