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Discussion Starter #1
Hey everyone,
I own a Civic 95 sedan, D16 turbocharged.
Specs:
D16 stock internals.
Stock I/M.
Front big intercooler.
Ebay turbo T3/T4 - A/R 50. boost ~ 0.5 bar.
TIAL wastegate.
Ebay Exhaust manifold + 3" straight pipe.
Turbo Ibiza exhaust.
Greddy type s BOV.
P28 custom chipped, street tuned.

Some days ago I went on a approx. 1 hour trip. Suddely, Probably, after letting off the gas after boosting, there was a big explosion and, white smoke came out of the engine bay. Turned the engine immediatly, open the hood and.. OIL anywhere.

After letting the engine cold a little bit, I've searched what went wrong. The only thing I found is fried plastic band laying underneath the car which, I dunno where came from. It seems like the the oil sprayed out of the pcv valve hose, which I kept open temporary. But i'm not sure about it.
A known problem is that the turbo leaking small oil amounts to the I/M side.

Strated the engine, and everything sounded alright, without oil leaks or stuff like that. I drove the car like that for ~ 60 km without trying to boost, and the engine was working prefctly.

I took the turbo kit off the car to check what went wrong and, for now the only weird thing i found is, that the oil return line was touching the downpipe and fried a little bit. may I cause the problem?
Got to mention it was a pretty hot day.

Also i'm suspecting the BOV, which did weird noises and seemed like it keep opening even at boost.

The car running those days nicely without the turbo, so I keep blaming the turbo for doing all the mess.

Someone told me that may the turbo pressure went through the rings to the crankcase, and it was a tamporary failure. Is that possble?

Is it possible that the oil sprayed out of the turbo itself?

What do you guys think?

Any help will be appreciated.
 

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What kind of catchcan/PCV setup are you running?
:3dtard: This is a very important question. You should do a leakdown test and see what numbers you come up with, to me it sounds like rings.
 

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i also think it has to do with rings or pcv system. a Leak down test is going to give you your best information on how to proceed.
 

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Discussion Starter #7
Can it be rings even though the engine runs perfect W/O turbo, and not smoking?
 

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Discussion Starter #9 (Edited)
I bought the car with the turbo already installed.
The PCV valve was connected like stock. A soon as I got the car, I took off the valve, and the hose remained open to the free air, just for a short preiod untill I buy a catch can. There is a filter on the valve cover.

At this time, the shit happend, and I think the oil came out of that hose. Not sure about it.

Turbo explosion can cause a same situation?

If it's the rings, what can cause them explode one bright day?

Got to mention that I haven't done tuning the chip. Tuned it only at cold air. And that day was pretty hot.

Thanks again.
 

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Oil can come out of the PCV Tube/Hose. That's what it's meant for. Boost can cuase excess pressure in the crank case, causing more oil to spray out. Especially if the rings are bad. But having oil come out of the tube doesn't necessarily mean the rings are bad.

What do you mean it's only tuned at cold air? How are you tuning, ie what methods, program, etc?

At what times/scenario/rpm/boost level does the BOV make the noise?
 

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Discussion Starter #11 (Edited)
Can hear the BOV from 3000RPM above. Below that speed the BOV works either, but makes less lounder noise.

I took one of the two springs (the bigger one) out of the BOV, cause it was too tight, and made a turbo surge. Now it sounds like the BOV leaking boost at hard acceleration.

My friend tuning my car using crome. He's a pro. We're driving around the city and tuning real time.

Sorry but, I can't understand why, if the rings are bad, there was a one single oil shoot event and, it wasn't shooting oil (even small amounts) every boost?

I really appriciate your help, this is a great forum. :)
 

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What do you mean you can hear the BOV? What kind of noise is it?

Did you figure out where the oil was coming from?
If the piston rings are fucked, you'd be leaking oil when driving the car everywhere (after the fucking of the rings, before you'd be problem free). But if they're fine, then it would drive fine NA/Out of boost.

Depending on cylinder pressures, little bit of blow by (combustion pressure leaks past the piston rings into the crankcase) might not be noticed, but under high boost/rpms, you might notice it more.

How is your oil/coolant? Mixed, milky? How's the water level?

I got no answers, but if you answer those questions maybe someone more knowledgeable will come along and help ya out.
 

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The crankcase can build alot of pressure, my gsr would do the same thing and seep oil out from everywhere until I did a proper catch can setup on it. I did have one ring fail completely and it was more than likely the cause of the extreme pressure because it was leaking boost past it into the crankcase. Im sure after a long drive and it being hot the pcv may have got stuck closed and that is what popped, that is where it came out of correct? So like what crxlifer said get a proper breather system setup, do a leakdown test just for good measure for your engine. No idea what up with your BOV, if its adjustable maybe its just set too low and needs the spring adjusted. if you can hear it while in boost then more than likely its stuck open and that happens. If it just when you let off then it just could have a soft spring.
 

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Discussion Starter #15
The BOV makes "Pff" sound only. I think I could hear it while in boost. Can a BOV boost leak can damage the turbo? The coolant level is OK, no milk or stuff like that. Oil level OK. The car runs FINE N/A now.

I'll check what you told me and update soon.
 

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Discussion Starter #17
Done a BOV leak test, through the vaccum pipe. it failed. The BOV made turbo surge noises.

I have'nt had the time to buy a new one, so I took one sping out of the two inside the BOV, and since then, the surge noises stopped and instead I hear a "Pff" ones.
 

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hi guys,
i tuned the car with crome pro.
we tuned it on a cold day, and didnt had the chance to meet and wune the car in a hot day to dial in all the corrections.


about the pcv system,
i removed the pvc vac line and pcv valve from the car, i do this to any honda i tune, some pepole just leave it like oem :S.
 

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Discussion Starter #19
Update:
The oil escaped from the A/C system, the upper hose exploded.

Probably because it was close as hell to an exhaust pipe, came out of the wastegate.
 

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Update:
The oil escaped from the A/C system, the upper hose exploded.

Probably because it was close as hell to an exhaust pipe, came out of the wastegate.
So u didn't know it was greenish oil? But yea ac lines should be wrapped. A few people have melted there lines and it shoulds like a pruge valve going off.
 
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