Subject	Compression test
Posted by	Kutdawg on February 09, 2014 at 1:56 PM
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Message	Hey guys, Im new to the forum, but ive had my z for about 12 yrs. 1995 300zx twin turbo, 139k miles. manual 5 speed trans. the only mods ive done at this point is a Borla catback exhaust system. There is a valve cover leak, and it will need the 120k service, which will cost about $2k total. I am deciding whether or not to repair or sell, so i decided to do a compression test to give me a baseline about engine health/life. the results are: Cylinder1 1. 160 psi 2. 160 psi Cylinder 2 1. 155-158 psi 2. 160 psi Cylinder 3 1. 155 psi 2. 155-158 psi Cylinder 4 1. 160 psi 2. 158 psi Cylinder 5 1. 155-158 psi 2. 155-158 psi Cylinder 6 1. 140-143 psi 2. 140-143 psi So i am concerned about cylinder 6. From what i have read, results should not vary by more than 10% and cylinder 6 varies by exactly 10%. Is this bad news or satisfactory for the engine? engine rebuild is not an option at this point. Compression test was a dry test, engine was warmed, but i forgot to hold the throttle wide open when testing. not sure how much that affects results. Any help would be greatly appreciated!!
Follow Ups	Compression test - Kutdawg 13:56:16 02/09/14 That's a common issue with the vg engines - SirpriZ 18:01:48 02/09/14 If the Crossover Tube was off, then its breathing fine - Cjw3 21:55:12 02/09/14 I would not worry about it at this time - John (MD) 08:14:17 02/10/14 Re: Compression test - Kutdawg 08:33:15 02/10/14
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