Massive Oil Smoke on Decel - RX7Club.com - Mazda RX7 Forum

Single Turbo RX-7's Questions about all aspects of single turbo setups.

Massive Oil Smoke on Decel

Old 08-25-18, 05:19 PM
  #1  
Full Member
Thread Starter
iTrader: (3)
 
Ricebox's Avatar
 
Join Date: Nov 2016
Location: Palm Beach, Florida
Posts: 182
Thanks: 0
Thanked 13 Times in 11 Posts
Massive Oil Smoke on Decel

Hello guys, hoping someone can chime in and solve my problem.

when running higher speeds and rpm's, and letting off throttle, i get a plume of whitish smoke from the exhaust. this is during high vaccuum. it never happens in boost or at low speeds. turbo is a brand new journal bearing PTE 6266. i've vented the cranckase to a breather from the oil filler neck and from the rear turbo drain. i've also tried a few different oil restrictors on the turbo, as well as checked the turbo oil drain. am i missing a breather nipple somewhere? what could be causing this? engine runs great besides this issue, i don't get any smoke on startup or at any other time.

Thanks
Ricebox is offline  
Old 08-26-18, 06:32 AM
  #2  
Death to Infinite Scroll
 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 11,624
Thanked 37 Times in 34 Posts
Did it specifically start with the turbo?

The symptom is typical of bad oil rings. Not having a functional PCV system makes this worse.
peejay is offline  
Old 08-26-18, 04:50 PM
  #3  
Full Member
Thread Starter
iTrader: (3)
 
Ricebox's Avatar
 
Join Date: Nov 2016
Location: Palm Beach, Florida
Posts: 182
Thanks: 0
Thanked 13 Times in 11 Posts
Originally Posted by peejay View Post
Did it specifically start with the turbo?

The symptom is typical of bad oil rings. Not having a functional PCV system makes this worse.
it did start with this new turbo and V mount setup. car had a S366 on it when i purchased it and it never smoked. but the turbo is brand new, so i automatically ruled out it being that. i called precision and they told me i had a crankcase venting problem. dont really know what to do from here. very annoying. iíve got the crankcase vented with -10AN lines in the 2 locations people recommend.

Last edited by Ricebox; 08-26-18 at 04:59 PM.
Ricebox is offline  
Old 08-26-18, 10:44 PM
  #4  
Death to Infinite Scroll
 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 11,624
Thanked 37 Times in 34 Posts
"The turbo is brand new so I automatically ruled that out".

NEW stands for "Never Ever Worked". Never rule out new parts, new parts are untested parts.

peejay is offline  
Old 08-27-18, 07:22 AM
  #5  
Full Member
Thread Starter
iTrader: (3)
 
Ricebox's Avatar
 
Join Date: Nov 2016
Location: Palm Beach, Florida
Posts: 182
Thanks: 0
Thanked 13 Times in 11 Posts
Originally Posted by peejay View Post
"The turbo is brand new so I automatically ruled that out".

NEW stands for "Never Ever Worked". Never rule out new parts, new parts are untested parts.
next step is going to be replacing the turbo. been wanting to upgrade to the Gen 2 BB unit anyways. however my first assumption is that the turbo is new and thus my problem is elsewhere.


Ricebox is offline  
Old 08-27-18, 10:10 AM
  #6  
Rotary Enthusiast
 
Join Date: Jan 2005
Location: hsv al
Posts: 828
Thanked 7 Times in 6 Posts
Post up your catch can set up.

Which fitting did you use on the oil neck?

One caused a lot of smoke in vacuum, and one didn't as i recall.
Gilgamesh is offline  
Old 08-27-18, 11:48 AM
  #7  
Death to Infinite Scroll
 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 11,624
Thanked 37 Times in 34 Posts
Originally Posted by Gilgamesh View Post
Post up your catch can set up.

Which fitting did you use on the oil neck?

One caused a lot of smoke in vacuum, and one didn't as i recall.
If FD asis the same as older engines, vacuum goes to the filler neck and fresh air goes to the port on the intermediate housing right near the filler neck. Oil splashes from the rotors onto that port so it must only be treated as a crankcase airflow inlet.
peejay is offline  
Old 08-27-18, 12:18 PM
  #8  
Full Member
Thread Starter
iTrader: (3)
 
Ricebox's Avatar
 
Join Date: Nov 2016
Location: Palm Beach, Florida
Posts: 182
Thanks: 0
Thanked 13 Times in 11 Posts
Originally Posted by Gilgamesh View Post
Post up your catch can set up.

Which fitting did you use on the oil neck?

One caused a lot of smoke in vacuum, and one didn't as i recall.
I have a 95í so the lower nipple at the base of the oil filler on the middle iron is not there. but i have a -8AN line from the filler neck to the breather can, and also another -8AN line from the factory rear turbo drain to the same catch can.

oil level hasnt moved since ive been having this issue either

also: there is zero shaft play in the turbo and zero oil resedue anywhere in the charge piping


Last edited by Ricebox; 08-27-18 at 01:58 PM.
Ricebox is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
radkins
3rd Generation Specific (1993-2002)
6
09-03-09 11:10 AM
davesan1
3rd Generation Specific (1993-2002)
6
07-24-08 11:40 AM
mono4lamar
3rd Generation Specific (1993-2002)
45
08-21-07 07:45 AM
Bambam7
2nd Generation Specific (1986-1992)
10
08-27-03 03:23 PM
dtrigg
2nd Generation Specific (1986-1992)
0
05-07-03 08:33 PM


Thread Tools
Search this Thread
Quick Reply: Massive Oil Smoke on Decel


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: