Is CNG REALLY BAD FOR YOU ENGINE ?

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Is CNG REALLY BAD FOR YOU ENGINE ?

Many say CNG kills engines, I�d say we do the killing ourselves due to lack of proper care. Apparently, according to experts (NOT me), CNG serves to extend life of lubricating oil as CNG will not contaminate or dilute crankcase oil.
Fouling of plugs is eliminated and plug life is enhanced as CNG does not contain any lead. CNG enters the engine as gas while petrol comes in as spray or mist which washes down the lubricating oil from the piston ring area to raise the rate of engine depreciation. This reduces maintenance costs and engine life goes up. Now these are all scientific theories and I�ve seen several opened CNG engines that look fresh.
What you HAVE to watch out for is the extra heat generated that cause oils to break down over time. The advanced timing contributes to greater heat generation as far as I know.

Gari.pk User 8308 asked on 04 Sep 2010 14:33:26 pm

1 Answer

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Rayan - on 04 Sep 2010 14:33:46 pm

Yes you are right ,excessive heat is the only problem caused by the burning of the gas and roughly gas produce twice the heat comparing the gasoline.This excessive heat demages the valves and their seating and creates problem for those engine on which we cant manually adjust the the valve clearence and you know most of new engines are coming with the mechnisumn where (VVT-I or V-TECH etc) valves are self adjusting their position to give optimum power and fuel economy.

So for these engines while using CNG we have to overhaul the head with new valves(if required) after about 60 to 80 thousnad kilimeters.