Low Compression
Discussion
E-bmw said:
I suspect you missed the bit where he said the low battery warning came on after trying to crank the engine several times tio carry out the compression test.
No - right back from the very start of the thread...klmorrell said:
Another thing that I thought unusual at the time of engine failure was , the battery low light came on, this is on a 12mth old silver series 800amp battery that was fully charged only days before. I know it could just be coincidence that the battery also died at the same time, but never-the-less it seems strange.
And later went on to say........
klmorrell said:
I'm sorry but, the light was a "low battery" light, meaning the battery was nearly dead.
the compression test was done with this battery fully charged, this is a 12mth old 760amp silver series battery, after the compression test the battery was down to 244amp
when he tried to rotate engine by hand it was too tight for a normal ratchet, he had to use an extension,
the engine is partially seized, and trying to start a partially seized engine or keep a seizing engine running will quickly drain a battery.
the compression test was done with this battery fully charged, this is a 12mth old 760amp silver series battery, after the compression test the battery was down to 244amp
when he tried to rotate engine by hand it was too tight for a normal ratchet, he had to use an extension,
the engine is partially seized, and trying to start a partially seized engine or keep a seizing engine running will quickly drain a battery.
E-bmw said:
And later went on to say........
Which - as I said at the time - makes zero sense whatsoever. It's throwing irrelevant and unmeasurable numbers around. 760 amps is a cold-cranking figure, the maximum the battery can delivery to a dead short. Nothing to do with the capacity - amp-hours or Ah - which would be somewhere around 100Ah at most.klmorrell said:
I'm sorry but, the light was a "low battery" light, meaning the battery was nearly dead.
the compression test was done with this battery fully charged, this is a 12mth old 760amp silver series battery, after the compression test the battery was down to 244amp
when he tried to rotate engine by hand it was too tight for a normal ratchet, he had to use an extension,
the engine is partially seized, and trying to start a partially seized engine or keep a seizing engine running will quickly drain a battery.
the compression test was done with this battery fully charged, this is a 12mth old 760amp silver series battery, after the compression test the battery was down to 244amp
when he tried to rotate engine by hand it was too tight for a normal ratchet, he had to use an extension,
the engine is partially seized, and trying to start a partially seized engine or keep a seizing engine running will quickly drain a battery.
Then there's the steaming ridiculousness of trying to do a compression test on an engine you can't rotate without serious force.
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