Speaking of density altitude, in hot air and/or lower air pressure conditions, at 100F your density altitude would be more than 2000 ft even though you are at sea level, meaning the air density is the same as that at 2000 ft on a standard day.and you coolant system will only be as efficient as it would be at 2000 ft. Such conditions amplify cooling problems of a weak cooling system without extra capacity to handle not only the lower coolant boiling temp, but exasperated by the less dense air through radiator due to altitude and further thinned by high temperatures (density altitude). I live in Colorado and see cars boiling over while driving up steep mountain roads during summer. With a standard 15 psi cap and 50/50 coolant, boil over is mid 250F ish at sea level and decreases with altitude fast. 220 is max temp for use because 50/50 coolant will boil over at far lower temps at altitude.Ĭar engines are normally designed to run hotter than needed for reasons such as burning off more emissions and keeping the catalytic converter hot enough, so 200-210F is typical. Our ECM is a bit different, it has 2 ECMs for redundancy, but still controls a fan to regulate the 180-190F, but we typically reach 220F in climbs on hot days (full power, high nose up attitudes which decrease air volume into ducts, and slower speeds/air flow). Anything below 180 decreases ability to vaporize moisture on shorter engine runs. If we ran too low a pressure cap, the coolant would be quicker to boil over at a far less temp, so we run at cooler temps, about 180-190F, requiring a cooling system with more capacity to cool reserves (larger radiators, higher pressure cap pressure, ect). simple example is at 10k feet, it basically reduces your pressure cap by about 10 psi because you lose about 10psi ambient pressure. In an airplane, altitude, specifically the fast reduction in at atmospheric pressure with altitude, is a problem. OBD port indications will display correctly. Fact is the automotive industry programs their gauges to read at the 12 o’clock position or same position if temps are within about 20 degrees.this is left over from marketing efforts as owners believe there engine is better quality if it can maintain the temp exactly. this created a number of engineering issues, and cooling was one that we did a lot of testing.įirst off, drivers always say their engine temperature remains constant regardless of conditions. Not sure how helpful RE topic as my LS engine is in a Cessna, but. Please register or login to enable Dark Mode.Hot Rod Power Tour/ Pump Gas Drags/ Drag Week.Gen 5 Camaro Tuning, Diagnostics, Dyno results.
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