HIGH OCTANE PETROL
DAMAGING TO VALVES (0.C.) CHRISTCHURCH, this day. Damage is being done in a number of instances to exhaust valves and pistons of motor engines and is belived to be caused by the higher octane petrol being issued. The condition does not appear immediately but only after the petrol has been used in the engine for some time. The usual result is for the exhaust and occasionally other valves to become burnt out. In some instances, pitting of the cylinder linings and pistons has been reported. A method of overcoming the trouble was suggested by an official of the Transport Department. It had been tried by a number of operators and garages, he said, and as no further complaints had been received it seemed to be satisfactory. It was to add one quart of ehgine oil to 20 gallons of petrol. This supplied a certain amount of upper cylinder lubrication which reduced the heat generated by the higher octane rating. In addition, the valve clearances should be increased slightly and? the spark advanced as far as possible. The engine should be kept well tuned.
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Auckland Star, Volume LXXIV, Issue 272, 16 November 1943, Page 4
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186HIGH OCTANE PETROL Auckland Star, Volume LXXIV, Issue 272, 16 November 1943, Page 4
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