23-09-2021, 10:40 PM
The ancient practice of warming cars up at idle before proceeding was discredited decades ago. Especially bad with pressure fed cars which toss little oil at idle (demonstarted by cars with worn gudgeons which rattle until momentarily revved). As bore wear is/was largely related to time cold it was found better to get underway and hasten warming of the cyl walls.
Between 1940 and 1957 my car wore .010 taper in 60,000 miles, typical of the time.
Even in the late 1960s cyl wear was much greater than moderns, but quite a lot of short cold running . By comparison my 1964 Minx .004 taper max in 170,000 despite long oil changes and non exotic oil. and a lot of blow by. Moderns typically less still.
Between 1940 and 1957 my car wore .010 taper in 60,000 miles, typical of the time.
Even in the late 1960s cyl wear was much greater than moderns, but quite a lot of short cold running . By comparison my 1964 Minx .004 taper max in 170,000 despite long oil changes and non exotic oil. and a lot of blow by. Moderns typically less still.