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Subject Compression test results...
     
Posted by degradated on September 26, 2002 at 3:00 AM
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Message I tested my car tonight after driving it around for a half an hour pretty vigorously.

1 130
2 125
3 125
4 140
5 135
6 141

I found it odd that cylinder 6 had the highest compression of them all. It looks like they're within about 11% of each other, but the numbers seem low overall. Nissan service manual says that 171 is max and 128 is minimum. Could my rings in 2 and 3 be bad maybe?

The motor only has 41k original miles on it, but I've been boosting 15 pounds lately on 91 octane in high heat, and I'm worried that I caused this. I've really only heard detonation once and I immediately backed off (and that was when it was at stock boost after running the air conditioning for 25 minutes at idle on a 100 degree day).

Also I noticed slight detonation on each plug (small white speckles, but there were very few of them and they were very fine).

     
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