TwinTurbo.NET: Nissan 300ZX forum - Re: Scary weekend: (somewhat long)
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Subject Re: Scary weekend: (somewhat long)
     
Posted by nixit(da][as) on September 03, 2002 at 12:37 PM
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In Reply To Scary weekend: (somewhat long) posted by AshsZ (Fab Whore, Ph.D) on September 03, 2002 at 12:04 PM
     
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: Now I'm not sure what's going on with this, perhaps a little piece of carbon or aluminum from the piston had gotten itself between a valve and valve seat and it just got burned off and is no longer a problem, but it doesn't take much of anything stuck in that position to cause a cylinder to get 95% leakdown. I'm convinced that it isn't the cylinder wall being scratched by something like the little piece of platinum that was in the electrode that I burned off several thousand miles ago, because if it were, a cylinder is not going to fix itself. It must have been something there that is not there anymore, i.e. something stuck in a valve. Has anyone ever seen something like this or heard of something along these lines? I was thrilled to find that the problem was gone, but I dont want to see it again! I'm thinking of pulling the injectors and having RC engineering flowtest and calibrate them at this point, it will be $150 well spent..


i've seen cylinders get washed of oil (damonz, bernie) and lose compression. once the engine gets cycled over for a bit and oil pressure to that cylinder comes back, so does compression. other variables may be at hand, but i doubt any damage was done.

however.

i highly do not recommend exceeding 14 psi on stock turbos. no matter your setup. keep in mind, it is IMHO.
17psi can be done, but that kind of psi is for the fool hardy. for my setup (no aquamist), i never exceed .8 bar.

getting those injectors balanced and flowed. a VERY smart thing to do.

"I'd rather be a failure at something I love than being successful in something i can't stand" - Dave Williams, DrowningPool.

     
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