1KZ breather question

Joined
Aug 5, 2016
Messages
26
Location
Vancouver, Canada
For the techies, can someone explain why the 1/2” breather tube on the 1KZ vents to the turbo inlet, rather than to the intake manifold (post IC) like the EGR.

What’s the benefit of compressing the blow-by gasses, gumming up the turbo and the intake?

My theory is that this facilitate gas removal because pressure in the turbo inlet is lower than under the valve cover, and thus creates suction.
 

GTSSportCoupe

2LTE abuser
Joined
Mar 23, 2012
Messages
6,527
Location
Victoria, BC, Canada
 
Because there is no boost before the turbo, but is boost after. If the breather was connected after the turbo, it would end up blowing air into the crank case and pressurizing it to whatever the boost pressure is. Probably would start popping out oil seals and the like.

The early diesels just vented the crank case to atmosphere. The reason they started feeding them into the intake is for emissions compliance.

Just get a catch can to remove the oil mist from the crank case fumes. You can still vent it to the intake if you like, or to atmosphere.
 
Joined
Aug 5, 2016
Messages
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Location
Vancouver, Canada
Thank you! I really should have thought of that myself since the answer was in my question. If pre-turbo location creates suction, post turbo would have pressurized the engine block. I guess it's not an issue for the EGR because the valve only opens at idle when turbo is not on?
 

GTSSportCoupe

2LTE abuser
Joined
Mar 23, 2012
Messages
6,527
Location
Victoria, BC, Canada
 
Thank you! I really should have thought of that myself since the answer was in my question. If pre-turbo location creates suction, post turbo would have pressurized the engine block. I guess it's not an issue for the EGR because the valve only opens at idle when turbo is not on?
Yes, I think you are right about the EGR.
 
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