Answer / rupesh_c

Compression Ignition is used in Diesel engine and Spark ignition is used in petrol engine,So if petrol is used to run diesel engine there is improper combustion of fuel and may cause knocking

Answer / rahul

diesel's self ignition temp is lesser than petrol's
so to raise the temp. of that respective fuel they employ two techniques
1: increasing the pressure
2:directly increasing the the temperature by sparkplugs
and hence petrols self ignition temp is high they employ both in petrol engine.. but comparatively diesel engines self ignition temperature will be high..
when perol is poured into the diesel engine it will not ignite... bcoz it wont reach its self ignition temperature...
thank you

Answer / srinivas

Usually diesel will have high compression than petrol engine so it may leads to knocking.

Answer / nikhilesh

Petrol and Diesel are very different fuels. Petrol is much lighter than Diesel, evaporates easily, is less oily. Typically it is C9H20.
          Diesel in contrast is much heavier, evaporates very slowly, is much oily. It is typically C14H30. It is less volatile than Petrol.
          Diesel is ignited by compressing the air to a very small volume. This heats the air up. The diesel is then sprayed and combustion starts. There is no spark plug in a diesel engine.
          Whereas petrol is ignited by a spark (that's what a spark plug does). In a petrol engine, the air and petrol are mixed beforehand and are then injected into the combustion chamber and compression follows. The spark plug is then triggered to initiate combustion.
          In a Diesel engine only the air is sucked in and compressed. At this high pressure, diesel is sprayed in. Now if you put diesel in a petrol engine, the mixing will not be good (because diesel is not as volatile and will not form droplets and vapors as easily as petrol, in fact diesel is fairly viscous) and the spark plug cannot initiate combustion. 
          Further the auto ignition temperature of petrol is about 300 deg C and the temperature after compression in diesel engine is about 700 deg C which is higher than petrol, making it tougher to burn. It has a higher flash point. The Flash point is the lowest temperature at which it can vaporize to form an ignitable mixture with air.  The flash point of Petrol is -43 deg C and that of Diesel is 52 deg C.
          Above all the engine faces detonation (knocking) problems when petrol is made to run in a diesel one due to its high compression ratio(9:1 to 10:1 for petrol engine & 14:1 and 22:1 for a diesel engine).

Answer / avnish kumar

it would permanently damage the engine component so you
should never run the diesel engine with petrol however you
can run run a diesel engine with 40% or less petrol mixture
with the rest diesel.

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