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What is the typical compression ratio and combustion chamber pressure in a compression ignition engine?
Typical compression ratios between 18:1 and 23:1 are common, although in an effort to minimize oxides of N2 compressions as low as 16:1 are being employed generally resulting in a loss of 1-2 mpg resulting from the lower thermodynamic efficiency of the diesel cycle. Higher compression ratio yield higher thermodymic efficiency relative to the ideal or Carnot thermodynamic cycle.
I'm not sure who answered this but you are way off. 18:1 on up is for engines that run on Diesel or a variation of a bio-fuel. Gasoline engines are typically 8:1 on up to about 11:1 on the newer engines with coil on plug coils which can have over 80.000 volts per cyl. Thus alowing the variable valve timing and great mpg even on a large engine.
The gentleman asked about a compression ignition engine, which is a diesel engine. The rebuttal about an 8:1 would be for a spark ignition engine. I believe that the 1st answer was correct (Otto & Diesel would be upset). As for the pressure of the diesel/compression combustion, You could look on online commercials for piezo electric transducers to see what ranges they use to measure engine pressures during combustion in engine testing (food for thought).
What else can I help you with?
What happens during the compression stroke in an internal combustion engine?
During the compression stroke in an internal combustion engine, the piston moves upward, compressing the air-fuel mixture in the combustion chamber. This compression increases the pressure and temperature of the mixture, preparing it for ignition.
What is SI engine and CI engine?
An SI engine is a spark ignition engine. A CI engine is a compression ignition engine. SI engines use spark plugs to ignite fuel in the combustion chamber. CI engines use compression in the combustion chamber to ignite the fuel.
What is the average temperature inside the combustion chamber of an internal combustion diesel engine?
the air temp at the end of the compression stroke for the ignition of diesel fuel within the combustion chamber is approx between 450*c - 675*c Brent
What are si and ci engines?
SI engine means Spark Ignition Engine where combustion products(air,fuel)are ignited in combustion chamber by means of spark from spark plug which is located on cylinder head..CI engine means Compression Ignition Engine,here combustion is take place by means of compression..
Why must the charge in combustion chamber be compressed before ignition?
Compressing the charge in the combustion chamber increases its temperature, which makes it easier to ignite. A higher compression ratio generates more power and efficiency in the engine by ensuring a more complete combustion of the fuel-air mixture. Additionally, compression helps to create a stable flame front for consistent and efficient combustion.
Compression ratio of the internal combustion engine is defined as?
The compression ratio of an internal-combustion engine, or an IC engine as it is more commonly called, is the ratio of the volume the highest capacity of the combustion chamber to its lowest capacity. In the IC engine, the piston makes a stroke, resulting in the compression of the air in the combustion chamber - the ratio between the volume of the cylinder and combustion chamber when the piston is at the bottom of its stroke, and the volume of the combustion chamber when the piston is at the top of its stroke, is the compression ratio.
What is the problem if the combustion chamber is not properly sealed?
that would be a compression problem.
What does chamber volume mean in a engine?
The chamber volume refers to the compression ratio of the external combustion of the engine.
What happens to the piston and the gases during compression stroke?
During the compression stroke in an engine, the piston moves upward, compressing the air-fuel mixture in the combustion chamber. This compression increases the pressure and temperature of the gases, making them more volatile and ready for combustion when the spark plug ignites the mixture.
Secondary compression in the two-stroke engine occurs in the?
combustion chamber area
What causes detonation in a combustion chamber?
Increased combustion chambers temps or too much ignition advance.
During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber?
This is called the compression stage. During the four stroke sycle (Otto cycle) the four stokes are induction, compression, power and exhaust. Each piston does this in a set order to even out the stresses caused, and thereby smooth the output. For example the firing order (i.e. power stroke) on a four cylinder engine could be 1,3,4 and 2 or 1,2,4 and 3.
