Intake valve cleaning

[Lone Ridr]

Not meaning to start any negative discourse here, but "UPPER END" cleaning is not going to help with the valve buildup. The issue is that there is NO gas spraying on the back of the valves as the air enters the chamber like you would have in a carb or throttle body fuel delivery system. Nothing washes the back of the valve, since the fuel is injected directly into the cylinder. The catch cans are trying to take out the fuel and oil mist that can turn to carbon on the valves. This mist comes from the crank case and is returned to the motor to burn. It passes by the back of the intake valve where it bakes on. My 2 cents - won't argue if I get a nickle's change.

When the valves are opened by the camshaft they protrude into the cylinder. THAT is when the cleaning by additives takes place - in the cylinder. (Yeah, I know. I said I wouldn't comment to this thread any more........)

Sponsored

 

[JimKivi]

True, the valve opens, but it is the INTAKE valve that is the issue, and when that valve is open, the air is being sucked into the cylinder VERY quickly..... no way for any cleaning from the downstream fuel being squirted into the cylinder IMHO.