Does an NGV engine run hotter than a gasoline engine?
There are several different factors at work that determine the exhaust temperature of an NG engine as compared to a similar engine running on petrol. NG engines that are converted from petrol operation do generally run with hotter exhausts. There are several reasons for this – one of the main ones being that with petrol there is a cooling effect as it evaporates in the induction system and in the cylinder. This does not happen with gas. Also a gas mixture tends to burn more slowly than petrol and so may still be burning when it is exhausting through the valves. There are several things that must be taken care of when doing a conversion – all important. The cooling system must be in good order and clean on the water side and the radiator clean on the air side. The engine ignition timing must be correctly adjusted (usually advanced) for gas – which tends to burn more slowly and you have to avoid gas still burning as it passes through the exhaust system. These are some of the important is
