RotaryMachineRx

iTrader: (1)

damn how did you even notice that? what were the symptoms? breather get soaked in oil?

Brettus

iTrader: (2)

Was trying to track down a boost leak and could hear the air bubbling in the oil pan . So I connected a hose up to the breather and ran it to inside the cabin to see if it was leaking through under boost .
Turned out it was .

olddragger

iTrader: (3)

Man I love grassroots diagnostic work like that. That was smart bret--kudos!

Chris

iTrader: (10)

crazy diagnostic testing brett

Turblown

How do you figure that is the turbo and not blow by in the engine?

Brettus

iTrader: (2)

Because it would pressurise the the pipe only under boost . I held my finger over the pipe as i drove along .
Normal cruise/idle/low load : nothing
under boost : a steady stream of air
and if i put my finger over the hole : it will build up pressure

Turblown

That just blow by. Replace your turbo/rebuild it, and re-test. Going to show the exact same thing.

RotaryMachineRx

iTrader: (1)

I still say this ^

Brettus

iTrader: (2)

Why would it only do it under boost ? I can cruise along at 5000 rpm and nothing . Surely if it was blowby air would leak out under all circumstances .

Turblown

Generally you only see blow by on turbo rotaries, unless an n/a engine was REALLY worn out. I've seen this on countless rotaries/pistons with undersized crankcase vents. I generally use at least 1 if not two -12AN vents. I've been on the dyno many many times with new turbos that will do exactly what you are talking about, as you can usually visually see the crankcase vent while on the dyno. Nothing comes out until you hit positive pressure, sometimes its A LOT. You also see oil pans start to leak, or leak a LOT worse when you put a turbo on these cars, which is blow by...

9krpmrx8

iTrader: (46)

The problems I was having with blow by was that it was only happening when it would go into boost. Even at only 1 psi (haven't gone over that really). I can drive around fine all day with no problems, but the minute I hit a hill and the load goes up and it gets into boost, it would sputter (oil going into the intake) and make a mess. Since I put a proper catch can on I have had not issues with that but I have to empty it pretty often. Obviously my increased blow by is due to my current setup but it does only do it under boost.

I will be so happy to get a proper turbo on this bad boy.

200.mph

iTrader: (9)

9k can you even consider your setup a greddy kit anymore? are you ever gonna finish it?

9krpmrx8

iTrader: (46)

It will never be finished 100% but when I get my turbo back from Turblown it will be pretty much done, there are just a few things I want to redo like duct work, etc. I can't wait, I'm psyched to be getting out for sure Saturday thanks to Shady's help.

I would like a different manifold eventually but I would like to see some results on one first.

Brettus

iTrader: (2)

hmmm - very interesting .

I actually did do another test that I thought confirmed the turbo leak theory .

Which was accelerate under part throttle ensuring no boost into manifold but up to 8-9psi at turbo . so 0 psi manifold - 8-9 psi at turbo . Under that scenario i saw the same amount of air leak out .
So : the amount of air was fairly consistent and seemed to have no bearing on how much was flowing through the engine or how much boost was at the UIM but seemed related to how much boost the turbo was actually making.

Brettus

iTrader: (2)

OK - I had to go do a retest to confirm what I was saying above.


I was completely surprised to find the amount of air leaking under boost now, is less than half what it was last time I checked it !!!!!!!
So what has changed since then :

The only thing I've done is an oil change !!!!!

TeamRX8

iTrader: (25)

put 20W50 in it then let us know the results

Brettus

iTrader: (2)

/\ are you serious ?

TeamRX8

iTrader: (25)

/\ very

olddragger

iTrader: (3)

and you can premix 1 1/2 oz a gallon and see if that makes a difference.

On my supercharger engine i get blow by if I am on track. I usually dont stay in boost long enough while street driving to get any. But if I dont put suction to my catch can I get a lot of the condensation people speak of no matter the oil temps. And what turblown has said is very true -- undersized vents. Not only is the vent undersized ( even for na) the pressure that is trying to vent has to make turns. That is why I need vacuum to my catch can to help remove the condensation. Thats the only thing I have found to work for me.
Heres a fun little test----have a buddy ride behind you and drive in boost with the oil dipstick out--he will be able to see oil smoke coming from out from under the car.
.

Chris

iTrader: (10)

whats going on my fellow greddy owners??

I am about to reconfigure the oil return line. Finally got the mustang (other car thats in my garage) out and back up to its owner in New Jersey (girlfriends dad) so I now have enough room to put the car up on stands for a few days.

I have a spare stock oil pan that I plan on having a new drain plug welded on. I want to place a drain plug either on the back end of the pan, so when I lift the front up for oil changes it drains out the back (science ) or place it on the same side but a few inches towards to the front of the pan. I found a good AN fitting that simply screws into the stock drain plug so it would be great for return.

... Thoughts my friends???

Brettus

iTrader: (2)

/\ I still use the stock drain plug for the oil return . It takes me an additional few seconds to do an oil change but not enough to make me want to weld a bung in .

Chris

iTrader: (10)

Simplicity

9krpmrx8

iTrader: (46)

I am redoing mine as well, I am thinking of going into the drain plug as well since I use an oil extractor to do oil changes anyway.

Rotaman

Turblown
If you are suggesting that the factory crankcase vent outlet is too small, and adding another one to the system would be beneficial, where do you suggest would be a good location to mount another vent outlet? For FI specifically.
Thanks

9krpmrx8

iTrader: (46)

You can cap the nipple on the oil fill tube, get an aluminum oil cap (Mazdaspeed) and then drill and tap it for a large fitting. That is what I am doing just to be cool.

This is for an LS motor, not sure if the threads are right for our oil filler tube.