Whats Wrong With The Rb25?

[On Edge]

Hi there

My RB25 series 2 has been playing up, and to be honest is giving me the s...ts

It has been burning white smoke for a while now, more so on low load

i replaced spark plugs that were fouled and it is running again an the smoke is pretty much gone at idle but appears when accelerating.

Most of you would say it is turbo, i have an aftermarket garrett ball bearing and it may have a leak in the oil line. The turbo feels down on power.

Now i thought it was low compression/cracked piston before the spark plugs, but with new plugs motor sounds smooth an turbo sounds and feels weak.

as a side note the car has blowby, could it be a problem other the engine thats creating it?

On deceleration the car backfires loud and frequently

also when hot it can be common to not hold idle

Any help is appreciated

[PM-R33]

Best bet do a compression test first to suss that out. How much blow by are we talking? Like filling a catch can up?

[On Edge]

Best bet do a compression test first to suss that out. How much blow by are we talking? Like filling a catch can up?

well i dont have a catch can ( have to get one) but can see it spit oil out the hks pod filter, and has blown the dipstick out, seems like excess

[PM-R33]

Just double check over all the standard emission lines coming from the cam covers and make sure the one way check valve or something isn't blocked causing it to pressurise the crankcase. Probably a long shot but the dipstick blowing out is a bit strange with the standard emissions gear.

Only time a dipstick should blow out is if your crankcase can't breath through the cam covers so it finds the path of least resistance, the dip stick.

That or your engine has actually cracked the ringlands. So yep, compression test time I would say.

Edited June 29, 2010 by PM-R33

[OMGGTR]

white smoke... man honestly ur saying its not the turbo yet ur saying the turbos behaving low on power... ?

Do a comp test which i think will just give u peace of mind ... more or less its the turbo..

[The Bogan]

Cracked the ringlands / blocked vent/hole in piston, to blow out the dipstick you first need to pressurize the crankcase, a blown turbo wouldn't do this would it ?

[tuned_nismo]

white smoke usually means coolant is being burnt, you could have a blown headgasket, wrapped head or cracks in the water jackets

[On Edge]

Just double check over all the standard emission lines coming from the cam covers and make sure the one way check valve or something isn't blocked causing it to pressurise the crankcase. Probably a long shot but the dipstick blowing out is a bit strange with the standard emissions gear.

Only time a dipstick should blow out is if your crankcase can't breath through the cam covers so it finds the path of least resistance, the dip stick.

That or your engine has actually cracked the ringlands. So yep, compression test time I would say.

i will check the pcv valve an everything else again

put new spark plugs recently as the old ones were fouled, is idling perfect and is not blowing smoke at idle

there is some oil steaming from under the turbo when its warm.

so i am suspecting the turbo oil return line needs replacing.

Hopefully thats all it is

[Jdfnq]

Silly question..... But how much oil is in the car????

It sounds a little like it has been overfilled when last serviced.....

[On Edge]

Silly question..... But how much oil is in the car????

It sounds a little like it has been overfilled when last serviced.....

nah its not that, it was filled correctly. ive burnt heaps lol to the point where the oil light comes on, an have refilled it a few times

[Rolls]

First do a compression test to rule out piston rings and it just generally being a worn motor. If this comes up good then I would be looking at the turbo oil seals leaking.

You say it is white smoke, is it definitely white smoke and not blueish smoke? Because white smoke indicates burning water/coolant which creates steam and a light white smoke. Oil is generally more of a blueish tinge, if it is indeed white you could have a partially blown head gasket.

Edited July 6, 2010 by Rolls

[On Edge]

suspicions confirmed, 90psi on cylinder 4 an 6, its rebuild time

[Rolls]

suspicions confirmed, 90psi on cylinder 4 an 6, its rebuild time

What was the compression on the rest?

[On Edge]

cant remember off hand but were acceptable