How do you distinguish between a petrol engine and diesel engine?

Answer 1

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.

Answer 2

Advantages

Two stroke

1. High power to weight ratio
2. Less number of stroke per circle
3. Less moving parts eg no valve mechanism
4. High speed engine due to less moving parts
5. Low service and overhaul cost due to less number of parts

Four stroke

1. More torque even at idling speed
2. No scavenging problems
3. No fresh mixture escaping with exhaust gases

Disadvantages

Two stroke

1. Scavenging problem
2. Fresh mixture is escaping with exhaust gases during exhaust stroke
3. Non stable at idling speed

Four stroke

1. Low power to weight ratio
2. More moving parts,not suitable for high speed
3. More number of stroke per circle
4. High service and overhaul cost due to more parts

Answer 3

A 4 stroke petrol engine -uses a spark plug to ignite the fuel in the cylinder. A diesel engine simply compresses the fuel - which has a lower ignition point than petrol. The heat created when the fuel is compressed in the cylinder - is enough to cause it to ignite.

Answer 4

Two stroke diesel engine works the same as the petrol engine using ports rather then valves for inlet of air Detroit diesel made some nice big two stroke engines.check the 149 of DD.

Answer 5

The easiest way is to look for spark plugs. No plugs and it is a diesel, plugs and it is a petrol engine.

Answer 6

Yes, most diesel engines are 4 stroke.

Answer 7

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