Volume correction due to temperature rise? 3

[slickstyles5]

Hi Guys,

I'll explain in detail... What I am doing is providing oil to an engine and then I want to measure the oil consumption. Prior to the test I will determine the volume1 and temperature1 (density1). After the test, I will determine the volume2 and temperature2 (density2). The problem is that the temperature at the beginning of the test is not the same as the temperature at the end of the test.

Can I use a simple relationship such as?

Actual Volume after test at initial temperature1 = Volume2 * (Density2/Density1)?

Basically I am converting my volume measured after the test to provide the volume at the initial density prior to the test so I can measure the actual consumption. I can't wait until the oil temperature to decrease, as this would cause too many delays.

Would this work?

Reference:

http://www.osti.gov/bridge/purl.cov...FEECAC11F489E7EC283E17?purl=/10179180-qGMb2h/

Thanks

Gabriel

 

[btrueblood]

Gale,

There is an issue in timing for measuring the oil loss. I.e. it takes a finite time, possibly many minutes, for the oil to drain back from galleries/heads into the sump before a volume measurement would stabilize. The same issue presents for filling the engine, i.e. how fully drained was it before being filled, were dead spots that don't drain back (e.g. oil filter) already prefilled with oil. Perhaps that is an issue that on a production line would be overcome by establishing a baseline measurement for a known "good" engine, provided the procedure is well controlled, and the drain-back time is not allowed to vary enough to scatter the measurement.

Weighing the engine would seem to be a good alternative. There might be issues if some components off-gas or "burn in" and lose significant weight in the process.

Would oil loss not show up in exhaust diagnostics?