Coolant flow

Getting back to stats: some of the books quoted might be 'antiquated'....but it doesn't matter because the way the stat operates has not changed since Adam was a boy.....

I have measured a lot of the 'hi flow' stats: Robert Shaw, Milodon, Mr. Gasket etc. probably all made in the same Chinese factory...
Reason I did some tests was that my engine ran very cool, too cool for my liking, was using the 160 stat. I used a digital temp probe for testing. What I found was that the stat opened at 160 [ all good so far...] & was fully open 20+* later. If the temp THEN dropped, it dropped to about 140* before the stat was fully closed again. The temp regulating mechanism inside the stat was either faulty &/or just not very accurate.
I now use the Stant SuperStat, which I also tested. Opens bang on the rating....& also closes bang on the rating.

I also have a Robert Shaw 140* stat. I presume it is for a marine engine or aircraft engine.