oil burning smell after boost pull - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 05-19-2010, 04:14 PM   #1
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default oil burning smell after boost pull

I have recently started having a bit of an oil burning smell coming from the engine bay when I to a full boost pull. There are no leaks in the engine bay and AFAIK (before I turbocharged it) the engine didn't burn oil.

I'm thinking it may be turbo seals? Is there any way to test this other than looking into the piping?

There is also a small exhaust leak from mani to turbo, so if the engine burns a little bit of oil could the smell/exhaust gas be escaping from there?
falcon is offline   Reply With Quote
Old 05-19-2010, 04:25 PM   #2
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

If there isn't smoke coming out your tailpipe, it's not going to be your oil seal. Who knows, maybe your valve cover gasket is leaking a bit of oil, or your TPS o-ring, and it's getting hot and smelling.
dustinb is offline   Reply With Quote
Old 05-19-2010, 04:27 PM   #3
Elite Member
iTrader: (10)
 
Join Date: Oct 2008
Location: Seattle, Wa
Posts: 1,780
Total Cats: 30
Default

How is your PCV system set up?
Jeff_Ciesielski is offline   Reply With Quote
Old 05-19-2010, 04:54 PM   #4
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

Quote:
Originally Posted by Jeff_Ciesielski View Post
How is your PCV system set up?
And specifically tell us about your PCV valve. Sounds to me like you're pressurizing your crank case.
wayne_curr is offline   Reply With Quote
Old 05-19-2010, 05:24 PM   #5
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

Quote:
Originally Posted by dustinb View Post
If there isn't smoke coming out your tailpipe, it's not going to be your oil seal. Who knows, maybe your valve cover gasket is leaking a bit of oil, or your TPS o-ring, and it's getting hot and smelling.
No tailpipe smoke

Quote:
Originally Posted by Jeff_Ciesielski View Post
How is your PCV system set up?
PCV on the intake side is stock. The valve is only a week old as well

Exhaust side it's just laying open right now. So the crank case fumes are kinda pointing at the manifold.

Quote:
Originally Posted by wayne_curr View Post
And specifically tell us about your PCV valve. Sounds to me like you're pressurizing your crank case.
It only does it when it's under boost. If I do a hard pull keeping it under 0PSI it dosen't do it.

Should I vent the PCV on the intake side to a can then?
falcon is offline   Reply With Quote
Old 05-19-2010, 05:27 PM   #6
Elite Member
iTrader: (10)
 
Join Date: Oct 2008
Location: Seattle, Wa
Posts: 1,780
Total Cats: 30
Default

Quote:
Originally Posted by falcon View Post
No tailpipe smoke



PCV on the intake side is stock. The valve is only a week old as well

Exhaust side it's just laying open right now. So the crank case fumes are kinda pointing at the manifold.



It only does it when it's under boost. If I do a hard pull keeping it under 0PSI it dosen't do it.

Should I vent the PCV on the intake side to a can then?
Cap the port on the manifold (or fill it with JB weld) and gut/vent the PCV valve to atmosphere.
Jeff_Ciesielski is offline   Reply With Quote
Old 05-19-2010, 06:14 PM   #7
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

I'll block the port and vent the PCV and take it for a spin... see if it solves my problem.
falcon is offline   Reply With Quote
Old 05-19-2010, 06:26 PM   #8
Elite Member
iTrader: (10)
 
Join Date: Oct 2008
Location: Seattle, Wa
Posts: 1,780
Total Cats: 30
Default

Quote:
Originally Posted by falcon View Post
I'll block the port and vent the PCV and take it for a spin... see if it solves my problem.
I'm betting it will. Be warned though, if you try to use a cap long term, they will continually fail if you use cheap ones. The Napa cap that I have on mine seems to be holding up fairly well, but all of the schucks/orielly/autozone ones I put on there would balloon and pop after a while.
Jeff_Ciesielski is offline   Reply With Quote
Old 05-19-2010, 06:35 PM   #9
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

I'm running a catch can with a breather and that think reeks of hot oil after some boosted runs when the hood is popped OR when coming to a stop at a light with the windows/top down.
m2cupcar is offline   Reply With Quote
Old 05-19-2010, 07:00 PM   #10
Elite Member
iTrader: (13)
 
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 5,703
Total Cats: 237
Default

Hmm i have this exact issue. I am running a breather on the hot side valve cover port. Is a catch can the real answer then?

I was assuming it was the turbo on my car as well, because ive popped the hood shortly after a boosted run and could see what looked like oil vapor coming off of the turbo. And im still running the stock greddy drain line, which as you know sucks *****.
Fireindc is offline   Reply With Quote
Old 05-19-2010, 08:20 PM   #11
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

^^

I think it's the fumes burning on the exhaust that come out of the breather. I just picked up a circut sports catch tank locally for a great price.

Quote:
Originally Posted by Jeff_Ciesielski View Post
I'm betting it will. Be warned though, if you try to use a cap long term, they will continually fail if you use cheap ones. The Napa cap that I have on mine seems to be holding up fairly well, but all of the schucks/orielly/autozone ones I put on there would balloon and pop after a while.
I'm going to run a rubber one for now and keep a few spares in the car. I'm pulling my upper intake manifold shortly to tap some holes for more vaccum ports shortly. So I will drill/tap/insert bolt into that hole when I do.

I don't like running the ECU, FPR and boost gauge off the same vaccum port.
falcon is offline   Reply With Quote
Old 05-19-2010, 08:21 PM   #12
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

Quote:
Originally Posted by Fireindc View Post
And im still running the stock greddy drain line, which as you know sucks *****.
I just did my drain for the Greddy last week. Drilled tapped the pan and ran 5/8th fuel hose with heat sleeving. A good temp set up until my silicone drain hose arrives.
falcon is offline   Reply With Quote
Old 05-19-2010, 08:26 PM   #13
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

The fumes are vapor- and they smell like burnt oil. But the breather does get saturated with oil, so that oil may be getting on the manifold/turbo. My catch can is on the intake side and it still produces the burnt oil smell. AAMOF after a dozen consecutive boosted runs for tuning you could actually see the oil vapor "steaming" from the breather at the top of the catch can. This is primarily because my catch doesn't have anything in it for this vapor to condense on. It should. And then I should route the port the breather is on back to the intake tube pre-turbo - if I had one to route it too.
m2cupcar is offline   Reply With Quote
Old 05-19-2010, 09:02 PM   #14
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

I may do that. But right now it's just a filter. When I remove my PS I am going to run a downtube with a filter so I'll have a port to route it to.

And I remeber when I got the PCV valve I blew in it from both sides. One side was obvioulsy supposed to blow through easy but I could also blow a bit from the other side. So that makes me think that when under 10PSI of boost it is creeping a few pounds into the crank case. = no good.
falcon is offline   Reply With Quote
Old 05-20-2010, 08:17 AM   #15
Elite Member
iTrader: (13)
 
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 5,703
Total Cats: 237
Default

Thanks for the insight.

Falcon, you should just cap the Intake manifold port, hollow out your pcv valve, and run both to a catch can. I am doing this asap.
Fireindc is offline   Reply With Quote
Old 05-20-2010, 12:55 PM   #16
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

That's what I'm going to do, except I am going to tap the hole when I pull the valve cover and run two AN lines
falcon is offline   Reply With Quote
Old 05-20-2010, 01:41 PM   #17
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,479
Total Cats: 116
Default

My vented hood seems to suck all vapors out of the engine compartment and the smells get sucked into the fresh air cabin inlet at the base of the windshield on the passenger side. Have to run the heater controls on the recirculation on long steady climes to avoid smells. Under full load if you are vented to atmosphere you will get some smelly vapors out your vent which I believe is normal.

Also,
The baffle setup in the valve cover for the normal PCV hole doesn’t work as well as the intended vent port on the exhaust side. I’ve noticed on some tracks it will spew oil. High g left hand turn up hill under acceleration seemed to do that for me (turns 5 and 6 at Laguna)

Bob
bbundy is offline   Reply With Quote
Old 05-20-2010, 03:05 PM   #18
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,684
Total Cats: 1,562
Default

Run VC venting to a catch can with a filter to atmo. If you can't stand the vapor smells from underhood then run the other line out of the catch can under the car to a point under the back of the car to vent. I've seen it done before with success on several turbo cars. Just remember to empty the catch can periodically.
sixshooter is online now   Reply With Quote
Old 05-20-2010, 03:39 PM   #19
Elite Member
iTrader: (12)
 
Join Date: Sep 2007
Location: Charlotte, NC
Posts: 6,868
Total Cats: 66
Default

In my case, this smell was indeed coming from the turbo. It was cured by adding a oil restrictor.
Doppelgänger is offline   Reply With Quote
Old 05-20-2010, 06:45 PM   #20
Elite Member
Thread Starter
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

Picking up a can tommorow. We'll see how it goes.
falcon is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 04:35 AM.