One of the biggest problems with direct injection is that the fuel is no longer being sprayed onto the backside of the intake valves.
This mist of gasoline actually helps keep the intake ports clean. In addition to fuel quality, he said things like valve and injection timing are key factors in carbon buildup.
In a direct injection engine, the fuel is vaporized directly into the cylinder. This leaves the air containing the other particles to pass over the hot intake valves and into the cylinder untouched. It seems those particles from the crankcase and exhaust recycling collect on the hot intake valves rather than pass into the cylinder to be burnt. Once this happens, the problem gets worse every time the engine is run and the deposits get larger. Where porting and polishing the intake improves performance, the carbon build up on the intake valves and surrounding ports does the complete opposite. Eventually the engine is starved of available air and performance at all levels is significantly reduced.
If your car engine has started to show signs of carbon build up, call us today to schedule an evaluation and a de-carbon service. Click here to get in touch with us.