Acura TSX / Honda Accord CL. Manual - part 564

 

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Acura TSX / Honda Accord CL. Manual - part 564

 

 

Fig. 46: VTEC/VTC Operation Chart 

Fig. 47: VTEC/VTC Description 

VTC system 

The VTC system makes continuous intake valve timing changes based on operating conditions. Intake valve 
timing is optimized to allow the engine to produce maximum power. 

Cam angle is advanced to obtain the EGR effect and reduce pumping loss. The intake valve is closed quickly to 
reduce the entry of the air/fuel mixture into the intake port and improve the charging effect. 

The system reduces the cam advance at idle, stabilizes combustion, and reduces engine speed. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

If a malfunction occurs, the VTC system control is disabled and the valve timing is fixed at the fully retarded 
position. 

Fig. 48: VTC System Intake Valve Timing Chart

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

Fig. 49: VTC System Intake Valve Timing 

VTEC system 

The VTEC system changes the cam profile to correspond to the engine speed. It maximizes torque at low 
engine speed and output at high engine speed. 

The low lift cam is used at low engine speeds, and the high lift cam is used at high engine speeds.

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

Fig. 50: Low Speed Valve Timing 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

 

 

 

 

 

 

 

Content   ..  562  563  564  565   ..