Where is the easiest place for cars to accumulate carbon?

Car carbon deposition is mainly concentrated in two places, one is the intake valve and the other is the combustion chamber carbon deposition.

The first type: carbon deposit on the intake valve

What meets the high temperature of the engine is gasoline attached to the intake valve. At this time, hydrocarbons, paraffin wax and colloid that are not completely burned in gasoline will form colloidal carbon.

The second type: carbon deposition in the combustion chamber

As we all know, the power of the engine comes from the mixed gas, and the path of the mixed gas entering is first through the intake valve and then to the combustion chamber. At this time, the colloid and hydrocarbon in gasoline components will produce tiny carbon particles after explosion, which will not be discharged with the exhaust gas, but will form accumulation in the combustion chamber or attach to the muffler pipe.