The exhaust gas composition from a bench tested gasoline engine, driven by L. P. G., has been analysed by mass spectrometer on a wide range of loads. The following results are found: Propane, C
3H
8(0.03-0.16 mole%), Propylene, C
3H
6(0.04-0.25 mole%), Ethane, C
2H
6(0.02∼0.04 mole%), Carbon dioxide, CO
2(7.50-12.80 mole%), Carbon monoxide CO, (0.30-4.00 mole%), Oxygen O
2(0.80-5.00 mole%), Ethylene, C
2H
4, (0.03-0.05 mole%). It is also observed that the amount of carbon dioxide increases and those of hydrocarbons and carbon monoxide decrease with increasing number of revolution of the engine from 1, 000 r.p.m. to 2, 500 r.p.m., and they gradually approach to constant values in the range from 2, 500 r.p.m. to 3, 500 r.p.m.
These results agree with the values which are obtained by gas chromatography, calorimetry and Orsat's method.
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