Need engine help

Information on the naturally-aspirated KA24E and KA24DE engines.
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Chezedik
Posts: 4726
Joined: Tue Dec 17, 2002 8:35 pm
Car: 1991 Nissan 240sx

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Just got finished rebuilding my engine again. Decided to do a quick compression test while I was only on one mount (in case I had to pull the motor later). With fresh rings (chrome top, cast iron second), filed, and the walls honed, stock cams and no intake mani it pulled 90psi dry. When I added a tablespoon of oil it pulled 240psi! This is only cyl 1, but I don't need to go any further if this is what I can expect. The starter sounds like it is turning slow, so I will charge the battery again. But it sounds almost identical when the battery is fully charged (I've done this a time or two). So I suppose that could explain the initial low compression number, and hydro-lock could explain the second high one. Or am I missing something? Can someone please tell me what this means?


bruinbear714
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Joined: Thu Sep 05, 2002 9:58 pm
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Compression test while the motor is bone dry and freshly rebuilt? It's low because the rings & valve stem seals haven't seated yet, and there isn't oil in the system.

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Chezedik
Posts: 4726
Joined: Tue Dec 17, 2002 8:35 pm
Car: 1991 Nissan 240sx

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You pretty sure about that? I have been told by some people that the motor is F'd. But I was thinking the same thing. I just don't want to finish putting it all back together to find out I need a new one. But if you are pretty sure, then I will roll full steam ahead.


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