[V8] Crankcase ventilation-oil consumption related

[Tony and Lillie]

In addition to what Jason said, the crankcase ventilation system seems to 
have another flaw in it. When you accelerate hard the oil goes to the back 
of the head. On the drivers side, there is a vent right at the back, 
allowing oil to get sucked into the crankcase vent that way. That's the main 
area where Ingo and I have discussed putting a catch can of sorts. BTW, this 
seems to be more extreme on the manual cars, perhaps due to the extra 
acceleration ;-)

I have designed a "catch can" setup for the V8, and would love to build it. 
Perhaps in my spare time.......................

Tony

----- Original Message ----- 
Subject: Re: [V8] Spectral analysis V8 ABH and PT blocks


Bastian,
  Ingo is right about what I said.  I would change what you said a little 
and say that the vent system does not 'push' the oil into the intake, but 
rather the intake is allowed to 'suck' it in through these hoses.  I had 
once thought about re-routing some hoses to try to reduce the oil 
consumption - but it isn't that bad for me.  Whoever mentioned a catch can 
and drain to tank probably has the right idea - although you may be able to 
use a check valve or something, but I haven't looked at the system that 
carefully.  I have a PT and it uses oil, probably to the tune of 1qt in 
1000miles.  It has great compression, I haven't replaced the valve seals, 
but I did on my last PT and it didn't help one bit.  I also think that IF 
this problem gets worse with time or milage it could be due to sludge 
buildup in some passages, creating more vacuum or velocity in these 
restricted hoses - but that is just an off the wall theory.  I just think it 
is normal for these
 motors to use oil and I don't worry about it too much.