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Pro-Ma Fuel and Oil Additives Performance Products for modern petrol-engined vehicles

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article image Pro-ma Fuel and Oil Additives note the changes in petrol-engined vehicles between now and 50 years ago

50 years ago, vehicles with petrol engines were a far cry from the those we see on our roads today. In recent years the automobile world has seen many changes and additions to petrol-engined vehicles including the introduction of electronic ignitions, fuel injection, unleaded fuel, catalytic converters, and engine management systems, but what are the benefits of all these new-fangled gadgets? 

Pro-ma Fuel and Oil Additives have taken an indepth look into the individual benefits that are claimed for these changes:

Electronic Ignitions
Electronic ignitions have improved ignition reliability, and eliminated ignition points and condenser, along with the necessity for regularly adjustment. Once the electronic ignition is set, it does not need to be adjusted until there is significant timing chain or gear wear. This eliminates the major costs involved in engine tuning.

Ignition coil output has risen from 15,000 volt to 50,000+ volts to improve the ignition particularly in “lean-burn” engines. However, the higher voltage places a bigger strain on ignition insulation, so engine cleanliness and the correct high tension leads are vital for radio and television interference, and to reduce the possibility of the high voltage tracking to ground instead of firing the spark plug correctly.

Fuel Injection
Fuel Injection has resulted in more power, economy and accurately controlled metering according to demand. Engines are fitted with one or two fuel injectors, or one per cylinder according to design. Fuel is pumped from the tank by an electric fuel pump. Fuel pressure is regulated by a pressure regulator, and the excess is returned to the tank for cooling, vapour and foam dispersion. At the correct point of crankshaft rotation, the computer activates and electrical solenoid in the injectors lifts a tapered needle off its seat, allowing fuel to be sprayed into the inlet manifold or port. The duration is measured in milliseconds, and when the current ceases, the injector closes.

Currently, to reduce cost, most fuel injectors are designed to inject into the manifold up to 75° before top dead centre, with the duration determining the volume required. Most six cylinder engine’s injectors spray singly or in sets of three once per crankshaft revolution depending whether there are two or six injectors.

Unleaded Fuel
Unleaded fuel has a lower octane rating than Super or Premium and when unleaded fuel engines are maintained they result in less atmospheric pollution. Leaded fuel engines relied on the lead in the fuel to provide a lubricant for valve seat and valve guide areas, as well as to provide some combustion chamber cleaning. Unleaded fuel engines require specially treated valves and seats to minimize valve seat wear, and they burn drier in the upper cylinder area. However should maintenance of the unleaded fuel engine be neglected they can create worse pollution than a leaded engine.

Catalytic Converters
Catalytic Converters are designed to process the exhaust gas to carbon dioxide and steam. However, to do so they need to have become heated to about 1,000°C by a combination of exhaust temperature and catalytic action. Until they reach this temperature, or if they cool down at traffic lights or travelling down hill, they may not process the exhaust completely and will emit H2S gas.

A couple of tankfulls of leaded fuel or a misfiring spark plug will cause major damage to catalytic converters, and result in overheating, and/or blockage.

Engine Management Systems
Engine management systems are able to control ignition timing, the correct quantity of fuel dispensed for all conceivable engine functions and to adjust ignition timing appropriately.

At the heart of the engine management system is a computer with a microprocessor receiving and sending signals from a number of sensors. These are in the form of voltage readings or pulses. Sensors are fitted to monitor engine R.P.M., manifold air pressure and temperature, intake air velocity, coolant temperature, detonation, throttle position, exhaust gas oxygen levels, and vehicle speed input.

All of these messages are collated and compared with the computer’s memory program. The memory contains a number of maps to cover most of the operating conditions likely to be encountered, and the computer then sends signals to all the relevant components and makes the necessary adjustments to result in optimal settings.

Pro-ma Fuel and Oil Additives Petrol Treatment should be used continually at the recommended dosages to keep fuel systems and injectors from becoming fouled. The Petrol Treatment  will also assist in extending spark plug, exhaust system and catalytic converter life, and reduce oil dilution.

The Pro-ma Fuel and Oil Additives Petrol Treatment PT5 should also be used for the life of a vehicle to maintain the engine as close to its new condition as possible, for better performance, reliability and economy.

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