what miata?

well here it goes...... i just threw on the turbo set up everything went great on the install did ms extra, t25, front mount the whole deal. also changed almost every seal on the engine. i go to start it up and its burning oil like crazy! i change the turbo same disconnected the drain to make sure it was flowing with the car running that was fine. im running a small enough line, with the re stricter on the turbo. change the turbo with i know was good with another one same. i notice when i pulled the turbo mani it seems like its burning the oil before the turbo int the combustion chamber. pulled the spark plugs all of them full of oil ****! so i did a compression test dry 185 in all OK. did a leak down test 100/96, 100/96, 100/92, 100/96 and that was cold! WTF what the hell is wrong, i check the water and no sign of oil. so im guessing the head gasket is fine, to have all plugs full of oil like that and not be in the watter i kinda ruled out the head gasket and no leaks around the engine. the only thing i can think of is valve seals, but why so much i never seen valve seals leak so much. also i check the charge pipes and no oil so im like 90% sure its not the turbo.

i mean i work at a shop i see things alot but this seemed weird to me. im not a miata guru so im ask the miata community.

shoot me ideas or what you think or if it has happend to you.

im rulling out valve seals but i never seen it this bad.....

thank for reading my small book lol

magnamx-5

iTrader: (7)

i had a bad turbo do that but you already ruled that out. Maybe try a hot test for leak down. The oil has to be comming from somewhere, turbo is the obvius choice. Pistons/HG is the next past that nothing else would do that i think valve seals would not be that dramatic i think. + they should show up on a leak down test. Try a hot test to see if it is related to expanded parts and age.

what miata?

yea ill try it hot but usually the results are better... and there near perfect

Arkmage

iTrader: (3)

what's your PCV routing look like?

what miata?

not running a pcv. 180 on all cylinders compression test no blow by

olderguy

iTrader: (19)

Crankcase open to atmosphere? What did you do with the lines off the valve cover?

what miata?

just left them open and plug ed the one on the intake mani. so i have no vacuums leaks any where. i think im just gonna yank the head get all new valve seals clean he up and slap her on and hope for the best.....

any other thoughts before i start to take the car all apart?

Braineack

iTrader: (62)

its obvious with your leakdown, it's not the valve seals....so why the hell would you rip the head off....

why dont you put your pcv line back....

so you just started it up and it started smoking instantly? or did you drive around and notice the turbo smoking? or the tailpipe dumping smoke? Did you get the thign a chance to burn off all the residual oil/gunk after installing?

magnamx-5

iTrader: (7)

this all could be helped if we knew how much smoke you are getting as well. for me and the way i saw what you presented it is a significant amount. IE you cant drive down the raod without being a spy hunter with a deployed smoke screen, I have been through that not fun. If you have less than this it is quite possible you have nothing wrong and just abunch of dirt etc to burn off the inside of the combustion chamber.

Dewalt

I am still new to turbo charging my miata. I have a similar problem that you are having, I am almost sure on why this is happening with mine. The only difference is that you are running a t25 and I am running a 16g. Now my “guess” is that the way my turbo is sitting on the top of the manifold which is putting my oil feed line and oil return in a bad position. The oil feed line is almost at the bottom of the turbo at an angle and oil return is on the top but I am hoping that I can take the turbo apart and rotate the center peace (not sure what this is called) around to reverse this. In theory the oil being forced up into the turbo is backing up when the turbo is at low oil pressure or idle and causing it to leak past the seals and go into the Ic pipes and exhaust. Or it could be leaking on high pressure and im not seeing this until im at idle or low rpms. This may be all wrong but im going to give it a try and see how it works. If anyone can shed some light on this I would be grateful?

SloS13

iTrader: (1)

lol wow holy crap yeah turn that thing around (which is called "clocking" btw). That will 100% no doubt make smoke.

Braineack

iTrader: (62)

that's the problem....and yes you can rotate the CHRA....


the oil feed may have pressure...however the return doesnt....so the oil you are pumping in is backing up and getting forced past your seals....rotate it back correctly (at least 10° from vertical) and your problem should go away.


btw, reattach the damn pcv.

Arkmage

iTrader: (3)

fixed it for ya

Braineack

iTrader: (62)

yya ya ya.

magnamx-5

iTrader: (7)

wow yeah most 16g's are in a bad spot until they are clocked (rotated) GL man.

what miata?

first of all my turbo cartridge is at the right position.......
second when you do a leak down your not testing your valve seals...
the valves car completely closed when do a leak down test....
when you do a leak down test you are testing for bad rings or valves......
valve seals are completely above the combustion chamber.

y should i reconnect the PCV?
explain y that would cause oil to get in the combustion chamber

Dow.tom

iTrader: (3)

it pressurizes the crank...IE BAD. just do it and stop being an smart ***.

what miata?

look man i not being a smart ***.... also did you just say the a leakdown test pressurizes the crank? if so just stop now! im looking for educated answers so you not helping too much.

and im not just going to do something with out a reason. i see no reason to put the pcv back on. if you think so give me a educated reason why. if anything i should run the pcv to the inlet of the turbo if you were to do it correctly i think it works of of vacuum and atmospheric nothing more. so my thought would be to run it to the inlet of the turbo. if im wrong educate me and explain thats what i thought forums are for

Dow.tom

iTrader: (3)

no, removing the PCV pressurizes the crank. re route it the the pipe from your Airfilter that connects to the turbo.

what miata?

sorry i miss read what you wrote... but how am i pressurizing the crankcase by venting it. i mean yes it would help a lil to have a vacuum to help release crankcase pressure but i dont think its the cause of my problem.