Hmmm , What Do You Guys Think.
12-22-2003, 06:10 PM
#1
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Join Date: Mar 2003
Posts: 410
I already have my suspicions , but I want to know what you guys think . here's what happens , when I rev. the motor past about 6000 rpm when the car is at a standstill or moving and let off the gas , then go back on I get a fairly large amount of blue smoke from my exhaust and over time I actually loose oil from my sump. I suspected the turbo and had it checked and rebuilt (there was a "massive imbalance" on it which was causing the turbine side oil seal to wear out , so it was rebuilt) , after this the problems' still there , my oil feed oririce size is 3/32" , if it were too big I suppose it would cause a constant smoke problem .
The motor pulls strong past 9000rpm , idles well and starts quite easily if hot or cold , my plugs come out with a brown/grey deposit on them indicating "good" combustion , I am now thinking oil "cage " rings and / or the oil seal O rings but my builder assures me that those things never cause problems and this guy is the "tini Ito" and I know he knows what he's talking about. I don't want to pull my engine unless I have to ( you know how much fun that is ) .
The motor pulls strong past 9000rpm , idles well and starts quite easily if hot or cold , my plugs come out with a brown/grey deposit on them indicating "good" combustion , I am now thinking oil "cage " rings and / or the oil seal O rings but my builder assures me that those things never cause problems and this guy is the "tini Ito" and I know he knows what he's talking about. I don't want to pull my engine unless I have to ( you know how much fun that is ) .
12-23-2003, 06:32 AM
#4
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Join Date: Aug 2002
Posts: 65
The symptoms sound exactly like what you get with worn oil control rings/seals. I have only seen one engine that was excessivly bad. It did exactly the same thing. When I pulled it apart the the oil rings/seals were completely stuffed. However, it was an old 12A which had been sitting around for a few years and the rubber o-rings were hard and brittle.
Could possibly be the turbo. Maybe the oil pressure is just getting high enough at high revs to make it blow past. Don't know about all this 3/32" **** (stupid imperial system), but my turbo seems fine with a 2mm restrictor (although most people seem to use around 1.5mm). It's a long shot. Like you said, I'd expect that if it was too big the turbo would leak all the time.
Could possibly be the turbo. Maybe the oil pressure is just getting high enough at high revs to make it blow past. Don't know about all this 3/32" **** (stupid imperial system), but my turbo seems fine with a 2mm restrictor (although most people seem to use around 1.5mm). It's a long shot. Like you said, I'd expect that if it was too big the turbo would leak all the time.
12-23-2003, 07:23 PM
#9
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Join Date: Mar 2003
Posts: 410
Nope , I have three vents , two original one and another through the cap. when I remove the cap and do a free rev . there is absolutely no blow by and I build about 5 psi boost when I do that.
I also suspect the O rings because they aren't original Mazda , A guy was selling a Felpro kit (so he clamed) , the price was good so I bought it , now I know why the pricewas good.
I also suspect the O rings because they aren't original Mazda , A guy was selling a Felpro kit (so he clamed) , the price was good so I bought it
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