guy i have a p600b kit and it has very low miles on the motor and on the blower. It smokes something awful under boost. Nothing at idle, motor has no blow by, is there anything else that can cause this other than rings gone? i can't figure out how i have no blow by if rings are this shot?

 

is this blower oil cooled? turbos will leak oil from there center section sometimes into the intake or downpipe and creat smoke...maybe somethign like that is happening

 

yes its oil cooled, but the throttle body is clean as it can be. but she sure smokes bad i know that.

 

check over your PCV system thoroughly.. smoke under boost only could be pressurization of the crank case causing oil to push by the rings.. and if you don't have a breather system for while your under boost, it is something you may want to consider... if your rings are not totally seated yet there will be some natural blow bye until they do, getting the blow bye out of the crank case is important, if you do not you will continue contaminating the oil. just somethign to check over!

Chris

 

I think on my procharger the instructions are not right regarding the pcv system re-routing, I am also having smoke under boost and a bad smell in the cabin of the car, and oil getting very black pretty quick. This happens even with a brand new pass. side breather. Any suggestions for us for getting a better vacuum in the crankcase to remove all that pressure. I think I remember reading a post by a member on here username WS6...something and he mentioned the instructions for the pcv system didn't work well and caused all the smoking. He recommended routing it a different way but I can't remember how he said.

 

Here is the link to describe my PCV setup. If you go to ProjectTA there is a guy who modified a air oil separater for a compressor to put inline with his breather hose.

http://web.camaross.com/forums/showt...&highlight=pcv

However I don't think the PCV system is causing your problem. Are you sure it is oil smoke and not an overly rich condition? If your burning enough oil to see it when you accelerate thats bad news. Valve Stem oil seals or rings would be a more likely culprit.

 

Interesting to read all these guys blowing smoke. My motor has begun blowing smoke very badly under boost. I have about 24k miles on this motor which never smoked or burned oil. At first I also thought valve stem seals as it seemed to blow smoke only under deceleration after going into boost. I replaced the seals and it seems to be as bad (or worse). I'm left thinking rings. I plan to pull the motor and take a look at it. Have it sonic checked to ensure the cylinders aren't out of round then see if I can get by with a hone and new rings.

Which is how I found this thread ... I was searching on "rings". I currently run Plasma Moly" rings on Wiseco pistons. I'm looking for some recommendations on rings for my application. I run 9.42:1 compression and a Vortech w/ 6psi.

Thanks

 

Just for reference guys, i found the problem, Th eintake had been milled so much that it was allowing it ot seal at all, it was just way to thin and would allow it to actually suck oil under boost, new intake and probelm solved.

 

just wanted to bump this old thread and hear some new opinions, my vacuum gage shows plenty of vacuum @ idle but smoke still comes out of my passenger breather with the factory pcv routed as the procharger instructions say"run a hose connected to the factory pcv on side of manifold and leave one inch from air filter". I now have made a vacuum with my pcv & my pass valve cover routed inbetween my air filter & MAF via a custom tube. Havent tested it yet & wondering if you guys think it will help with dark smoke during boost. Also car has been tuned twice & i left it a little rich for safety but its not too rich to cause this much smoke

 

If he was under boost, how would the crank case inject oil into the intake manifold if the pressure in the intake was more than the crankcase?

 

Just curious - are you running big injectors or still with the FMU? The FMU will run really rich and make smoke. If not then you are blowing something else out the tail pipe. I have the PCV routed the way the factory did it, but added an extra check valve. That seems to work for not pressurizing the crankcase past the PCV valve under boost. I also have a breather on the valve cover which is moderately sufficient - I need to add another to the other side. Smoke shouldn't be puffing out the valve cover at idle...
You don't have stock pistons, do you?

 

'Dark smoke'- if its black your running too rich, if its blue then you are pushing oil out the exhaust. What's your AFR at WOT? My car is smoking under boost, but its because my opti is having issues and I haven't got around to swapping it out.

As far as the OP fix, I'm a little confused as well.

 

Got 42lbers and !FMU once dyno tuned. My oil gets very black quickly and seems to have a bad oder inside the cabin, ive even checked the charcoal filled canistor by the fuel tank and checked the lines with the egr system and everything is in order. The smoke is dark but not "black" but maybe a dark blue. but doesnt happen when sitting still and revving it that bad(some but not too bad). Would my boost gage show a good vacuum even if my rings are weak? i guess im trying to see how to prove if my rings are weak or if it is just blowby during boost. Also the smoke coming out of the passenger valve cover breather is mostly greyish at idle and smells of burning oil is that proof of weak ringlands as its a stock LT4 block out of a corvette but stock pistons

I am curious about your situation above onefastmx5 as I seem to have a feeling like power is being retarded but not a miss when in 3rd gear under full boost but my dyno run didn't show it being taken out though it was a year ago when tiuned. No-one else feels it when riding because its not like a hesitation but just kinda stops accellerating. Kinda thinging it might be my opti as ive replaced my coil & added a MSD box but been about 5years with current opti. 1st-2nd gear is strong as ever though, anyway to know whether a LT4 knock module would help OR if its opti issues, guessins finding some higher than 100octane gas

 

You could have a couple things going on - first of all, the stock pistons will break the ring lands. partly because they are weak cast things and you may have detonated in a couple cylinders at one time, and the ring gaps are all wrong and if they get hot, they could butt up and cause trouble. If you have smoke puffing out the oil fill hole during idle, that is probably the ring lands on one or more pistons. It's not so much of an "if" kind of thing, but a "when".

You could be having knock retard, but you need to log it and see. If you can get the 100octane unleaded, that will help troubleshoot it. If the pistons are broken, oil will get in there and cause more detonation.

Also, depending on what valve springs you have, you might be floating the valves due to weak springs - you need to add the boost pressure to the spring pressure you think you need. Last thing is fuel system - most stock fuel systems are inadequate, and even a hi performance setup like a stock pump/booster pump may have issues under boost at some level, and not keep the pressure up. Not sure where you are with 42s. Fuel pressure gauge, boost gauge, lambda gauge - all good stuff in a blower car.

 

Mine is doing it randomly, sometimes it hits good, sometimes it has that "lack of acceleration". LT4 will help if you are getting false knock. I'm assuming my opti is doing it because I get code 16 randomly and just clear it when I do (starting to fail). Only way of knowing for sure would be to switch it out, but I'm trying not to fork any more $ into current setup, trying to invest in new build.