When does the intake valve reach its maximum lift?
The intake valve reaches its maximum lift at some defined point (usually about 106 degrees) after top dead center. This is called the intake centerline, which refers to where the cam has been installed in the engine in relation to the crankshaft. This is commonly called “degreeing”. We will talk about this later also.
When to close exhaust valve and intake valve?
Once the piston passes through Top Dead Center and starts back down, the intake charge is being pulled in quickly so the exhaust valve must close at precisely the right point after the top to keep any burnt gas from reentering. This area around Top Dead Center with both valves open is referred to as “overlap”.
What’s the difference between the cam and the intake?
It makes no difference how you degree the cam in the engine, the lobe separation angle is ground into the cam. The intake centerline, on the other hand, is the position of the centerline, or peak lift point, of the intake lobe in relation to top dead center of the piston. This can be changed by “degreeing” the cam into the engine.
When does the exhaust valve open on a cam?
Since the camshaft turns at half of the speed of the crank, the power stroke only sees one fourth of a turn of the cam, or 90 camshaft degrees. As we move closer to the bottom of the cylinder, a little before the piston reaches the bottom, the exhaust valve begins to open.
How does the intake valve timing control work?
The Engine Control Module ( ECM) receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status.
What causes a Nissan intake valve to short?
P0011 NISSAN Possible Causes Low or Dirty Engine Oil Faulty Intake Valve Timing Control Solenoid Valve Intake Valve Timing Control Solenoid Valve harness is open or shorted Intake Valve Timing Control Solenoid Valve circuit poor electrical connection Faulty Camshaft Position Sensor Camshaft Position Sensor harness is open or shorted
What is the OBDII code for an intake valve?
OBDII Code List P0011 NISSAN P0011 NISSAN – Intake Valve Timing Control Performance Bank 1 Repair Importance Level: 3/3 Repair Difficulty Level: 3/3 Comments | Add Comment P0011 NISSAN Possible Causes Low or Dirty Engine Oil Faulty Intake Valve Timing Control Solenoid Valve
Once the piston passes through Top Dead Center and starts back down, the intake charge is being pulled in quickly so the exhaust valve must close at precisely the right point after the top to keep any burnt gas from reentering. This area around Top Dead Center with both valves open is referred to as “overlap”.