Burning oil at start up when parked on an angle

[KarlGTB]

Ever since building my new engine 60,000kms ago occasionally on start up it has blown a big cloud of thick oily blue smoke. It usually only happens when the car is parked on a lean passenger side low. I never really worried about it and always thought it was just the forgies. Anyway I have recently moved house and my new street has quite deep gutters. Now its happening every start up and its quite noticeable when it engulfs people walking on the street etc.

I'm about to single turbo the car and want to get to the bottom of it beforehand. Its a bg5b with the ej20r rebuilt with JE's and ACL bearings, otherwise all genuine bits and stock twin turbo set up. I haven't had the intercooler off yet but there's oil around the primary turbo, bov and return hose. There's quite a bit on top of the head on that side as well, it almost looks like its been leaking out the bov. It happens cold or warm, sometimes after only 15 mins or so with the engine off. Once running it clears within 10-15 seconds but I usually get a bit more as I drive off. After that no smoke whatsoever, on load or over run as far as I can tell. I do have a slight low rpm miss but its fine on boost/load. At the moment I'm hoping its the primary turbo oil seal but also thinking stuffed piston ring or valve stem seals.

Any thoughts?

[KwS]

Out of curiosity, does it smoke at high RPM/boost too? My old forged GTB did the same thing, park on an angle and it would smoke like a train on start up. It also smoked at high rpm/boost though, think it was ring/bore issues.

[KarlGTB]

I haven't noticed anything when giving it the jandal but maybe I'll try getting someone to follow me and watch. Damn really don't want to have to build another motor just yet. How long did yours last for like that?

I am wondering whether my low rpm miss could be due to low compression on a cylinder which could be the culprit for the oil.

If there was excessive blow by then I would have thought it would smoke all the time.

If the valve stem seals are gone wouldn't you normally see it on over run or when you accelerate afterwards?

I guess I should compression test it. If that's OK and the primary isn't stuffed, I'll just assume its leaking through the bore when the piston shrinks and just live with it. If part of a ring was broken would it not destroy the cylinder and be making bad noises?

[Guest]

forgies can tend to do this due to increased piston /bore - esp if the reconditioner gets it wrong by a couple of thou !!

What oil are you running? 5w/30?

[KarlGTB]

Its always been run on 10w40. Its a pretty noisy engine cold but still quietens up ok with a good run. Do you get much wear in the bores from the cold start piston slap?

[KwS]

Mine had done 40,000 since rebuild. I suspect my culprit was the rich as fark tune on the link causing bore wash since it was built (had the same tune even during running in, thanks previous owner!). I also had very noticeable piston slap when cold.

[Guest]

Real noticable slap is normally poor machining

yes forgies (aftermarket ones) will be noisey when cold but they shouldnt be real loud

Bore wash will cause problems under most driving conditions as the rings are sealing properly

I run 10w60 in the coupe engine, did have a few problems with 5w30 and smoking issues

10w/60 will also help hot oil pressure values too over 10w40

[KarlGTB]

I guess i'll just convert it, try it on 10w60 and hope for the best.

[ADIKT]

I also had a puff of white smoke when starting up sometimes... mostly when cold sometimes when hot... Did a bit of research and suspected it to be because it was forged. never had any issues... Maybe you could take a video and post it if your concerned. So atleast we could see how excessive it is?