https://simanaitissays.com/2026/05/13/we-usta-hear-america-pinging/Simanaitis Saysen2026-05-13T13:05:00+00:00WE USTA HEAR AMERICA PINGINGSaab technical paper at SAE about its APC (with knock sensor), Saab Automatic Control System adjusts boost to avoid knock, MBT = minimum spark advance for best torque, Engine Octane parameters, U.S eliminated leaded gasoline in 1996 (after 26-year phaseout), World elimination of leaded gasoline 2021, tetraethyl lead is excellent antiknock agent (but lead is extremely toxic), ping is auto ignition at the wrong time and place in combustion chamber, ping isn't a big deal; extreme knock can melt piston heads, octane = resistance to knock, iso-octane hydrocarbon defined as 100 octane, n-heptane hydrocarbon defines 0 octane, today's gasolines: Regular (87 octane)/ Mid-grade (89-90)/Premium (91-94)https://simanaitissays.com/wp-content/uploads/2026/05/lede-3.jpeg?w=150https://simanaitissays.com/2026/05/12/hortus-deliciarum-the-garden-of-delights/Simanaitis Saysen2026-05-12T13:05:00+00:00HORTUS DELICIARUM—THE GARDEN OF DELIGHTS"Hortus deliciarum" "The Garden of Delights" Herrad of Landsberg 12th century, "Book of Esther" "The Authorized King James Version of the Bible", Jewish holiday Purim celebrates Esther's saving Persian jews, The Bible's Esther weds King Ahasuerus (Esth)er 2:7--2:17, Hohenburg Abbey aka Mont Sainte-Odile Abbey (home of Herrad of Landsberg), "Hortus deliciarum" 12th-century encyclopedia of knowledge (assembled by Herrad of Landsberg), "Hortus deliciarum" first polyphony in church music (hitherto monophonic Gregorian chant)https://simanaitissays.com/wp-content/uploads/2026/05/lede.jpg?w=150