Carl Byck

I blew something on the dyno yesterday. Huge amounts of smoke. Turbo, or motor let go at ~6000 rpm every thing else was perfect. What is the best way to tell quickly, and without huge amounts of dis-assembly what failed? Specifics are on the single turbo forum, under "the good, the bad, and the ugly" LOL Thanks, Carl

Carl Byck

SEARCH, Dumb ***.

There, I did it for myself, Is it true if there is no oil in the IC pipes it is the engine?

Carl Byck

There is a 1/4 cup of Mobil1 in the first IC pipe after the turbo, is that definitive?

SPOautos

no matter if its the engine or turbo you'll be pulling that turbo off....when you pull it off drop the manifold and look for oil in the exh ports and manifold runners.

If you have that much oil in your IC pipes I'd lean more toward the turbo. Grab the nut on the compressor wheel and push it side to side and front to back and see if there is a lot of slop in it. If the turbo went bad and is blowing that much oil I'd imagine there is a bunch of slop.

Do you have a catch can? Was there anything in it?

Carl Byck

Stephen, the turbo has some side play, little to no end play. New catch can, not a drop, so plenty of ventilation I suppose. Carl

SPOautos

Does it currently have enough side play to touch the housing? Thats a lot of oil for there to be no major shaft play. Make sure your turbo has a 360degree thrust bearing...if it doesnt it wont live under the stress that you'll be putting on it. It HAS to have a 360degree.....matter of fact I thought that was your problem (thrust bearing went out) but with no major end play movement I dont think thats the case.

Maybe they just installed the wrong type of rings.

I guess I'd pull the turbo of but before shipping it back you might want to take a good light and look for oil in the exhaust port. I really dont think thats the problem though

BTW - if you have a qt of oil in your intercooler pipes you should probably remove and flush out your IC core. Its probably got a lot of oil in it.

Stephen

Jodeny

iTrader: (3)

If it's the oil control rings you'll usually get A LOT of crankcase pressure, the dipstick will probably blow out of the tube.
John

Carl Byck

Not a Quart, a 1/4 cup. Dip stick could not blow out, it sits sort of under the IC pipe. I will be pulling the turbo over the next couple days. All Precision turbios use a 360 degree bearing so far as I know. I bought this turbo for my Supra, so 30 psi was an expecte boot level, I was at half that, and at only ~6000 rpm. We never went over~7200 rpm, since we were just doing some base line tuning... When move the compressor side to side there is the sound of the oil suction, and release, kinda like pulling your boot out of the mud.

cewrx7r1

iTrader: (2)

I had a Hayes rebuilt that burned 1qt oil every 500 miles but no real smoke. It was not the turbo, no oil on them.

Usually a bad tubo seal causes much smoke and oil will be on the compressor or turbine blades.