24-10-2018, 09:06 AM
A few random comments for what may be worth.
With a two bearing engine I dunno if crankcase rigidity much matters, except to reduce leaks and improve road holding!
A 1970 Crouse book reckons that above a water jacket temp of 115 deg F water evaporates from the oil, below accumulates in (Cannot see this applying exactly to all cars). Roller bearings esp sensitve to water.
The life of white metal bearings reduces with temperature. Cars into the 1950s tended to have large sump capacities despite modest power (Also prone to sludge and wear).Moderns with other bearings, and real multi grades, run at very high temps. I suppose that even with spit and hope the oil temp has some influence.
Cylinder and ring wear is reckoned to reduce to effectively nothing at full jacket temp.
With the urge of many owners to extend their Seven motors forever, I am surprised there has been so little about thermostats. Even Bradfords, devoid of fans, had. Of course big end life may not be prolonged.....
With a two bearing engine I dunno if crankcase rigidity much matters, except to reduce leaks and improve road holding!
A 1970 Crouse book reckons that above a water jacket temp of 115 deg F water evaporates from the oil, below accumulates in (Cannot see this applying exactly to all cars). Roller bearings esp sensitve to water.
The life of white metal bearings reduces with temperature. Cars into the 1950s tended to have large sump capacities despite modest power (Also prone to sludge and wear).Moderns with other bearings, and real multi grades, run at very high temps. I suppose that even with spit and hope the oil temp has some influence.
Cylinder and ring wear is reckoned to reduce to effectively nothing at full jacket temp.
With the urge of many owners to extend their Seven motors forever, I am surprised there has been so little about thermostats. Even Bradfords, devoid of fans, had. Of course big end life may not be prolonged.....