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Old 03-13-2020, 01:00 PM   #1
gcd57
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Default *Compression test decode

Can you help me determine if these compression results are good or bad?
The car is a 1959 Mercedes 220S Ponton with 120k miles

No. 1 was 125, number 2 was 100, number 3 was 100, number 4 was 95, number 5 was 110 and number 6 was 120.

Thanks
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Old 03-13-2020, 01:21 PM   #2
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Originally Posted by gcd57 View Post
Can you help me determine if these compression results are good or bad?
The car is a 1959 Mercedes 220S Ponton with 120k miles

No. 1 was 125, number 2 was 100, number 3 was 100, number 4 was 95, number 5 was 110 and number 6 was 120.

Thanks
A little too much spread for me. Run the test again with a couple of squirts of oil in each cyl and see if the numbers go up. If the numbers increase, then rings are probably the issue, if it stays at the big spread, then valves are the likely culprit. I would think that an engine of this era should be close to 130 psi cranking pressure, and in any case the 95 to 125 spread is pretty big.
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Old 03-13-2020, 01:23 PM   #3
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Looked up the compression ratio for a 59 220s engine, and 120 to 125 is probably about right. Just figure what is causing the spread.
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Old 03-13-2020, 11:59 PM   #4
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The high numbers are fine, but the spread isn't. Was this test done cold, or after the engine warmed up? A proper compression test should be done after the engine is warmed up.
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Old 03-14-2020, 08:58 AM   #5
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Originally Posted by gcd57 View Post
Can you help me determine if these compression results are good or bad?
The car is a 1959 Mercedes 220S Ponton with 120k miles

No. 1 was 125, number 2 was 100, number 3 was 100, number 4 was 95, number 5 was 110 and number 6 was 120.

Thanks
Are these numbers from a running engine or something that has not been run in several years? If it has not been run in a long time you should run it for a while and then check compression again while hot/warm.
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Old 03-14-2020, 10:21 PM   #6
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The old mechanic's rule of no more than 10% reading variation between cylinders is probably still a good barometer of engine health.
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Old 03-15-2020, 01:17 AM   #7
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Make sure the carb choke and throttle plate are full open prior to cranking.
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