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2.5 liter Petrol 8-1 diesel 25-1 compression
because a diesel engine ignites its fuel with pressure, and not with a spark like a petrol engine. that is why a petrol engine does not need as high a compression ratio as a diesel engine
Different engines - different ratios, but commonly around 8 to1.
yes.ok
No the compression in a Gasoline is only 8 to 1 in a Diesel it is 22 to 1 so it would blow up
The four strokes are intake, compression, combustion, exhaust.
Compression ratio is the difference in the volume of a engine cylinder between when the cylinder is at it's largest volume, compared against when the cylinder is at it's smallest volume. Gasoline engines use 8:1 to 12:1 compression ratio. Diesel fuel engines use 14:1 to 25:1.
As you don't give engine make and model , difficult to say. Possibly around 8- 1 comp.
Cylinder compression is not really something that has a definite number. All 8 cylinders should be relatively close to the same pressure. If it is REALLY HIGH, like 140 or above, there is a lot of carbon buildup. If it is really low, like below about 70, you may have bad rings. Check the compression and if it is low, squirt a little motor oil in each spark plug hole and check it again. If it goes up considerably, you have bad rings. If it stays the same, or close to it, the rings are good.
Cracked head or head gasket bad
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).
No..the compression ratio is much higher eg a small petrol engine will have a ratio of 8:1 where a diesel small engine has around 17:1..