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What point in the power stroke do most engines ignite the air fuel mixture?
Wiki User
∙ 6y ago
At the top of the compression stroke. That's the point at which the fuel/air mixture is under greatest pressure.
Wiki User
∙ 6y ago
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What does a diesel engine use to ignite the fuel with since it doesn't use a spark plug?
The fuel/air mixture in the cylinder is compressed to the point where it gets hot enough to self ignite.The fuel/air mixture in the cylinder is compressed to the point where it gets hot enough to self ignite.
Whats the difference between engines running on diesel and gasoline?
Gas engines use spark plugs to ignite the air fuel mixture and diesel engines use high cylinder compression to ignite the fuel air mixture. Other than that they are similar. <><><> Diesel engines ignite the fuel by using high compression: as the engine compresses the air inside the combustion chamber, it reaches around 1000 degrees, at which point diesel fuel is injected into the combustion chamber, and it ignites. Gasoline engines use the sparks from spark plugs to ignite the gasoline/air mixture in the engines' combustion chambers after it has been compressed. Because separate sparks are used the amount of compression required in a gasoline engine is a lot less than would be necessary in a diesel engine. The main reason diesel engines are heavier and more expensive to make than gasoline engines is because, to be able to withstand the much higher compression, diesel engines have to be made much stronger by having thicker cylinder walls, compression chambers, pistons, connecting rods, crankshafts, etc.
How do you distinguish between a petrol engine and diesel engine?
A diesel engine is an internal combustion engine which uses the heat of compression to ignite the fuel/air mixture in the third stroke of the 4-stroke cycle, while the petrol engine is an internal combustion engine which uses an electrically-generated spark system to do the ignition. Diesel engines have a higher efficiency compared to petrol engines. In simple terms this means diesel engines can give 50% or more miles per gallon than petrol engines.
What is the difference between four stroke petrol engine and that of diesel engine?
Petrol engines are sometimes also called constant volume engines. They suck in a combustible mixture of fuel and air, compress it and then ignite it with a spark plug. Combustion is so fast that (most of it) takes place while the volume of the compression chamber(in the cylinder, between piston and cylinder head) stays the same. Then, as the piston moves away from Top Dead Center (TDC) combustion is (mostly) done and the pressure begins to drop. Diesel engines are also called constant pressure engines. They take in air, compress it to the point where the temperature alone will ignite the fuel, and then they inject the fuel. And fuel keeps being injected and burned as the piston moves away from TDC, keeping the pressure, kinda-sorta constant through the combustion phase.
Is gasoline a pure or substance or a mixture?
Gasoline (also called petrol) is a mixture of many different complex hydrocarbon molecules that have a roughly similar boiling point. Commercial gasoline also has other substances added to it to improve its performance in internal combustion engines, or to reduce the pollution resulting from its use in those engines.,
What does 'Have a point' mean?
The flash point is the lowest temperature at which vapors of a liquid can ignite.
What is the minimum flashpoint?
The temperature at which point a flammable can ignite.
Why you dont use self detonation in petrol engines?
"Petrol", or gasoline, engines require a spark plug to ignite the fuel and air mixture to generate energy on the power stroke in a typical four stroke engine (Intake, Compression, Power, Exhaust). Diesel engines use what is sometimes called "compression ignition" to ignite the fuel air mixture on the power stroke. I'll assume by "self-detonation" you mean ignition by something other than a spark plug. Gasoline cannot be used in a diesel engine, nor can diesel fuel be used in a gasoline engine. Engine damage can occur in either scenario. Diesel fuel is less refined than gasoline so is more oily. This helps lubricate and cool the inside of the diesel combustion chamber that operates at much higher temperatures. In a gasoline engine, combustion temperatures are lower so the oil does not burn off and will cause excessive and heavy smoke. I'm not sure if gasoline would even work in a diesel engine because gasoline has a lower flash point than diesel and would ignite too soon and burn too fast in the diesel combustion chamber. Perhaps another, more knowledgeable, contributor could shed some light on that one. The bottom line is if the engine is "self-detonating", aka compression ignition, it would be a diesel engine not a "petrol engine". The engine cannot be both petrol and compression ignition - it just wouldn't work. Diesel engines have become better and better in recent years since automakers have put R&D money into projects, and VW now has the TDI diesel that is powerful, efficient, economical, and reliable.
What ignites diesel fuel in a diesel engine?
the glow plugs help, but mainly its spontaneous combustion. The fuel-air mixture is compressed to the point at which it autoignites note that diesel engines have higher compression ratios than gasoline engines
What is petrols melting point?
Because gasoline is a mixture of many different hydrocarbons from hexane to dodecane, there is no set melting point. The melting point for octane is about -57 degrees Celsius, and the melting point for heptane is -91 degrees Celsius.
Does multipoint fuel injection system engine need spark plug?
Yes it needs spark plugs, every type of enternal combustion engine needs something to ignite the compressed air/fuel mix in the cylinder, including diesel engines they use glow plugs that help heat the mix and have a rediculus compression ratio which heats the mixture to the point it will combust with very little help.
Why the cars which run on petrol cant be run with diesel?
Petrol engines use a spark plug to ignite the gasoline. Diesels on the other hand use compression to ignite the fuel. Diesel engines have a very high compression ratio that causes the fuel to ignite under pressure. Gasoline engine do not run near the compression as a diesel. Put diesel in a gasoline engine and it simply will not run. Reason being is that diesel fuel has a much higher flash point. Gasoline contains 4 to 12 carbon atoms, diesel has 10 to 20 carbon atoms and is much heavier than gasoline.
