Working cycle of CNG engine??

It works as normal four stroke engine.
Compression ratio can be reached up to 10.5:1
Consider it as a petrol engine but instead of petrol, CNG is used, just like in the engines that uses LPG as fuel.

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Originally Posted by shatriya

It works as normal four stroke engine.
Compression ratio can be reached up to 10.5:1
Consider it as a petrol engine but instead of petrol, CNG is used, just like in the engines that uses LPG as fuel.

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I just want ask whether CNG engine works on OTTO cycle,diesel cycle or any other cycle?? :

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Originally Posted by ashish_sinha

I just want ask whether CNG engine works on OTTO cycle,diesel cycle or any other cycle???????????:

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As I said, it works same as the petrol engine, and petrol engine works on Otto cycle, so this must follow the same.
But CNG can be used in Otto-cycle (gasoline) and modified Diesel cycle engines both. Lean-burn Otto-cycle engines can achieve higher thermal efficiencies when compared with stoichiometric Otto-cycle engines at the expense of higher NOx and hydrocarbon emissions. Electronically-controlled stoichiometric engines offer the lowest emissions across the board and the highest possible power output, especially when combined with exhaust gas recirculation, turbocharging and intercooling, and three-way catalytic converters, but suffer in terms of heat rejection and fuel consumption. A suitably designed natural gas engine may have a higher output compared with a petrol engine because the octane number of natural gas is higher than that of petrol as this would allow for an engine design with a higher compression ratio.

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Originally Posted by shatriya

As I said, it works same as the petrol engine, and petrol engine works on Otto cycle, so this must follow the same.
But CNG can be used in Otto-cycle (gasoline) and modified Diesel cycle engines both. Lean-burn Otto-cycle engines can achieve higher thermal efficiencies when compared with stoichiometric Otto-cycle engines at the expense of higher NOx and hydrocarbon emissions. Electronically-controlled stoichiometric engines offer the lowest emissions across the board and the highest possible power output, especially when combined with exhaust gas recirculation, turbocharging and intercooling, and three-way catalytic converters, but suffer in terms of heat rejection and fuel consumption. A suitably designed natural gas engine may have a higher output compared with a petrol engine because the octane number of natural gas is higher than that of petrol as this would allow for an engine design with a higher compression ratio.

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I think you are right,, but I'm not pritty sure about that,,
But anyway thanks-a-lot,,
Would you like 2 telll me what is the modification is done on petrol and diesel engine so that it can work with CNG,,

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Originally Posted by ashish_sinha

I think u r right,,,,, but i m not pritty sure about that,,,,
but anyways thanks-a-lot,,,,,,,,
would u like 2 telll me what is the modification is done on petrol n diesel engine so that it can work with CNG,,,

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It is same as it is done for LPG fuel in petrol engine.