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what should the compression be?

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what should the compression be?

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Old 09-09-2003, 06:30 AM
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hauling ass-a
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Default what should the compression be?
how many pounds should i have for a stock 2000 502 mag?
 
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Old 09-09-2003, 06:47 AM
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Old 09-09-2003, 07:40 AM
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hauling ass-a
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did a test last night and came up with 120 should i rip out my hair?
 
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Old 09-09-2003, 07:42 AM
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Did you have all the plugs out, the throttle open, and a fully charged battery?
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Old 09-09-2003, 08:10 AM
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Merc has a service bulletin on doing a compression test on their engines.
 
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Old 09-09-2003, 08:51 AM
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the throttle was at idle position, batteries charged, but did not pull all plugs. Anything else would be appreciated guys.
 
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Old 09-09-2003, 09:23 AM
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Pull all the plugs and open the throttle, I'm sure your compression will be fine.
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Old 09-09-2003, 04:05 PM
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I used a cheapo tester and had reading of 90-110. Took it to a proper mechanic , his tester read 147-153 on a motor with 220 hours on it at 1800 feet alt. FYI alt will affect the numbers. sj
 
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