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Archive

The gapless ring

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It may sound obvious, but to assemble a piston ring into its grooves in a traditional two- or three-ring piston will require the ring to be split at some stage during manufacture. Placed on some form of mandrel and heat treated thereafter to an out-of-round set, once placed onto the piston and assembled in the cylinder, the theory is that it should exert a more or less constant pressure all the way around the bore. Simple and yet highly effective, there are however two issues created by...

Keronite coatings

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In a recent RET-Monitor article on the subject of surface treatments for magnesium, mention was made of plasma electrolytic oxidation treatments. One such treatment that has found application in motorsport is Keronite, and while it is popularly used for surface treatment of magnesium components, the process can also be used with the other popular light alloy materials, namely aluminium and titanium. I discussed the process with Dr James Curran, principal materials engineer at Keronite....

The heat is on

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One of the most difficult tasks for an experienced dyno engineer is to measure the amount of heat rejected to the engine coolant. On the face of it, fitting thermocouples - one in the engine water going in and another as it comes out and then measuring the coolant flow rate, would seem a simple enough task. But when we analyse the accuracy of the instruments used, the level of uncertainty calls for a more considered approach. The problem, as you probably appreciate by now, is not the...

High-speed raceboat propeller design

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Although attaining speeds up to and in excess of 100 mph on tarmac is not an arduous task, it is a rather more multi-faceted undertaking on water. One of the many considerations of high-speed marine applications is transmission and propeller design. There are a number of high-speed marine formulae that use various propulsion systems, including water-jet drives, super-cavitating and surface-piercing propeller drives. The Oulton Broads and surrounding areas, in Suffolk, England, have...

Which performance to push?

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After having written in my previous article about process control issues, something occurred to me about the differences between engine applications. In general, RET-Monitor and Race Engine Technology magazine put an emphasis on high-performance engines. This often means also high-revving engines, due to the simple assumption that the easiest way to make power is make use of high rpms. What came to mind is what this statement means in regard to other engines. The reason I started thinking...
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