89 Breather hose

cre · 12-21-2009, 04:27 AM

Sigh... old 1960's musclecar thinking.

I haven't the patience to get into this one... think vacuum in the crankcase instead of positive pressure... think oil stick not popping out and oil coming out of the shaft.... think longer lived seals, a better seal of the piston rings, less water vapor and fuel contaminating your oil and so on. The only time a PCV system is a bad thing on a modern car is if it is clogged.

Before, when the system didn't use vacuum to clear the crankcase it was a take it or leave it kind of thing... made no rel appreciable difference if the gasses were routed to the intake or the atmosphere. What made the difference was the ventilation aperture.

Go to a drag strip or performance meet... most of the cars you will see still have the PCV system intact and often have the hose/piping upgraded and a catch can added to capture oil vapor.

There are more details as far as why to leave it... some of it I don't care to write out and some of it I can't remember at the moment. Just like the charcoal canister and evap controlled fuel tanks and valved fuel caps there are more benefits than just emissions.

And Haynes really stinks as a publisher... so much bad and/or incomplete info in every one of their books.

12-21-2009, 04:27 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Sigh... old 1960's musclecar thinking. I haven't the patience to get into this one... think vacuum in the crankcase instead of positive pressure... think oil stick not popping out and oil coming out of the shaft.... think longer lived seals, a better seal of the piston rings, less water vapor and fuel contaminating your oil and so on. The only time a PCV system is a bad thing on a modern car is if it is clogged. Before, when the system didn't use vacuum to clear the crankcase it was a take it or leave it kind of thing... made no rel appreciable difference if the gasses were routed to the intake or the atmosphere. What made the difference was the ventilation aperture. Go to a drag strip or performance meet... most of the cars you will see still have the PCV system intact and often have the hose/piping upgraded and a catch can added to capture oil vapor. There are more details as far as why to leave it... some of it I don't care to write out and some of it I can't remember at the moment. Just like the charcoal canister and evap controlled fuel tanks and valved fuel caps there are more benefits than just emissions. And Haynes really stinks as a publisher... so much bad and/or incomplete info in every one of their books. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->