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oil in the innercooler piping
As far as I can tell, the FD runs fine. It boosts normally for the first and second turbos. Sometimes, I'll get this strange whistling sound, but it comes and goes.
I figured it was about time I started getting my reliability mods underway. As I was taking out the stock innercooler, I found fresh oil in my hoses. I wrote this post because I don't think I should find oil there. |
a little oil is ok.
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A catch can might be a good idea.
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This is something which I have come to believe is relatively normal.
In addition, oil in the intake area, if you have a CAI. I have a relatively new FD, with 26K total. I have noticed the same oil residue. When I did my V-mount install, I noticed crud on the left side frame rail which the M2 CAI sat on. It was dirt encrusted on oil. Now, some of this was my fault, because I hadn't cleaned the K&Ns in a year and a half. Stupid of me. Anyways both, or at least the lower filter had a good black layer on the bottom of the filter. There is a similar oil on the inside of the K&N, and a little bit is in the inside of the new RE V-mount CAI (1100 miles on setup to date). If I wipe my finger on the inside of the front of the CAI, I get a little bit of oil. Some have said this is blowback, and normal, possibly exacerbated by my love of taking turns tight and hard. Others have said it is a turbo problem. Given the way they pull and the relatively low mileage on my car, I don't believe it is a sign of turbo failure/issues. Then again, that is what I want to believe as well. I have read around, and am thinking of putting a catch can in there. However, catch cans don't appear to be necessary mods unless you are tracking the car. |
I took my car to the area dealership since they, according to several sources, have one of the most experienced rotary mechanics in the country. I wanted an opinion on the health of my motor and turbos.
What a mistake! They took off the IC piping, saw some oil, and pronounced both the engine and turbos dead and in need of replacement!!!! Wouldn't even do a compression test. LOL! Since then, $100 poorer, I have tracked the car 4 weekends and put a couple thousand miles on it, recently pulling an inordinate amount of WOT runs working out boost control issues. I'm happy to say the car runs great! So... maybe it isn't a healthy sign or maybe it is just blow-by. But, at least in my case, it has definitely not been a sign of imminent engine or turbo failure. YMMV BTW, thanks to RTS3GEN for taking a look at it, convincing me the dealer was full of sh*t and that the car ran strong and was ready for the track. |
alright so this is what i have heard/ learned:
when mazda was put in the turbos on the fd they were not planning on oil going through the blow by. they assumed that air would be the only thing traveling through the ic piping. POOR PLANNING! so don't worry. we all have the same issue with the oil in the ic pipes. i also heard from a good source (jeff at rotory power) that a catch tank would be a good idea. reason being that (according to jeff) oil blown through that way actually lowers our octane. im not 100% sure if this is right since there are soooo many out there that premix. but maybe i misunderstood or perhaps its the way the oil is intrduced to the cumbustion that lowers the octane. now i am curious if there is anyone else out there that heard this. i really doubt that jeff was wrong but a little backup would be nice. |
oh forgot to mention.... zullo,
lol you took your fd to the dealership?! c'mon you gotta know better than trust them. :p: i'm sure you learned now. they have hardly any idea how our cars work! |
If you have your PCV valve removed, then the scavanged oil is directed into the primary turbo intake and blown back up into the intercooler piping. Either get a catch can or reinstall your PCV valve.
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Hasn't this been covered 100s of times?
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also, i recently found out if your oil injectors have faulty diaphrams in them, it will allow oil to seep into your primary inlet. this will get drawn in by the primary turbo and shoved into your intake tract. mine are doing this so i bought new injectors from malloy for $21 a piece. haven't installed them yet, but it's worth checking into. just take your y-pipe off and see if it appears as tho the oil is coming through the primary, both, or neither and it'll help ya pinpoint what's going on
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I'll post this up again:
As for oil on the intake, doesn't really mean the turbos are bad. A HUGE misconception in the 3rd gen community is the amount of oil in the intake tract determines how close you are to a blown set of turbos. Not true, mostly, most people forget that the 93, and 94's have a PCV system. Positive Crankcase Ventilation system, which succinctly means when the boost fills the crankcase to a predetermined limit the air and oil must go somewhere. There are a series of hoses coming off the manifold to the oil filler neck and one comes down strait below the hose going to the manifold(which contains a black and grey checkvalve, this is the pcv valve)this hose goes under the alternator and down to the pipe cluster that goes behind the air pump. There are 2 hoses that come up off of the primary turbo inlet that attach to these pipes. Since the turbo inlet side is sucking air, this is the source for vacuum for the vacuum chamber(helps control the charge control valve and transition) and the other hose is the "dump" for this PCV system. Now, the harder you drive the car and are on and off boost, the more the pcv system will be active and "dumping" oil into the inlet side of the primary turbo, and if the oil is dumped into the incoming air, then logically it, since it is liquid and cannot be compressed(right) it just coats the intake piping and leads one to believe the turbos are going bad! |
Thanks all.
I did a search on this beforehand, but I was spelling intercooler as innercooler. Nothing came up so I posted. |
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