What is the one advantage of indirect port fuel injection vs direct fuel injection? in this video i'll show you one of the issue you get with direct fuel injection compared to non direct fuel injection.
With direct fuel injection, the fuel is injected directly into the combustion chamber, which has a number of advantages such as better fuel mixture due to the higher pressure, better fuel economy and increase in power.
The one disadvantage is that, in the conventional port injection engine, fuel is sprayed into the port or behind the valves, which keeps them clean and free from excessive carbon build up.
Now this carbon build up over time can cause a number of issues such as, reducing the volumetric efficiency or reducing the speed/volume of air that enters the engine. It can make the valves stick, so they don't close correctly which will cause a loss in compression and power. It can also cause premature wear to the valve seats and guides .
There are several companies out there who offer a carbon cleaning service which can be both positive and negative.
So where does the carbon come from? This carbon build up comes from the crankcase ventilation system, PCV This system vents the blow by gasses from the combustion back into the engine to be burnt again. Now the blow by gasses mix with the oil which forms this sticky carbon build up and then sticks to the inside of the inlet manifold and inlet valve.
One thing to check to ensue you minimise the carbon build up is your PCV valve of Air oil separator AOS If this isn't operating correctly the build up will accelerate and you will be burning a lot of oil.
Many people will fit an oil catch tank which is a great way to reduce the oil mist from going back into the engine.
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#injection
#fuel
#carbon
#direct
#PCV
#AOS
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