الفهرس 
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Abstract
The present study has been conducted on a LADA-BA3-2106
engine for the concentrations of hydrocarbon and carbon.anoxide emitted from that engine under idling as well aspart-load conditions. The speed ranges of 600 to 1200 RPM forthe no-load conditions and 1200 to 2000 RPM for the part-load conditions have been investigated. Spark timing has been
varied between 20 BTDC to 10 ATDC. Concentrations of HC and
00 emissions have been measured by a portable infrared exhaust gas analyzer. Sample calculations of a mathematical
.udel have been compared to the experimental results. The present study shows that increasing engine speeds at no-load aad part-load conditions would decrease HC&CO exhaust
-.ission concpnt rati ans. Advanc i ng the spark timing at no load conditions would increase HC&CO exhaust emission
CDIlcentrations. Increasing coolant temperature under both
iiling and part-load conditions would decrease slightly HC&CO
eKhaust emission concentrations. Increasing engine speed at
-load conditions would decrease bLowby flow rate of engine.
lie blowby flow rate and the concentrations of unburned HC&CO
ia the engine blowby would decrease during the warm-up period.