Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315



Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

While discussing PCV systems without a PCV valve: Technician A says that blowby gases are routed into the intake manifold through a fixed orifice tube. The system works the same as if it had a valve, except that the system is regulated only by the vacuum at the orifice and the size of the orifice. Technician B says that VVT systems eliminate the need for a PCV system. Who is correct?

a. Technician A only

b. Technician B only

c. Both A and B

d. Neither A nor B

To determine

The correct technician among A and B who are discussing the PCV systems without PCV valve.


A fixed orifice tube is the one which helps in blowing the gases into the intake manifold. Such fixed orifice tube is used sometimes in place of PCV valve in the engines comprising of PCV systems. These tubes resemble a PCV valve but with an exception of the flow control method, as in this, the flow is controlled by using the vacuum in the orifice. This implies that technician A is correct.

As in place of a PCV valve in the PCV system, the orifice tube can be used as a substitute...

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