got a big problem - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 08-21-2007, 10:12 PM   #1
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default got a big problem

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
what miata? is offline   Reply With Quote
Old 08-21-2007, 10:41 PM   #2
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

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.
magnamx-5 is offline   Reply With Quote
Old 08-21-2007, 11:00 PM   #3
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default

yea ill try it hot but usually the results are better... and there near perfect
what miata? is offline   Reply With Quote
Old 08-21-2007, 11:32 PM   #4
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

what's your PCV routing look like?
Arkmage is offline   Reply With Quote
Old 08-22-2007, 02:19 AM   #5
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default

not running a pcv. 180 on all cylinders compression test no blow by
what miata? is offline   Reply With Quote
Old 08-22-2007, 09:20 AM   #6
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Quote:
Originally Posted by what miata? View Post
not running a pcv. 180 on all cylinders compression test no blow by
Crankcase open to atmosphere? What did you do with the lines off the valve cover?
olderguy is offline   Reply With Quote
Old 08-23-2007, 02:36 AM   #7
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default

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?
what miata? is offline   Reply With Quote
Old 08-23-2007, 09:27 AM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

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?
Braineack is offline   Reply With Quote
Old 08-23-2007, 10:04 AM   #9
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

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.
magnamx-5 is offline   Reply With Quote
Old 08-23-2007, 02:37 PM   #10
Newb
 
Join Date: Mar 2007
Location: The Sham, Ga
Posts: 5
Total Cats: 0
Default Oil Problem

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?
Dewalt is offline   Reply With Quote
Old 08-23-2007, 02:43 PM   #11
I'm Miserable!
iTrader: (1)
 
Join Date: Oct 2005
Location: Columbia, SC
Posts: 858
Total Cats: 0
Default

Quote:
Originally Posted by Dewalt View Post
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
lol wow holy crap yeah turn that thing around (which is called "clocking" btw). That will 100% no doubt make smoke.
SloS13 is offline   Reply With Quote
Old 08-23-2007, 02:44 PM   #12
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

Quote:
Originally Posted by Dewalt View Post
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.



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.
Braineack is offline   Reply With Quote
Old 08-23-2007, 02:55 PM   #13
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
(within 10 from vertical)
fixed it for ya
Arkmage is offline   Reply With Quote
Old 08-23-2007, 02:58 PM   #14
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

yya ya ya.
Braineack is offline   Reply With Quote
Old 08-23-2007, 05:28 PM   #15
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

wow yeah most 16g's are in a bad spot until they are clocked (rotated) GL man.
magnamx-5 is offline   Reply With Quote
Old 08-23-2007, 10:41 PM   #16
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default

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
what miata? is offline   Reply With Quote
Old 08-23-2007, 10:58 PM   #17
Senior Member
iTrader: (3)
 
Join Date: Apr 2007
Location: Odenton, MD
Posts: 713
Total Cats: 0
Default

it pressurizes the crank...IE BAD. just do it and stop being an smart ***.
Dow.tom is offline   Reply With Quote
Old 08-23-2007, 11:44 PM   #18
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default

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
what miata? is offline   Reply With Quote
Old 08-23-2007, 11:45 PM   #19
Senior Member
iTrader: (3)
 
Join Date: Apr 2007
Location: Odenton, MD
Posts: 713
Total Cats: 0
Default

no, removing the PCV pressurizes the crank. re route it the the pipe from your Airfilter that connects to the turbo.
Dow.tom is offline   Reply With Quote
Old 08-23-2007, 11:52 PM   #20
Junior Member
Thread Starter
 
Join Date: Nov 2006
Posts: 158
Total Cats: 0
Default

Quote:
Originally Posted by Dow.tom View Post
it pressurizes the crank...IE BAD. just do it and stop being an smart ***.
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.
what miata? is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
New M62 Miata owner Pist0n Meet and Greet 4 10-01-2015 09:18 PM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:58 PM.