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pruyter
Netherlands
320 Posts |
 Posted - 25 Aug 2017 : 09:41:54
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With a completely new engine the compression pressure should be 175/185 lbs which translates in 12.3 to 13 kg/square cm.
The difference between the highest pressure and the lowest should be no more than about 10%. In your case the difference between cylinder 2 and 3 is 20 lbs which calculates for about 15% when we take 140 lbs as a basis to calculate from.
If you experience no specific problem I should do nothing with it.
If you are interested to know what could be the cause of your observations than the following procedure gives you more information:
Run the engine to operating temperature;
Take out all spark plugs;
Put a tea spoon of oil in a spark plug hole and measure again;
Proceed with a tea spoon of oil until you have measured all 4 cylinders.
When the compression pressure is higher than the measurement without the tea spoon of oil then the problem can be related to pistons and/or piston rings.
If the compression pressure remains the same then most problably the valves are the culprit.
Regards,
Peter |
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1725 Compression test
