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Fillet rolling

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If you regularly read the RET-Monitor articles or Race Engine Technology magazine, the value of residual compressive stress will not be lost on you. When considering the design of a critical part, it is common to specify a surface treatment that leaves the surface of the part in a state of compressive stress. Such processes have often been used in a remedial sense in the past, as a quick-fix for a fatigue problem. With the increasing use of stress analysis software, however, engineers are...
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Active dyno test cells

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Advanced active engine dynamometers are invariably housed in test cells, where the test environment can be closely controlled. This month I want to look at the design and engineering requirements of these cells, specifically the installation and types of ancillary systems including, but not limited to, coolant and environmental systems. Engine testing is essentially a scientific experiment and, as such, as many factors as possible need to be tightly controlled to ensure reliable and...

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Le Mans transmissions

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The Le Mans 24 Hours is the sternest test for all racing vehicle systems, especially the transmission. So what are the steps transmission manufacturers take to ensure that these components are durable enough to survive the punishment of a 24-hour race, while still remaining lightweight and as efficient as possible? One area that has seen considerable development in recent years is the material choice for the transmission casings, with new techniques allowing for lighter units that still...
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Variations in lash cap design

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Lash caps (also widely known as tappet shims) are probably the most innocuous of valvetrain components. They are inherently stiff and, owing to their size, they weigh very little. There is therefore no real incentive to change their design, because any gain in stiffness or low mass will be negligible. It is far better that the design engineer spends his or her time in the pursuit of loftier goals. The humble lash cap is there simply to provide some basic adjustment in the system such that...
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Composites

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There are a wide range of materials used in the racing powertrain, but although much progress has been made since man started motor racing more than a century ago, the vast majority of a modern race engine and transmission is still made of metal. However, this has been slowly changing for some time. Currently there are few applications of composites in race engines, although development is limited in many cases by regulation. In the past decade we have seen various engines sporting...

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