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Old 04-14-2009, 02:04 PM   #1
unclemat
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Default Motor - drinks oil, blue smoke under boost - help!

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Last edited by unclemat; 11-23-2022 at 06:07 PM.
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Old 04-14-2009, 04:06 PM   #2
flycaster
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Your leakdown numbers are high for a freshly broken-in motor. Not terrible, but too high imo. The fact that the burn rate is getting worse, not better, is troubling. If I had to venture a wild guess, I'd say you have some cylinder glazing that took place during the first part of the ring seating process.

What kind of "built" lower end are we talking about here? Also, what P-SW clearance was used and what ring gaps were used?
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Old 04-14-2009, 04:20 PM   #3
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Old 04-14-2009, 04:47 PM   #4
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How'd the plugs look when you did the comp/leakdown test? Can you narrow it down to one cylinder?
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Old 04-14-2009, 04:53 PM   #5
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Old 04-14-2009, 05:01 PM   #6
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ever think or hear of valve seals going bad????? makes sense doesnt it? especially if you have steady and close compression and leakdown isnt off much.

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Old 04-14-2009, 05:02 PM   #7
unclemat
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Quote:
Originally Posted by hybridpatient95 View Post
ever thing of valve seals going bad?????
Yeah, but I understand the symptoms is smoke under deceleration... especially after lifting the throttle.
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Old 04-14-2009, 06:00 PM   #8
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Generally, blue smoke during hard acceleration indicates faulty oil control rings. While blue smoke during deceleration and on startup after the engine has been off for a while indicates faulty valve guide sealing either from leaking seals or excess guide clearance
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Old 04-14-2009, 06:12 PM   #9
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my car did the same thing...turbo seal was gone in a big way you could see oil pouring out around the center section clamp. but in your case thats jus odd...
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Old 04-14-2009, 06:28 PM   #10
mick_the_ginge
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Those plugs make it look like oil is getting into the combustion chamber. It it's not coming in the intake and it's not the turbo then it's got to be piston/rings or valves

Off subject but are those the right plugs for your heads? they look like they extend into the chamber more than I remember.
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Old 04-14-2009, 06:32 PM   #11
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Old 04-14-2009, 06:54 PM   #12
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I have the plugs that were in my motor from break-in to 3k miles right here and they all look like your #4.
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Old 04-14-2009, 07:14 PM   #13
john 1badSTI
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if you do a wet vs dry comp/leakdown it will tell you if its the rings are not seated properly.the percentages will get smaller(seal get better) when you squirt a little oil in the cylinder before the test if the rings are not sealing properly.I agree with mick those plugs look like a minute amount of oil is getting into the chamber.
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Old 04-14-2009, 08:53 PM   #14
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How is the 2nd ring installed? per CP instructions: 2. If the ring is a taper hook groove style, the groove
always goes down. (Figure 4) CP ring installation instructions If the groove is installed facing up it will pull oil into the combustion chamber.
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Old 04-14-2009, 09:08 PM   #15
oilguy
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it prolly has been said.

by most likely blow by rings not sized correctly or they were not set correctly, head do a leack down this will help you trouble shoot
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Old 04-14-2009, 09:19 PM   #16
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Old 04-14-2009, 09:27 PM   #17
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How did u break it in? stock rings or CP?
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Old 04-14-2009, 09:33 PM   #18
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Old 04-14-2009, 09:38 PM   #19
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Was it running rich at start up
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Old 04-14-2009, 09:41 PM   #20
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Old 04-14-2009, 10:03 PM   #21
bertune
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I usually break in a little hard in the early stages of a new build to get the rings seated early out. I guess to each his own. I built a motor some time ago and had the same problem u are having ( didn't smoke), i drove it for about two years and even ran 10's with it, but it eventually it got to me, filling it with oil every minute, so i rebuilt it. I was running stock rings.
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