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Rb26Dett White And Blue Smoke

Acrula

By Acrula,
in Engines & Forced Induction

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Acrula Rookie

Acrula

Posted
Posted

Hello there,

Im hoping that someone here can give me some answers on my questions.

I recently replaced both my turbos to 2nd hand stock ones because there was allot of blue smoke from the exhaust when I let of the throttle.

So after the turbos now are replaced, there is much white smoke coming from the exhaust aswell when idling, also blue/white smoke when I drive.

Anyone have a clue on whats going on here?

The white smoke on idle was not there at all with the other turbos, then it was only blueish smoke when driving.

Hope to someone can help me out some here!

Best regards,

Thomas

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Blackkers Experienced

Blackkers

Posted
Posted

Well as I'm sure you know white smoke indicates head gasket. Have a look at the radiator cap and oil fill cap. But really you should do a compression test as that will tell you straight away

As for the blue smoke, maybe your engine is a bit smokey or it could be the old stock turbos as they could be up to 25 years old now... Should have gone for newer ones like -7s or something

Acrula Rookie

Acrula

Posted
  • Author
Posted

Hi,

thank you for the reply.

I have checked the coolant fluid, and its very green. I checked the oil filler cap and the dipstick, and they seem fine, no white sludge/slime there.

There is however allot of oil in the pipings, and seems like oil are pushin through the rocker cover and sliding down the block. I checked the gasket there, and I couldnt see any defects on it, seems fine to me.

There is also coming white smoke from the rear, right behind the rear turbo. Very white smoke. Got the feeling that it somehow is overheating, but I cant tell for sure, its damn hot and thight to see down there while its running.

Indeed I should go for better turbos straight away, but before I bought better/bigger turbos I wanted to know if the smoke issues went away.

I will try to get a compression test asap.

Thanks.

- Thomas

AngryRB Grand Master

AngryRB

Posted
Posted

If the white smoke wasn't there before you changed the turbo's then its probably just the turbo's that have worn seals, here a thread to read,

http://www.skylinesaustralia.com/forums/topic/428674-rb25det-blowing-white-smoke-after-track-day/

  • 3 weeks later...
Acrula Rookie

Acrula

Posted
  • Author
Posted

Hi, I have now taken a dry compression test.

The results are:

Cyl 1: 87 psi

Cyl 2: 176 psi

Cyl 3: 174 psi

Cyl 4: 176 psi

Cyl 5: 174 psi

Cyl 6: 1,4 psi :):):)

I forgot about taking a wet test, but I guess its not really needed since there is something going on inside that engine:)

My question is, shouldnt the engine be running rough and barely have any power at this state with a dead cylinder? I also thought there would be smoke on idle aswell? There is none, only AFTER boost after releasing throttle past 4000 rpm.

The power is poor, but it runs. Spark plugs had very white tips, so I ssume it has been running lean, and maybe a meltdown has occured.

Here is a small video of my car idling, maybe you can hear something I cant hear, since im new to the rb26`s.

https://www.youtube.com/watch?v=DTPVuKYFbmE&list=UU7qERZQmz7fSSwE-wHb1J3g

XKLABA Grand Master

XKLABA

Posted
Posted

Running ok but down on power, rings and also the cause of the blue smoke, who ever suggested to change turbos cause of blue smoke don't listen to him again :no:

White smoke is from turbos, replace with original ones or better yet -9s :)

87 psi could be just rings ( but not likely ) where 1.4 psi is surely a broken piston :(

If is was valves it would run ruff

HG won't lower it that far with out blowing off rad hoses

Sorry to say but my guess is you need a rebuild or replacement engine :(

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Hi, I have now taken a dry compression test.

The results are:

Cyl 1: 87 psi

Cyl 2: 176 psi

Cyl 3: 174 psi

Cyl 4: 176 psi

Cyl 5: 174 psi

Cyl 6: 1,4 psi :) :) :)

My question is, shouldnt the engine be running rough and barely have any power at this state with a dead cylinder?

RB engine is tough - will run surprising well with a couple of cylinders down but a rebuild looks indicated :(

Acrula Rookie

Acrula

Posted
  • Author
Posted

Thank you for all of the answers guys:)

Im pretty sure im going for rebuild rather than replacement engine in this case.

And yeah it must be a tough engine if it can run like this at the current state.

I allways thought that blue smoke indicated turbo seals going, since blue smoke = burning oil? How come its white smoke when a turbo is blown? Sorry for stupid question, still learning here:)

Best regards,

Thomas Lund

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