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Author	Topic:   Mercury V6 Cylinder PSI Reading
half shell	posted 03-08-2010 06:48 PM ET (US)         Hello. [Apparently upon measuring the peak cylinder pressures in a] 1998 Mercury 200EFI [the following readings were noted: in] cylinders 1 through 5, 145-PSI; in cylinder #6 140-PSI. Is this a good test? And overall, what is the reputation of a 1998 Mercury 200 EFI? Regards Rob
Tohsgib	posted 03-08-2010 08:17 PM ET (US)             Yes numbers are great. How good is the reputation? Been running almost 13 years so far.
jimh	posted 03-09-2010 12:50 AM ET (US)             Typically a tolerance of 15-PSI is allowed for variation among cylinders when reading their peak pressure. Your variation was only 5-PSI. This is within tolerance.
half shell	posted 03-10-2010 09:21 PM ET (US)             Thank you Regards Rob
tom976	posted 03-11-2010 03:20 PM ET (US)             The numbers are good. How was the test done??? Throttle open or closed? Warm or Cold? All plugs loose? Any oil injected into the cylinder beforehand? These type of things can bring the numbers up or down.

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