Modern Engine Management Systems & Pro-Ma Performance Products
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About 50 years ago, the driver of a petrol-engined vehicle was able to manage all the controls of the engine. He could advance or retard the ignition timing for starting and extra performance. If he didn’t retard the ignition before hand cranking, he risked a broken arm! He could operate a manual choke to enrich the mixture for cold starting, and had a hand throttle to maintain a set engine speed at will.
As time progressed, cars were no longer supplied with crank handles. Next spark advance was controlled by vacuum and/or mechanical advance with the vacuum advance responding to engine load, and the mechanical advance reacting to engine speed. Next, automatic chokes replaced manual control, and throttles disappeared as the automatic choke was fitted with fast idle cams to match engine speed to choke plate position during the warm-up phase.
In recent years we have seen the introduction of electronic ignition, computer controlled ignition, fuel injection has replaced the carburetor/s and now we have full engine management systems.
Unleaded fuel and catalytic converters were introduced into the United States in 1975 and in Australia on new passenger vehicles manufactured from January 1986 as mandatory equipment. What are the benefits of all these new-fangled gadgets? Are they really an improvement? Are they really necessary? Let’s look at the individual benefits that are claimed for these changes:
l Electronic ignition has greatly improved ignition reliability, and resulted in the elimination of ignition points and condenser, along with the necessity to be regularly adjusting and replacing points and resetting ignition timing.
Once set, it does not need to be adjusted until there is significant timing chain or gear wear. This eliminates a major cost component in engine tuning. Ignition coil output has risen from 15,000 volt to 50,000+ volts to improve ignition particularly in “lean-burn” engines.
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