I want to know if a carbureted petrol engine is perfectly set on CNG, ie the air intake and the timing through the distributor, than how much lesser horse power the engine is going to produce than the original fuel?
Like in a land cruiser having 3F, 4000cc petrol engine with carburetor has the capability to produce 155HP. So if perfectly set on CNG, how much HP it will still be able to produce?