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Angry 930 smoking intermitently

I just bought a 1988 930 and have had some extensive work done it.
EFI, Carrera Manifold, AEM ECU, 3.4 litre upgrade, corillo rods, larger valves and several other things.
The car is smoking off and on and I am not sure what is the cause.
If it was constant, I would assume valve seals or rings. It runs clean at driving speeds but then smokes like mad at stop lights after it sits at idle for about 30 seconds.
The car has a k-29 turbo which I had rebuilt but I'm wondering if we may have missed something or the seals were damaged prior to the time we started messing with restrictors.
Car has 50k miles.
Any thoughts from any of you experts?
Thanks
Old 12-04-2008, 07:10 PM
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Max Sluiter
 
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Sounds like your turbo scavenge pump is not keeping up with oil flow.

Just my <$.02
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Old 12-04-2008, 07:22 PM
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make sure they put the 9mm ball bearing in the supply line to the turbo from the oil sender, it slows down the flow enough for the scavenge pump to work properly
Old 12-04-2008, 07:54 PM
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How long since the headwork was done? Exhaust valve guides are this motor's weak point and smoking at idle generally points to leaking stem guides. Do you have documentation on the headwork? Did they replace the guides? What type of guides? What type of stem seals?
I know it's easy to muff up the oiling on a Garrett but I think a K29 is a native oil-cooled turbo and should be compatible with our oiling system.
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Old 12-04-2008, 08:17 PM
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930 smoking intermitently............it's obviously stressed out
Old 12-04-2008, 09:24 PM
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Did you add cam oil restrictors (a common NA engine upgrade)?

Check the ball bearing first, then do a scavenge pump test: using a clear measuring cup full of oil. Drain turbo feed line into the cup, then run a tub up to scavenge pump. Run the engine, and watch the level. There is a thread on this.

You may also want to pull the intercooler, and see if there is any signs of oil on the intake side of the turbo. If so, the seals have blown.
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1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
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Old 12-04-2008, 10:40 PM
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Thank you for your replies.
I have pulled the scanvenge pump and it appears to be in perfect condition. It also keeps up when tested.

The k-29 was recently rebuilt but we did not start looking at restrictors until the smoke started. I've pulled the turbo and am sending back to the rebuilder for inspection. I'm hoping that this is the problem.

If it were valve seals or guides, wouldn't it smoke all the time?
Old 12-05-2008, 09:15 AM
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When you pulled the turbo was there oil in the intercooler or the turbo compressor housing? If so then likely the seals went bad.
If it were exhaust guides or intake guides your intercooler and turbo would be dry (relatively).
You did not overfill the oil tank and suck oil into the intake assuming this was the first thing you checked.

Good luck.
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Old 12-05-2008, 09:48 AM
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Quote:
Originally Posted by AngM018 View Post
Did you add cam oil restrictors (a common NA engine upgrade)?

Check the ball bearing first, then do a scavenge pump test: using a clear measuring cup full of oil. Drain turbo feed line into the cup, then run a tub up to scavenge pump. Run the engine, and watch the level. There is a thread on this.

You may also want to pull the intercooler, and see if there is any signs of oil on the intake side of the turbo. If so, the seals have blown.
On another note:
Is it bad practice to install the later cam line restrictors in the 930 engine?
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Old 12-05-2008, 09:49 AM
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Also, it should be noted that the restrictors WERE adjusted/tested with a cup to check the scavange operation, but not till it was observed that it was smoking and this AFTER the the brand newly rebuilt turbo installed. Its assumed that the turbo may not have seated correctly while over pressure condition without the restrictors. We are not sure. Any oppinions/experience?
I am a relative to thread starter.
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Old 12-05-2008, 10:28 AM
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Quote:
Originally Posted by fredmeister View Post
On another note:
Is it bad practice to install the later cam line restrictors in the 930 engine?
They became OEM on the 965 motor.
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Old 12-05-2008, 10:32 AM
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I installed the cam restrictors on my car, and every time it got warmed up (oil thinned), I started crop dusting. I pulled them, and have never had an issue since. Just my personal experience
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1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
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06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 12-05-2008, 11:35 AM
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I'm going to look closer later but I think there was some oil in the compressor side. That would be good news really. I'm hoping to avoid engine and valve work.
Old 12-05-2008, 12:06 PM
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Well mine is a 1983 930, and my intercooler always has a drop or two of oil resting in the pressure tube "O" ring connection leading into the intercooler. However, the car never smokes at idle or under any driving condition, only an very occasional 1/2 second puff at start up. I'm under the impression that this is normal stuff.
Abnormal engine oil smoke stuff is..smoke under deceleration= valve guides/top end, smoke under load/acceleration = rings, smoke at idle=seals.
Please correct me if I'm wrong!
Mark
Old 12-05-2008, 02:08 PM
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smoke on start up is normal with flat boxer type engines like ours. Even the 2008's still smoke on start up after sitting for a while. Oil will seep past the rings.
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1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 12-05-2008, 02:34 PM
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I pulled the k29 and sent to a rebuilder in Florida. Will hopefully learn more this week.
Old 12-08-2008, 08:13 AM
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UtahRuf,

Did you ever determine the cause of the smoking? My '88 930 has exactly the same symptoms, and I was curious if you found the cause.

Thanks
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Old 10-08-2009, 01:47 PM
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Quote:
Originally Posted by fredmeister View Post
On another note:
Is it bad practice to install the later cam line restrictors in the 930 engine?
OMG - big time....
Old 10-08-2009, 04:53 PM
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Wo ist die Rennstrecke?
 
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Quote:
Originally Posted by AngM018 View Post
smoke on start up is normal with flat boxer type engines like ours. Even the 2008's still smoke on start up after sitting for a while. Oil will seep past the rings.
It's normal on these motors that have OEM pistons & cylinders, specifically since everything is aluminum and grows (into spec) as heat builds.
Old 10-08-2009, 04:59 PM
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In regards to cam restrictors...

I installed them on my 87 930 and am quite pleased. Oil pressure is up 15psi across the board... These things were standard equipment in later turbo's...

I read all of the threads on these, seems there are 2 camps on this...
Old 10-08-2009, 05:03 PM
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Old 10-08-2009, 05:03 PM
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