REFLECTIONS

A BRIEF WORD


| February/March 1990


Recently the GEM office received a technical title for review. From the Proceedings of the Institution of Mechanical Engineers in Great Britain, it is entitled, Combustion Engines-Reduction of Friction and Wear. It is available through SAE Customer Service, Dept. 676, 400 Commonwealth Drive, Warrendale, PA 15096.

As we all know, friction remains one of the greatest problems in the internal combustion engines. For pistons to fit the cylinder without blow-by, they and their rings must be very accurately fitted. Doing so raises the level of friction, and this is then minimized with the use of proper lubricants. This title approaches the problems involved in piston skirt friction and the influence of the oil ring type and design on fuel and oil consumption. Another section deals with the measurement and reduction of piston assembly friction. Other sections give an in-depth look at design analysis of various components such as cam and tappet design, piston ring performance, and other technical areas.

This title, while very well written, is highly technical in nature, and is definitely not armchair reading. It does however, provide valuable technical information regarding the subject, and certainly is evidence that a great deal of research has taken place since our vintage engines made their appearance. We recommend this title for those conversant with higher mathematics and familiar with this phase of engineering technology.

Our queries this month begin with:



25/2/1 Unidentified Q. I recently found this old tractor in a junkyard. I would like to know its name, when it was built, and if anyone can supply information on the clutch, as it seems to have been tampered with. Melvin Long, 540 Bartlett St., Harbor Beach, MI 48441. See the photo.

25/2/2C Q. See the photo of old tractor in a junkyard. It is missing air cleaner at Tillotson carburetor. The air cleaner may have been some sort of round cannister filled with shredded steel or similar material. It is also missing the governor linkage which must be a device driven off the fan and connected directly to the carburetor butterfly as there is also an arm on bottom end of butterfly to hook on governor return spring. Would also like to know the horsepower of the engine. Can anyone help please? Joe Menold, 115 South 16th, Sabetha, KS 66534.














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