Improvement of Cold Startability Running on M85 Spark Ignition Engine

Cold startability is one problem common to methanol vehicles because of methanol's low volatility. This study describes two necessary conditions for cold starting at -30°C: installing a cold start injector in the intake manifold and raising the Reid Vapor Pressure to 75.5 kPa. The cold start injector atomizes fuel to a 90- μ m average diameter in the intake ports and improves the mixture distribution at a temperature as cold as -30°C. Moreover, accomplishing cold starting requires that the indicated mean effective pressure of 686 kPa and above must be sustained until fast idling is reached.