How Does The Vvt Work On The L76 Nbs

[jdolotina]

I am interested to know how the valves timing is changed in the engine. I always thought you had to have an overhead cam for vvt. I thought we just have the pushrod V8? Anyways, someone smarter than me could please explain?

 

Thanks, josh

[VMax2007]

I am interested to know how the valves timing is changed in the engine. I always thought you had to have an overhead cam for vvt. I thought we just have the pushrod V8? Anyways, someone smarter than me could please explain?

 

Thanks, josh

 

 

VVT on Cam-In-Block (aka Pushrod) engines simply phases the cam using hydraulic pressure from the engine oil controlled by a solenoid valve. It does not change the intake and exhaust timing independantly as it does in DOHC engines.

[jdolotina]

Do we have VVT on the intake and exhaust valves or just on the intake? I heard that is the difference between the 6.0 and the 6.2. That the 6.2 has it on the intake and exhaust and the 6.0 only has it on the intake.

 

Thanks, Josh

[VMax2007]

Do we have VVT on the intake and exhaust valves or just on the intake? I heard that is the difference between the 6.0 and the 6.2. That the 6.2 has it on the intake and exhaust and the 6.0 only has it on the intake.

 

Thanks, Josh

 

 

There is only one cam that controls ALL of the valves. The only thing VVT does is phase the cam relative to the crank. It cannot adjust the intake or the exhaust valves independantly or exclusively.

 

It advances or retards the cam timing based on engine rpms and load to optimize the power/efficiency of the engine. The computer sends a signal to a solenoid, which controls a hydraulic valve, then uses hydraulic pressure (engine oil) to rotate the cam relative to it's sprocket via a rotary vane. This advances/retards the timing accordingly. Make sense now?

[jdolotina]

got it thanks for the information.

 

Thanks, Josh