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  1. PJGD

    A Diesel Wins at Le Mans

    Well, it looks like my original question from thread108-64541 has been answered; An Audi R10 car with a V12 5.5L turbo diesel convincingly won the 2006 Le Mans 24 hour race: http://www.lemans.org/24heuresdumans/live/pages/chronos_gb.html The second team car had a number of problems, and came...
  2. PJGD

    Port Flow Cd's - Valve in / Valve out?

    I have had no direct experience of cylinder head porting or port flow studies, but I gather that it is common to calculate the inlet port Cd which provides a number that can then be benchmarked against other port designs. A number of questions arise:- 1) What is a typical Cd value at full lift...
  3. PJGD

    Roller-Bearing Cranks; Again!

    Not so much a question, as a comment. Thread108-76629 was interesting but the bulk of the comments were negative towards the use of rolling element bearings for crankshaft use in conventional engines (as opposed to 2-strokes), and particularly for diesels. The opinions seemed to be that the...
  4. PJGD

    Diesels at Le Mans

    I see that the first diesel-engined car to qualify and race at the 24 hour race at Le Mans was a French entry in 1949, the first race held after the war. The car was the Delettrez Diesel entered by brothers Jean and Jacques Delettrez and was of 4395 cc 6-cylinder. It did not finish, running...
  5. PJGD

    Telescopic Valve Engines?

    It is well known that Dr. Alfred J Buchi invented the turbocharger in c. 1905 while in charge of Research at Sulzer Engines in Winterthur, Switzerland. Not as well known is that he developed a &quot;telescopic valve&quot; engine in the 1950's, and an example is shown here: - <IMG...
  6. PJGD

    Spring Material for Hot Environment?

    I would welcome suggestions for a spring material that can operate in a hot environment indefinitely. Specifically, a material which might be applicable in a location where one might otherwise use a helical compression spring. The environment involves immersion in a somewhat corrosive fluid...

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