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the compression ratio of petrol engine is always less than
c.r. of deseal engine why?

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the compression ratio of petrol engine is always less than c.r. of deseal engine why?..

Petrol is not self igniting , it needs spark to flame up
in chamber. Where as diesel is self igniting in diesel
engine , to attain that state it requires high temp &
pressure .This temp & pressure is more than whats
required in Petrol Engines by property of that fluid .

 Is This Answer Correct ? 13 Yes 1 No

the compression ratio of petrol engine is always less than c.r. of deseal engine why?..

In order to avoid Knocking in petrol engine , c.r. kept low.

 Is This Answer Correct ? 0 Yes 0 No

the compression ratio of petrol engine is always less than c.r. of deseal engine why?..

because the self ignition temp of diesel is high.so the
comp ratio is high for diesel engines

 Is This Answer Correct ? 3 Yes 5 No

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