CREATE TABLE table_70491 ("Year" FLOAT, "Chassis" CLOB, "Engine" CLOB, "Tyres" CLOB, "Pts. \\u2021" CLOB)

What year was the Honda ra168e 1.5 v6 t engine used?
SELECT "Year" FROM table_70491 WHERE "Engine" = 'honda ra168e 1.5 v6 t'
SELECT "Year" FROM "table_70491" WHERE "Engine" = 'honda ra168e 1.5 v6 t'