ENGINE WARMUP with PRESENT-DAY FUELS and ENGINES

Present-day engines vary appreciably in their warmup performance with any given fuel.

Mechanical deterioration of an engine through use tends to impair its original warmup performance.

Volatility of fuels affects the warmup performance of any engine. The average 65% point measures warmup ability of a fuel fairly well.

The increased amounts of high-boiling, high-octane gasoline fractions available from refining equipment installed during the war may be expected to lower the volatility of gasoline. Automobile manufacturers should give this fact due consideration in designing future engines.