27-11-2018, 07:25 PM
Unless finished in place all shells are made with an exaggerated clearance at the parting line although it may not be obvious.
Many cars with shells ran without filters ie late s.v Minx. Some makes had shells with the w.m just a few thou thick but even with these, grade for grade, I doubt if embedibility for normal dirt was altered. Life is much extended with thin w.m
My stock Seven original crankshaft is about .001 out of round at 100,000 miles, nearly all that on oils of API SB rating or less.
In ages past pratice at overhauls was to significantly take up cast bearings and re scrape . This exposed clean new metal.
In my observation with various cars over the decades, for the same oil, debris in the oil is hugely related to ring gaps and to consumption and consequent carbon formation.
Many cars with shells ran without filters ie late s.v Minx. Some makes had shells with the w.m just a few thou thick but even with these, grade for grade, I doubt if embedibility for normal dirt was altered. Life is much extended with thin w.m
My stock Seven original crankshaft is about .001 out of round at 100,000 miles, nearly all that on oils of API SB rating or less.
In ages past pratice at overhauls was to significantly take up cast bearings and re scrape . This exposed clean new metal.
In my observation with various cars over the decades, for the same oil, debris in the oil is hugely related to ring gaps and to consumption and consequent carbon formation.