In my previous Heads-Blocks article I described the advantage of Compacted Graphite Iron (CGI) on one of the most severe cylinder head failure modes, Thermo Mechanical Fatigue (TMF). The main area of interest then concerned differences in material properties. Of course, material is not the only contributor to TMF robustness of cylinder head design, so in this article I will give an insight into another parameter influencing TMF, coolant jacket design. As mentioned previously, a cylinder...
At the time of writing there is much speculation about the new engine regulations in Formula One. Originally scheduled for 2013, the fact that discussions with the various interested parties are still ongoing must surely indicate that some form of accord has yet to be struck. In order to design and develop a new unit, as well as working out the best options in any semblance of order, two years is perhaps pushing things a little, so 2013 seems rather optimistic now. Gone are the days when...
As anyone who has ever built and tested prototype engines will vouch, apart from not getting the thing to fire and run, the next nightmare is the steady drip, drip, drip of a fluid on the dyno test bed's undertray. Large leaks - whether oil or coolant - are, funnily enough, usually the easiest to solve, where a loose bolt or a forgotten hose clip are generally quickly dealt with. Worse by far though are the slight 'weeps' - the leaks that appear out of nowhere, travel down to a...
We have become accustomed to the fact that many race motorcycle exhaust systems are made from titanium. Owing to the fact that they are generally much better supported than on most racecar installations, the problems with fatigue and creep are nowhere near as serious. One company, Good Fabrications, with extensive experience of many types of exhaust materials has applied its knowledge of special high-temperature materials used in other race series with great success to motorcycle racing,...
In a recent article, the subject of using fasteners for composite components was discussed. The number of components for which composites are considered is increasing considerably, and in some race series their use is limited by regulations. There are many areas in a Formula One engine, for example, where composites are expressly forbidden, but in production-based series, people are free to use composite components much more freely and so they have developed techniques to make their use...