8/8/2023 0 Comments 24v cummins high idleBut the real question is how much does it really matter? I mean the turbo compresses air anyways so does a little less atmospheric pressure really matter? Now as we all know there is less air the higher in altitude you go. When gauge pressure is referenced to something other than ambient atmospheric pressure, then the units would be pounds per square inch differential (psid). For example a bicycle tire pumped up to 65 psi above local atmospheric pressure (say, 14.7 psia locally), will have a pressure of 65 + 14.7 = 79.7 psia or 65 psig. The converse is pounds per square inch gauge or pounds per square inch gage (psig), indicating that the pressure is relative to atmospheric pressure. Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea level. Pounds per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Therefore, 1 atmosphere is approximately 14.696 pounds per square inch. Now converting the psi to standard atmospheres: Therefore, one pound per square inch is approximately 6894.757 Pa. It is the pressure resulting from a force of one pound-force applied to an area of one square inch: The pound per square inch or, more accurately, pound-force per square inch (abbreviations: psi, lbf/in 2, lb f/in 2,lbf/sq in, lb f/sq in) is a unit of pressure or of stress based on avoirdupois units. I am gonna quote some wiki info from to show how PSIA is caluclated You can figure out this number by doing some basic math seen below. We need to remember that at sea level there is about 14.7 psi of pressure in the air you breath. The princples work the same on a Cummins 24v vs common rail and powerstroke or duramax.įirst thing we need to look at why altitude plays a role. * Intake Manifold Temperature less than 60☌ (32☏)This Article covers the effect of being at higher altitude in a Turbo Diesel powered vehicle. * Coolant temperature is greater than 79☌ (175☏) * The automatic transmission is placed in gear (forward or reverse) This allows the engine to create increased heat in the cooling system, allowing more rapid warm up.Įither feature will abort when any one of the following occurs: Thus the engine has to work to overcome the three “dead” cylinders. If intake manifold temperature (IMT) is less than -9☌ (15☏), three of the cylinders will be shut off upon reaching 1200 rpm, creating a slight change in engine sound which is normal. * The Service Brake pedal is not depressed * intake Manifold Temperature less than 60☌ (32☏) Idle speed will slowly ramp up from 800 rpm to 1200 rpm when all of the following conditions are met: The repair procedure involves calibration software that will activate when certain parameters are met, reducing the chance of valve sticking as well as improving cab heat warm-up time. 9L Cummins diesel engine.Įxtended idle operation, especially in cold weather, can allow varnishes/oils to condense on the exhaust valve stems, leading to stuck valves, and damaged valve train components. This bulletin applies to all Ram trucks built after Decemequipped with the 24-valve 5. This bulletin involves selectively erasing and reprogramming the Engine Control Module with new software.
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