Fixed Orifice PCV System

On some early Toyota EFI vehicles, a fixed orifice PCV system is used to meter blowby from the crankcase into the intake manifold, where they would be consumed during normal engine operation. This system is simple in design and construction, and provides crankcase ventilation based on the size of the fixed orifice valves and the normal operating characteristics of intake manifold vacuum. The two fixed orifice valves are used to balance the strength of vacuum applied to the crankcase as engine operating conditions change. The biggest drawback of this type system is that blowby production does not always match intake manifold vacuum characteristics.

Orfice Pcv Valve

Was this article helpful?

0 0
Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook

Post a comment