Measuri ng Compression Pressures
Page 44
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AMEANS for finding out the compression or combustion pressure in the cylinders of a petrol or oil engine is found in the Okill pressure indicator, which is made by George Taylor (Brass Founders), Ltd., All Saints Street Works, Bolton.
An example of its use is in arriving at the respective compression pressures in multi-cylindered oil engine. The indicator is directly connected, through a cock, to any convenient tapped hole in the-combustion chamber, and the fuel supply to the cylinder under test is cut off for a few strokes. Time will be saved if the indicator be first adjusted to the approximate pressure.
By use of the Okill indicator, a means is provided for adjusting the combustion pressures in the cylinders, fuel admission being regulated so that the peak-pressure reading in the respective cylinders is the same within narrow limits.
To obtain a reading, the only opera
tidn fifirolVeth •63 rotate the vulcanite head of the instrument, until the pointer at the side ceases to vibrate. The figures registered by the counter give a pressure reading in lb. per sq. in., or the equivalent in kg./cm.2 as desired.
Diagnosing Electrical Faults
KNOWN as the Pink Mouse, an automatic electrical fault-finder has been introduced by British Eagle Industries. Ltd., Omberstey Road, Birmingham, 12. It is claimed that it does not require the services of a skilled person to operate it and that wiring troubles can be diagnosed with great facility.
The accompanying illustration shows the compact nature of this equipment, the necessary electrical energy required for its use being obtained from the battery of the vehicle.
The price of the Pink Mouse is £37 .10s.