TwinTurbo.NET: Nissan 300ZX forum - Kinda disheartening........
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Subject Kinda disheartening........
     
Posted by BOOZTD 3 on April 22, 2005 at 1:01 PM
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Message After installing my test pipes on sunday and doing a dyno run at low boost (13psi) I discovered that the driver's side of my exhaust went really lean. Initially the sniffer was in the drivers side, so I was wondering what the heck was going on to make it lean. We went to the other side and it was way rich (below 10.1)

After wondering about it for a little while, and talking about it with a few people I decided to pull the plugs and do a compression test as well. Turns out one of the plugs on the passenger side was just about toasted. Happy that I was finding issues to be corrected I went on with the compression test. This is where shit really started to hit the fan. I started measuring from front to back. I didnt get above 120psi on any cylinder. The middle drivers cylinder I couldnt even get a reading.

I had a talk with ash and he had me manufacture a ghetto leak down tester. It basically involved removing the shcrader valve from the compression tester, and then hooked up an air compressor to it, while in the cylinder. This would allow me to turn the engine over manually.If the cylinder was sealing correctly , it would be impossible to turn the motor over. Well this was not the case. The whole time air was blowing out the exhaust, so it looks like i burned an exhaust valve down.

I havent decided how to go about it yet. I was really hoping this would be the first summer I got to enjoy it. The strange thing was is that I drove it home fine from the dyno session and it even made 352rwhp @13psi (i thought was impressive) in its current state. I may just drive it (lightly) through the summer and start saving so I can pull the motor when it gets cold out, and possibly do manifolds, cams, etc.

Any suggestions?






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