Engine Temp
HDF Community Team
Joined: Jun 2006
Posts: 12,763
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From: san antonio
I think the biggest thing that will affect head temps is going to be NOT running 14.7 AFR lean ... as the factory programs it ...
Adding fuel will cool the combustion chamber / head about as much as anything ...
I was mulling over what djl said above ... technically, it is true the heads are not 'oil cooled' ... however, oil flows through the rocker boxes which (as they are situated in direct contact with the heads) will act as something of a heat sink to draw heat from the heads ... if the oil flowing through the motor (and hence, the rocker boxes) is cooler by 10-20 degrees, I do not see why it would not have an ever-so-slightly favorable impact ...
However, big picture ... I think that once you've raised the compression ... the heads will run hotter and there is not a lot that can be done about it ...
R/
'Chop
Adding fuel will cool the combustion chamber / head about as much as anything ...
I was mulling over what djl said above ... technically, it is true the heads are not 'oil cooled' ... however, oil flows through the rocker boxes which (as they are situated in direct contact with the heads) will act as something of a heat sink to draw heat from the heads ... if the oil flowing through the motor (and hence, the rocker boxes) is cooler by 10-20 degrees, I do not see why it would not have an ever-so-slightly favorable impact ...
However, big picture ... I think that once you've raised the compression ... the heads will run hotter and there is not a lot that can be done about it ...
R/
'Chop
However, I would add this to the discussion. The oil flowing through the rocker boxes drips through; pull the rocker boxes and fire up the engine and see. It's not like the oil squirting from the pushrods of small block Chevy. In other words, the volume isn't high enough, IMHO, to have any cooling effect on head temp. Furthermore, if the oil does have a cooling effect on the head temp, doesn't it make sense to keep the oil as cool possible?
The function of the piston rings has also been overlooked in this discussion and most of the engine heat comes from the ring function. Aside from sealing the cylnder, another primary function is the transfer of heat from the piston to the cylinder and the cylinder fins catch wind and dissipate the heat; the cylinder is the heat sink. The cylinder transfers the heat to the heads, so the bigger the bore, the faster the piston speed, fuel octane and compression all contribute to head temps.
Most everyone runs the highest premium fuel available but if the engine runs fine on the next lower grade, no detonation, the engine will run cooler on the lower grade than it will on the higher grade.
So, if one is concerned about reducing engine heat, as Chop suggests, tune out the factory 14.7 AFR to a more reasonable level, add an oil cooler and run the lowest grade fuel that will not ping. JMHO.
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gliderman
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Aug 25, 2013 05:54 PM
