Flashpoint vs. oil/fuel dilution

[lewdwig]

If you started out with an oil with a flashpoint of, say, 424*F and you dilute it with gasoline that has a flashpoint of -49.9*F is the %dilution to flashpoint a linear relation? Are there tables/graphs for these properties?

I understand that some oil analyses use the %fuel dilution to determine the oil's flashpoint. Thanks in advance for any insight you can provide.

 

[mechtech2]

Don't forget to add alcohol to the equation, as it is in most fuels today!
Gasoline in engine oil evaporates quickly and goes away fast under normal conditions , if it is not replenished.

 

[SubLGT]

There used to be a graph here;

http://www.bobistheoilguy.com/forums/ubb...true#Post968030

 

[lewdwig]

Thanks. I tried clicking on the image block just in case it might work, but no. I had also tried BITOG searching and only got 4 pages, and I tried the Google "Bobistheoilguy:" search to no avail. So the question is still out there; how is flashpoint determined from fuel dilution?

 

[labman]

I don't know the answer but will add my ignorance to the pool. I have seen how some other related things things work, and they aren't linear. I think a calculation would be quite complex. On the other hand, if you have many samples, you could do it by what they call empirical methods. Run a bunch and plot them them on a graph. Do a little curve smoothing and you may have a fairly good chart if they correlate well. I wouldn't be surprised to see something such as alcohol throw off the correlation.

 

[SubLGT]

Originally Posted By: lewdwig
........ So the question is still out there; how is flashpoint determined from fuel dilution?


See this article;
http://www.oilanalysis.com/article_detail.asp?articleid=19&relatedbookgroup=Maintenance

 

[lewdwig]

Thanks!