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Version 8 STi oil exploded all over the engine bay? (Compression test update, 0psi in one cylinder)


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UPDATE:

 

I have done a compression test on the engine (It is the first time I have done a compression test and I did it using a new tool, it wasn’t some cheap piece of s*** so I hope the results are accurate)

 

Cylinders:

1: 125psi

2: 0psi (Completely dead, needle didn’t move at all)

3: 135psi

4: 115psi

 

That means that between cylinder 4 and cylinder 1, there is a 16% difference. Just outside the acceptable range. I did this on a cold engine and didn’t squirt any oil in the cylinders. Throttle was wide open. Engine was full of fresh oil, and none was leaking.

 

The most alarming number from the results is that we got ZERO compression in cylinder 2. Initially thought that we hadn’t put the tool in correctly, but we tried a few times and just couldn’t get anything out of it.

 

I find this quite confusing as given what I had discovered previously I figured that it would be a bad piston ring, but that surely wouldn’t be capable of causing ZERO compression. Perhaps there is a broken valve, but how could that have caused enough pressure in the crankcase to spray oil out the dipstick?

 

This is the original post below incase you'd like to read it!

 

Hi

I recently purchased a JDM Version 8 WRX STi with a supposedly “blown motor”, managed to get it for a really good price and knew it would be a great project which would really stretch my skillset.. win win. I have a fair bit of experience doing general maintenance and mods to cars, but this is a whole different league for me.

I didn’t get a very clear description of what happened from the previous owner, what he did tell me was that he was driving the car under boost and then something gave up. He pulled over, and found that there was engine oil sprayed all over the battery side of the engine (not that much made it to the intake side). Lots of white smoke from all the oil and it apparently started to develop a slight ticking sound. He has a video from when it happened, personally I can’t hear any unusual ticking noise, I suspect he may have just been hearing the classic Subaru ticking you get on these engines.
 

 
NcsemtSSNvbvRvjgEZBLgTxI-ON2_FvJ9iPpHJ1m
 



It’s been about two weeks since that happened and as of yesterday I have the car sitting in my driveway. I’ve begun the process of diagnosing the issue, here is what I have figured out so far.

  • The engine isn’t seized and turns over well, sounds completely normal when it is cranking IMO. Granted I have only briefly turned it over as I didn’t think it was a good idea to have it cranking with such a small amount of oil left in the engine. Here is a link to a video of it cranking
    https://photos.google.com/share/AF1QipOXua_4Q3qySSy59KMGdvUa2BkdFkU5YArAsZ2RyCWZB3pT8efwejMTNMQ2vyqF0g/photo/AF1QipNEVVmnjX2GksClrRuIxwCI1BJJG_kyD4DKPwOd?key=OW52QWZydGFxQ2w3MnpaX2NUZ2ZxT0w4c3ZtZDFR
  • I have fully drained the remaining engine oil, there was about 2.5L left. There is no coolant mixed into the oil. I cannot see any glimmering or signs of metal having made it into the oil.
  • Not sure what type of oil was in the car or how long ago it was changed, but it is quite thick and doesn’t smell very good, it kind of has a fishy odour.
  • The coolant system is still full, it seems to be completely intact and has no oil mixed in it.
  • I’ve removed the top mount intercooler, there was a SOLID amount of oil inside this. Not a healthy amount at all, it was enough that it poured out onto the block. This photo just shows the left over in the intake plenum.
    6DCJZpTke_5qLCSSmSYOsQF6o36f6_neMYyMITmJ
     
  • There is also oil a reasonable amount of oil in the cold side of the turbo (possible turbo seal? But doesn’t explain how all the oil sprayed into the engine bay).
     
    H_vMOJA3alQCQyj0TkTFW_3f_247qF132A-_Umyu
     
  • No oil found in the air filter.
  • Cannot see any holes or damage in the block
  • Cannot see any damage to piping or lines around the engine (this is really leaving me stumped as to how so much oil made it out of the engine)

I think the next step is to run a compression test, hopefully this tells me if something is seriously wrong inside the block.

If anybody has any ideas on what is wrong with this engine or suggestions on next steps for diagnosing the problem, then I would greatly appreciate any advice.

Cheers!

Edited by eZ_Harry
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  • eZ_Harry changed the title to Version 8 STi oil exploded all over the engine bay? (Compression test update, 0psi in one cylinder)

Sounds like #2 is dead and engine is blown.

could be rings, piston or bore.

unlike to be valve train if the oil came out the dip stick. Pressure would escape the easiest way.

 

even rod snapped, not sure what Subaru sounds like with those but on inline engine its pretty loud, you can’t miss it.

 

piston could have cracked around the rings and leak pretty badly.

Melted piston would be least amount of damage and s*** in the engine.

 

Borrow or buy a flexible camera and stick it through the spark plug hole.

With piston at the bottom have a look around and you’ll likely see what it is.

 

You could listen for the air leak from intake or exhaust ports when you leak test it, to see if the valves are sealed. PCV valve would be most likely place for the compression test air to escape.

 

With 0 psi on #2 and all the oil in the intake etc would be worried about the cylinder imbalance at this stage.

 

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18 minutes ago, Serchn said:

Engine crane, they are cheap as chips these days. At least then you can move it around when needed

 

Yeah I've been taking a look at them, not too badly priced. It is more a matter of building the courage to do it, rather than having a do it. I've only done the basics of mechanical work, various gaskets, tie rods, suspension etc. So this seems like it would be quite a big jump... well actually pulling it doesn't seem to bad, rather putting it back in is where I'd expect to get really challenged

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10 minutes ago, eZ_Harry said:

 

Yeah I've been taking a look at them, not too badly priced. It is more a matter of building the courage to do it, rather than having a do it. I've only done the basics of mechanical work, various gaskets, tie rods, suspension etc. So this seems like it would be quite a big jump... well actually pulling it doesn't seem to bad, rather putting it back in is where I'd expect to get really challenged

 

It's a challenge for sure... lot's of perseverance required... but challenging yourself is a good thing.

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