Burning oil? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-22-2013, 08:24 PM
Proud LOSER
 
Last photo:
Join Date: Mar 2008
Location: Ottawa
Posts: 1,589
Wiki Edits: 0

Thanks: 39
Thanked 213 Times in 181 Posts
Burning oil?

OK, so as it says, I'm burning oil, at idle its fine, no smoke or anything, same as start up, all good there. But under accel its smoking, blue smoke, def oil. It runs fine. But I'm concerend. Checked pcv, it is baffled and on the rear pass cover.
I lent my leakdown tester to a buddy who is away for a few weeks so I don't have access to one currently. I spoke to the previous owner and he swears it wasn't using oil at all. But he never really drove it. It had a sealed valve cover on the drivers side until i bought it and put a breather in. The motor is fresh, less the 1000 miles on it. Could it have been hurt running without the breather? It was assemnled 2 years ago then sat parked for the most part. Could that effect anything? Do vortec heads have the same difficulty sealing intake gaskets internally? What things can I look for to try and diagnose for now?
The motor is
383, eagle rotating, KB pistons
Vortec heads with some bowl work and clean up
Performer RPM cam 234/244 @.050
488/510
Air gap intake (summit version)
Summit 750VC Carb
Long tubes
HEI
Oh and I just installed a timing double roller chain and removed a noisy gear drive. It went on fine, but i can actually hear the chain when its running. It has an billet cover and have been told they make everything sound louder?
Could I have possibly screwed anything up there that could cause the oil burning issue?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-22-2013, 08:35 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,212
Wiki Edits: 326

Thanks: 598
Thanked 760 Times in 650 Posts
Quote:
Originally Posted by bygddy View Post
I spoke to the previous owner and he swears it wasn't using oil at all.
What did you expect him to tell you, the truth?

When L31 heads and aftermarket cam are mentioned in the same post, I begin wondering about whether or not the builder actually prepared the heads for more lift or not. I'd be pulling a spring off an intake valve to inspect the seal and see if it's been smashed into submission by the underside of the retainer or not.

No. 2 possibility....oil rings not installed correctly.

No. 3 possibility....intake manifold not sealed to head ports, motor sucking in oily vapor from crankcase on intake stroke.

Last edited by techinspector1; 06-22-2013 at 08:44 PM.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-22-2013, 09:12 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 595 Times in 545 Posts
You can get some idea of whether a valve guide seal isn't sealing by first marking a sparkplug w/a sharpie while still installed in the head so you know the orientation of it in the head. Once you pull the plug, look at the center porcelain to see if there are oily deposits on one side only. If there is, look to see what valve it's pointing to.

A leaky intake gasket would be high on my list too.
Reply With Quote Quick reply to this message
The Following User Says Thank You to cobalt327 For This Useful Post:
vinniekq2 (06-22-2013)
  #4 (permalink)  
Old 06-22-2013, 09:26 PM
Proud LOSER
 
Last photo:
Join Date: Mar 2008
Location: Ottawa
Posts: 1,589
Wiki Edits: 0

Thanks: 39
Thanked 213 Times in 181 Posts
Quote:
Originally Posted by techinspector1 View Post
What did you expect him to tell you, the truth?

When L31 heads and aftermarket cam are mentioned in the same post, I begin wondering about whether or not the builder actually prepared the heads for more lift or not. I'd be pulling a spring off an intake valve to inspect the seal and see if it's been smashed into submission by the underside of the retainer or not.

No. 2 possibility....oil rings not installed correctly.

No. 3 possibility....intake manifold not sealed to head ports, motor sucking in oily vapor from crankcase on intake stroke.
They are summit racing heads, and had an additional bill from the machine shop for porting after initial porting.

I wasn't sure if the vortec style intakes were at the same risk for gasket issues as a standard style intake. Is there anyway to accurately test this before i break out the sawzall to try and the dist and intake out? It really doesn't look like much fun in an S10 lol.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-22-2013, 10:49 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,212
Wiki Edits: 326

Thanks: 598
Thanked 760 Times in 650 Posts
Quote:
Originally Posted by bygddy View Post
I wasn't sure if the vortec style intakes were at the same risk for gasket issues as a standard style intake. Is there anyway to accurately test this before i break out the sawzall to try and the dist and intake out? It really doesn't look like much fun in an S10 lol.
Any overhead valve V engine is subject to sealing, or not sealing, in the same manner.

I haven't thought much about how to detect gasket gaps at the head/manifold interface. What if you introduced a thick smoke into the crankcase through the oil dipstick tube and cycled the motor over slowly by hand with a socket on the crank bolt? Seems that if you took all the spark plugs out, the cylinder(s) that is (are) oiling would emit smoke from the spark plug holes. Yes? No?

I'll bet the majority of motors out there are not sealed up like they should be because it isn't something that we have been paying attention to.

Last edited by techinspector1; 06-22-2013 at 10:56 PM.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-22-2013, 11:43 PM
Proud LOSER
 
Last photo:
Join Date: Mar 2008
Location: Ottawa
Posts: 1,589
Wiki Edits: 0

Thanks: 39
Thanked 213 Times in 181 Posts
Quote:
Originally Posted by techinspector1 View Post
Any overhead valve V engine is subject to sealing, or not sealing, in the same manner.

I haven't thought much about how to detect gasket gaps at the head/manifold interface. What if you introduced a thick smoke into the crankcase through the oil dipstick tube and cycled the motor over slowly by hand with a socket on the crank bolt? Seems that if you took all the spark plugs out, the cylinder(s) that is (are) oiling would emit smoke from the spark plug holes. Yes? No?

I'll bet the majority of motors out there are not sealed up like they should be because it isn't something that we have been paying attention to.
That sounds like it might make sense. I guess I will bring it to work Monday, we do have a smoke machine there.
Was hoping it was just valve seals lol.
Thanks for the input Richard
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-23-2013, 01:03 AM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,212
Wiki Edits: 326

Thanks: 598
Thanked 760 Times in 650 Posts
Another thought I had was to bolt on a block-off plate to replace the carbutetor. The plate would be drilled, tapped and fitted with a Schraeder valve (tubeless tire valve). Back off all valves so that all combustion chambers are tight. Low-pressure (5 psi) smoke could be admitted to the intake and seen coming out the oil dipstick tube if there was a leak from the manifold to the crankcase.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-23-2013, 03:39 PM
Proud LOSER
 
Last photo:
Join Date: Mar 2008
Location: Ottawa
Posts: 1,589
Wiki Edits: 0

Thanks: 39
Thanked 213 Times in 181 Posts
Quote:
Originally Posted by techinspector1 View Post
Another thought I had was to bolt on a block-off plate to replace the carbutetor. The plate would be drilled, tapped and fitted with a Schraeder valve (tubeless tire valve). Back off all valves so that all combustion chambers are tight. Low-pressure (5 psi) smoke could be admitted to the intake and seen coming out the oil dipstick tube if there was a leak from the manifold to the crankcase.
That might be something simple I can put together at the shop this week. I was out today in it, and had wife behind me, at cruising speeds, or gentle accel from a stop its fine, zero trace of smoke, but anytime I lean on it hard, or even hit it hard while idling in park, as soon as I lift off the throttle there's smoke, 2 seconds later its gone again. So would that rule out rings or valve seals in your opinion? After really taking a look at it today yes, its got a very slight blue tinge to it, but its more grey smoke then anything. I'm almost wondering if its Carb related more then oil. The fuel guage sending unit in the cell was gummed up with stuff and wouldntbread until I took it apart and cleaned it, it sat a long long time with stabalizer in the fuel, and I'm wondering if some residue is in the Carb causing issues.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 06-23-2013, 04:19 PM
Proud LOSER
 
Last photo:
Join Date: Mar 2008
Location: Ottawa
Posts: 1,589
Wiki Edits: 0

Thanks: 39
Thanked 213 Times in 181 Posts
Small edit here, running with the breather and pcv off, no smoke from the valve covers at all, at any rpm. And backing it into the garage, I noticed it is smoking at idle, but grey black more then anything, hopefully all this stressing is for nothing and its all Carb related. Will try another one this week and see what i have.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Burning Oil mrSeandiddy Engine 4 06-16-2009 11:03 AM
Oil blowby/oil burning waltnardo Engine 7 03-24-2008 10:43 PM
burning oil davidwobken Engine 1 10-25-2005 11:24 AM
Oil Burning 35olds Engine 3 08-09-2005 07:29 PM
Burning Oil... HELP iiiezekieliii Engine 3 06-25-2003 09:31 PM


All times are GMT -6. The time now is 03:09 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.