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Keep in mind that most boiling, if any, will occur in hot spots in the heads or block. Even though the coolant in the radiator and hoses may not be boiling, it very well may be boiling at the hot spots around the exhaust valves. The higher pressure radiator cap will enable the temperature to rise during heavy load/high ambient without the entire coolant load boiling. The higher pressure will suppress boiling at hot spots. BTW, from a heat exchange standpoint, those liquid to air heat exchangers behind the grilles of our 300’s (and other lesser vehicles) are more convectors than radiators. That’s why those HEX work so well when the car is moving and airflow across and through them is high. My 300’s do not like a parade. Added electric fans = more air flow at low speed over terrain. The point made that restricting the differential pressure between inside the radiator to the atmospheric pressure will reduce thermal and mechanical stress on all elements of the system is valid. The radiator portion of the system is designed to hold this pressure with a significant safety pressure unless it is damaged by corrosion or impacts. If your trips don’t expose your car’s cooling system to heavy loads and/or high ambient temperatures and/or slow traffic speeds you might extend the service life of the radiator by using a lower pressure cap. Finally, an internal combustion engine will be more efficient when operating at higher temperatures. Newer engines are designed to run lean and hot all the time in order to maximize efficiency and reduce “pollutants”. Lecture concluded. Take out yellow paper and number 1-10. Prepare for a pop quiz. Rich Barber, Professional Engineer Emeritus, BSME Don’t think about how that is abbreviated. Thankful that the fire fighters are getting control over the fires and that the loss of lives won’t be in the hundreds—even as another fire broke out south and west of us in the Santa Cruz mountains, way south and west of Brentwood and near Sausalito—at the north end of the Golden Gate. A little rain may come tomorrow night and it will be welcomed. From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'John L. Chesnutt' chesnutt@xxxxxxxxxxxx [Chrysler300] Hi, __._,_.___ Posted by: "Rich Barber" <c300@xxxxxxx> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to https://groups.yahoo.com/neo/groups/all/manage/edit For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang __,_._,___ |
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