TURBO HELP- oily explosion

[IxTech]

i just got my turbo build done and i go to do some half throttle-ish pulls to see how the top end felt. i had only rev'd up to maybe 4500 and it was doing great! but it threw the oil light. it was really strong and loud and not even tuned well. it fired right up on a 19lb+genIII maf miller war tune. running 8lbs of boost on my low comp stroker

anyway as i let out of 3rd at 6k there was a ton of smoke so i pulled over to see i have oil everywhere and it was gushing from somewhere i couldnt see in the low light. there was a good size puddle on the pavement. it looks like i had excessive oil pressure but im not sure why i would?

go to my build thread in the sig for pics...maybe something will stand out. it runs fine still btw.

thanks for any help!



:cockbloc:

[nando]

oil pressure relief valve?

you left the RWD valve in. the ix pump flows in reverse, and also has one built into the pump. I bet that valve doesn't like being flowed backwards.

either that or an oil cooler line popped loose? possibly filter housing?

[mattdk318i]

What crankcase vent are you using?

[nando]

heh, yeah that's a good one. if you left it connected to the TB like stock, that wouldn't be good..

[mattdk318i]

pressurizing the head and ultimately creating a oil pressure issue. Or it blew so much out of every orifice you became low on oil.

[IxTech]

oil pressure relief valve?

you left the RWD valve in. the ix pump flows in reverse, and also has one built into the pump. I bet that valve doesn't like being flowed backwards.

either that or an oil cooler line popped loose? possibly filter housing?

I think i removed the rwd one because i have that big hole like you said i would. and i am leaning toward an oil cooler line too. but i still need a way to decrease oil pressure.

What crankcase vent are you using?

the vent that goes from the crank up to the intake manifold? i could see how that could cause too much oil pressure.

but i was just one place im guessing because of how epic the discharge was.

heh, yeah that's a good one. if you left it connected to the TB like stock, that wouldn't be good..

please explain this a little more im not sure what vent we are talking about.


thanks for stepping in guys.

[nando]

the rubber vent tube goes from the valve cover to the throtte body. If you left that connected to the TB, the turbo will directly pressurize the crankcase at boost pressures. bad Juju. the TB port needs to be blocked off and the crankcase vented elsewhere.

[matias88e30]

Had same problem as you, the solution ^^^^ and a new oil cap

[einstein57]

:tsk:

[IxTech]

of course nando...i realized that after i posted. what is a good place to vent the valve cover?

thanks so much for the help guys! i just need to fix the leak now.

[Mr.SWISS]

the rubber vent tube goes from the valve cover to the throtte body. If you left that connected to the TB, the turbo will directly pressurize the crankcase at boost pressures. bad Juju. the TB port needs to be blocked off and the crankcase vented elsewhere.

Wouldn't the drainback tube be doing the same thing times 10? It's a much larger straight tube to the crankcase......

[z31maniac]

Wouldn't the drainback tube be doing the same thing times 10? It's a much larger straight tube to the crankcase......

Do you understand how turbo's work?

[Mr.SWISS]

Do you understand how turbo's work?

Do you know you are a doucher?

[Devil Inc]

Wouldn't the drainback tube be doing the same thing times 10? It's a much larger straight tube to the crankcase......

The drain tube for the head isn't connected to the actual air intake of the engine. It simply uses the manifold as a mounting point.

[blueapplesoda]

you can vent the vc to atmosphere, through a catch can, or in combination with:

a straight through exhaust, you could weld in a venturi system on the exhaust and just have it go out the tail pipe

the last place i would put it is in front of the turbo (compressor inlet). makes a mess inside the intact tract, lowers your fuel octane rating, but its effective for evacuating crankcase vapors