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Need more information whether the noise is constant or whether it varies with speed and / or load.
Could be piston slap (worn bores).
Does it smoke (oil smoke) after over-run?
A deep-down rumble under load could be mains, or (different conditions) big ends.
Get a broom handle and place one end against the block and the other against your ear (take care not to get caught in any rotating machinery of course). You should be able to locate the precise location (ie which cylinder(s) and how far up or down).
It might be detonation from a dribbling injector . . .
Last edited by G-CPTN; 11th September 2008 at 00:40.
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