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300D Compression Test
Hi everyone,
I just purchased a rotted-out 1976 300D for next to nothing, as I need the engine for a 79 300D. The compression test was done cold and had values of 290-300-300-315-315. How good is this? I've read that some people do hot compression tests. Why is this? What should be the values for a cold and hot compression test? Thanks. Denis |
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I am unaware of the values for a cold test. The reason for the hot or rather warm test is that the metals naturally espand with the heat and this is actualy your true compresson when running I believe.
I could also be wrong but makes sense to me. I think your numkbers are a little low but the 315s arewithin spec. I would be concened about the 290 cylinder but again since this was cold that may not be a bad number.
__________________
'99 S420 - Mommies '72 280SE 4.5 - looking to breathe life into it '84 300SD Grey - Sold '85 300SD Silver - Sold '78 Ski Nautique |
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