Originally Posted By: HTSS_TR
Originally Posted By: CATERHAM
Originally Posted By: mechtech2
Overfilling may INCREASE oil temps. The crank , rods, and pistons are shearing more oil. The film on the pistons/ bores/ and rings is the same with high or low oil levels. The temps there won't change. If any extra oil did get in there, it would result in more oil use, and probable carbon build up.
Don't agree.
Raising the oil sump level will reduce oil temp's, by both increasing the time it takes for oil temp's to rise and the maximum oil temp's acheived.
The disadvantage is a possible increase in oil aeration but that would be very much engine specific.
Common sense telling me that raising the oil sump level increases the time it takes for oil temp to rise to operating temperature, but I don't know it it will reduce oil temp or raising it.
Since oil temp's are not usually thermostatically controlled, maximum oil temp's are related to the heat imputs (throttle position) applied over time and limited by whatever cooling effect can be applied to the oil from external sources like cool ambient temp's, air flow over a finned aluminium sump, oil coolers and oil/coolant heat exchangers.
Especially during high speed driving when a lot of WOT is used, oil temp's will rise above normal and if one has less oil in the system not only will the temp's rise faster but utimately will rise higher. More oil in the system has a suppressing effect on both.
Originally Posted By: CATERHAM
Originally Posted By: mechtech2
Overfilling may INCREASE oil temps. The crank , rods, and pistons are shearing more oil. The film on the pistons/ bores/ and rings is the same with high or low oil levels. The temps there won't change. If any extra oil did get in there, it would result in more oil use, and probable carbon build up.
Don't agree.
Raising the oil sump level will reduce oil temp's, by both increasing the time it takes for oil temp's to rise and the maximum oil temp's acheived.
The disadvantage is a possible increase in oil aeration but that would be very much engine specific.
Common sense telling me that raising the oil sump level increases the time it takes for oil temp to rise to operating temperature, but I don't know it it will reduce oil temp or raising it.
Since oil temp's are not usually thermostatically controlled, maximum oil temp's are related to the heat imputs (throttle position) applied over time and limited by whatever cooling effect can be applied to the oil from external sources like cool ambient temp's, air flow over a finned aluminium sump, oil coolers and oil/coolant heat exchangers.
Especially during high speed driving when a lot of WOT is used, oil temp's will rise above normal and if one has less oil in the system not only will the temp's rise faster but utimately will rise higher. More oil in the system has a suppressing effect on both.