LNF Leakdown test numbers

[Stretch2126]

Just seeing if anyone could share their numbers they got. I’m about 22-24% even across the board but this was also done on a cold engine. I know it’s not fantastic but I’m sure regular temp will help. Also I only hear air coming from the oil cap, so it blowby. I recently made a PCV delete setup so I can see the additional pressure pushing oil through the timing cover and turbo seals. Engine does not smoke at all or smell like oil while running. Looking at putting another breather on the oil cap.

 

[Gtstorey]

Have you checked compression also?

 

[Stretch2126]

Have you checked compression also?

Yep. I know my gauge is off cause it reads 175 but it’s 175 even across the board as well. That was last week. Only drove the car twice since.

 

[Stretch2126]

Also for context I’m running a zfr6758 and make about 350-370wheel.

 

[Desert Sasqwatch]

Just seeing if anyone could share their numbers they got. I’m about 22-24% even across the board but this was also done on a cold engine. I know it’s not fantastic but I’m sure regular temp will help. Also I only hear air coming from the oil cap, so it blowby. I recently made a PCV delete setup so I can see the additional pressure pushing oil through the timing cover and turbo seals. Engine does not smoke at all or smell like oil while running. Looking at putting another breather on the oil cap.

When you say PCV delete, you're talking about removing the valve from the intake manifold, plugging the open port, and adding an external PCV, correct? Not plugging the port (or installing the PCV backwards) will allow boost pressure into the crankcase that will blow out oil seals, like the timing cover and crankshaft mains. The PCV, and the hose from the back passenger side port on the valve cover to the port on the turbo housing, are there to remove excess crankcase pressure. Disabling one or both of these will cause high crankcase pressure and leakage similar or worse than what you're experiencing. Can you explain what configuration the 2 ports on the back side of the valve cover are (what they are connected to) and if the PCV is reconfigured to an external valve?

 

[Stretch2126]

When you say PCV delete, you're talking about removing the valve from the intake manifold, plugging the open port, and adding an external PCV, correct? Not plugging the port (or installing the PCV backwards) will allow boost pressure into the crankcase that will blow out oil seals, like the timing cover and crankshaft mains. The PCV, and the hose from the back passenger side port on the valve cover to the port on the turbo housing, are there to remove excess crankcase pressure. Disabling one or both of these will cause high crankcase pressure and leakage similar or worse than what you're experiencing. Can you explain what configuration the 2 ports on the back side of the valve cover are (what they are connected to) and if the PCV is reconfigured to an external valve?

I did a similar method of Powells v3 but with a catch can instead of a separator. The new line from the intake goes to a separator Tee’d with the dirty line from the valve cover > catch can> turbo inlet for vacuum. I read somewhere that it could provide enough vacuum but I guess not with an aftermarket turbo ?

 

[Stretch2126]

Just an update. Still pushing oil into the charge pipe and intercooler. Now I have everything closed as a PCV and just run a vent to atmosphere to rule out a bad catch can. It’s weird because the car still runs great and there is no smoke from the exhaust. The only issue is oil buildup in the inlet and charge pipes. Also the port in front of the inlet is capped as well so there is no outside variable. I might put my k04 back on this weekend to try to rule out a bad turbo.