A diesel engine is an internal combustion engine that uses compression ignition to ignite the fuel as it is injected into the engine.
DIESEL ENGINES VS. GASOLINE ENGINES
It is helpful to an understanding of how diesel engines work to compare the differences between a diesel engine and a gasoline engine. The main differences between a gasoline engine and a diesel engine are:
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A gasoline engine takes a mixture of gas and air, compresses it, and ignites the mixture with a spark. A diesel engine takes air, compresses it, and then injects fuel into the compressed air. The heat of the compressed air ignites the fuel spontaneously. A diesel engine does not contain a spark plug.
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A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency.
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Gasoline engines generally use either carburetion, in which the air and fuel are mixed long before the air enters the cylinder, or port fuel injection, in which the fuel is injected just prior to the intake stroke (outside the cylinder). In a gasoline engine, therefore, all of the fuel is loaded into the cylinder during the intake stroke and then compressed. The compression of the fuel/air mixture limits the compression ratio of the engine - if it compresses the air too much, the fuel/air mixture spontaneously ignites and causes knocking. Diesel engines use direct fuel injection i.e. diesel fuel is injected directly into the cylinder. A diesel engine compresses only air, so the compression ratio can be much higher. The higher the compression ratio, the more power generated.
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Diesel fuel injectors, unlike gasoline injectors, must be able to withstand the temperature and pressure inside the cylinder and still deliver the fuel in a fine mist. To ensure that the mist is evenly distributed throughout the cylinder, some diesel engines are equipped with special induction valves or pre-combustion chambers. Newer diesel engines are equipped with high-pressure common rail fuel systems. See Diesel Fuel System Basics for more information on this type of fuel system.
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Diesel engines may be equipped with a glow plug. When a diesel engine is cold, the compression process may not raise the air temperature high enough to ignite the fuel. The glow plug is an electrically heated wire that facilitates fuel ignition when the engine is cold. Glow plugs are typically found on small diesel engines. Gasoline engines do not require glow plugs as they do not rely on spontaneous combustion.
Welder Generators: What You Need To Know
Why have one when you can have two? A welder generator appeals to the value-seeker in every one of us. But it doesn’t stop there – with manufacturers packing even more tools into a generator unit, we can now get more bang for our buck than ever before.
Here, we reveal what you need to know about these multi-tasking powerhouses…
What is a Welder Generator?
A welder generator creates power for welding without reliance on mains electricity. Simply fill up the fuel tank, just as you would for a regular generator, and the welder generator will power your welding equipment wherever you need it. As a result, welder generators have become essential equipment for constructions sites, farms, industry and more.
Can I use a welder generator as a generator?
Sure can! One of the biggest advantages of a welder generator is that it can be used as a stand-alone generator. This saves you space, money and hassle in running two separate machines. So when you aren’t using the machine for welding, you can use the generator power for work lights, emergency power or to run power tools. You can plug tools and appliances directly into its outlets as normal.
What else can a welder generator do?
Advances in manufacturing means you can now get 2-in-1, 3-in-1 and even 4-in-1 machines (known as ‘workstation generators’). Take the Crommelins 7kVA 3 in 1 workstation – it houses a welder, generator and battery charger in one powerful yet surprisingly compact unit. The welder generator delivers a maximum output of 5600 watts together with 60-180 amp welding capacity and 12 – 24V battery charger. There are also 4-in-1 options with everything you could need for a demanding jobsite; that is, a generator, welder, compressor and batter charger. Isn’t technology great?
The most common choice of welder generator is the conventional model such as the Gentech 7kVA Welder Generator Powered by Honda. This is our best seller for farmers, tradies and serious DIY’ers who just want a tough, reliable welder generator unit. The other popular welder generator model is the Powerlite 7kVA Welder Generator, also powered by Honda.
Air-Cooled Engines
All engines are
air-cooled, but some, like the two-cyle engines in your chainsaw and leaf blower, pass their heat directly into the air, while others, like the engine in your Studebaker, give up their heat to a liquid coolant, which releases it into the air through a heat exchanger--the radiator.
But to keep things simple, we use the term "air-cooled" to describe any engine without water jackets in the block (and head, if applicable), and "water-cooled or liquid-cooled" to describe engines with a cooling system that circulates liquid.