Can you please explain what is the problem could cause if the last strokes were absent?

Six stroke engine has following work 1:-suction 2:- compression 3:- ignition 4:-exhaust 5:-air suction again 6:-exhaust Actually those last two stroke is added in order to remove burnt gases which are little bit present after 4th stroke engine. When fresh air come and if there is already some amount of burnt gases already present then there will be prblm in combustion process and it also somehow affect the efficiency of the engine . This is the main reason behind the concept of six stroke engine.

Very nice picture to understand the types of engines, there is an another one type engine, whih is called as Opposite Piston engine, where it has one cylinder for Two pistons. here you can see the picture of opposite piston engine. Thank you Based on the fuel consumption there are few types like 1. Petrol engine 2. Diesel engine 3. Gas engine 4. Electrical engine Based on the Ignition process, there are two types they are, 1. Spark Ignition 2. Compression Igntion Based on the No of cylinders, 1. Single cylinder engine 2. Multi cylinder engine Based on No of strokes, there are three types 1. Two Stroke engine. 2. Four stroke engine. 3. Six Stroke engine.

Why the spark plug is located near exhaust valve ?

Why alcohol can't be used in diesel engine ?

What is the difference between scavanging and supereharging ?

How the octane number of fuel can be increased ?

What is equivalence ratio is regard to combustion of fuel ?

In what connection Wilson line and Willan's line used ?

What is fuel sensitivity ?

How the diesel engine knock can be reduced ?

What is the function of thermostat in cooling system of an engine ?

Which are the reference fuels for knock rating of S.I. engines ?

Why pistons are usually dished at top ?

How engine design needs to be changed to burn lean mixture ?

What is HUCR in relation to petrol engine ?

If cut of ratio of diesel cycle is increased, what happens to its efficiency ?

For the same compression ratio Otto cycle is more efficient than diesel engine.

For same compression ratio, whether Otto or diesel cycle is more efficient ?

What do you understand by time cylinder lubrication ?