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Simple Idea Reduces Cylinder-bore Wear

13th December 1946
Page 40
Page 40, 13th December 1946 — Simple Idea Reduces Cylinder-bore Wear
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Keywords : Piston Ring, Cylinder, Piston

1-1-IERE have been many instances in I which the simplest devices have succeeded where more complicated arrangements have failed. We have all heard of the labyrinth method of forming a seal by cutting a series of grooves around a shaft or other member, but who would have thought that the principle could be applied to an oil engine piston?

Mr. J. Keeling, workshop manager of the Cement Marketing Co., Ltd., did, and he has provisionally protected the idea. Taking the piston of an oil engine of normal design, in which four rings are used on the piston, a series of grooves, preferably five, is cut in the area above the topmost ring. These

grooves, which are spaced about in. apart, are 1/64 in. deep and 1/32 in. wide. Under working conditions they become filled with carbon, and this builds up until a series of ridges is formed.

Consequent upon the formation of the ridges, a number of intermediate voids is produced to cause a depression in the gas pressure. The combined effect of the ridges and the spaces is to protect the top piston ring from the direct effects of gas pressure and heat, with the important result that the ring is not robbed of essential lubricant.

Mr. Keeling, essentially a practical man, has already obtained figures and data which go to prove that his

grooved-piston idea is a definite step forward in the prevention of cylinderbore wear.

One example, quoted when dealing with the workshops of the Cement Marketing Co., Ltd., in our issue dated June 7, refers to an engine in which there was only 0.002 in. wear in the bores after 40,000 road miles. This engine was of 120-mm. bore.

In addition to this important result, it was found that there was practically no wear in the top-ring groove, as a ring of standard size fitted perfectly. Neither was the ring scored, scuffed or. burnt; it was removed in a perfectly lubricated condition, proving the protection afforded by the carbon-filled grooves.

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People: J. Keeling

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