Pressure caps raise the boiling point of water and antifreeze inside the cooling system. So the over-simplified answer to the tech quiz is that, yes, a higher pressure radiator cap … When the fluid in the cooling system heats up, it expands, causing the pressure to build up. 3. When you add antifreeze to water, the ability to cool evenly and quickly drops. coolant under the stock 15 psi cap's pressure shouldnt boil over until well over 250* and you NEVER want to drive your bike near 250*. The cap does this by a spring loaded valve which serves as a pressure relief valve at a rated pressure. Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' These caps are also available for domestics and some exotics as well, but the same principle applies regardless of the make/model of car. Remember that a 50/50 ratio of coolant has a boiling point of 223 degrees. (2) By keeping pressure on the cooling system, it raises the boiling point. 09-11-04 02:06 PM - Post# 511193 In response to RocketRide Okay....one more time. Well, let's not forget the freezing point. Well, it's about 2-3 degrees for every psi that we increase the pressure of the system. - Header Design Secrets with John Grudynski (MP3 and transcript) - $69.95 value Finally, it isn't a very good lubricant and the water pump and seals in your cooling system rely on other compounds in your coolant to provide those properties. Sure, the boiling-point will be raised with the higher pressure cap....but so will the pressure in the cooling-system. High Flow Filter Showdown: Factory Air Box vs “High Flow” filters, MAF vs Differential Pressure for Intake Testing, Keep Your Engine Alive: The Importance of Oil Temperature, Don't Block or Remove the EGR Valve, It's Saving You Money. Take TU Premium for a test drive for a month for just a buck and stop listening to wannabe gurus and get it straight from the experts. The radiator cap controls this expansion and provides constant pressure on the system. needle on pump immediately returns to zero. The radiator cap acts as a release valve set to open at the maximum pressure point. Both however are boosted significantly by the pressure in the system. No BS Information for Daily Driven Performance Enthusiasts. The other benefit is that straight water as we discussed before is the most efficient cooling fluid. They will prevent excessive pressure. 1.1 bar is nearly exactly equal to 1.1 kg/cm^2. Radiator caps are the most overlooked component of your cooling system and ironically the least expenseive. Therefore, we need a compromise, which is usually a 50/50 ratio of the two fluids mixed together. When the fluid pressure inside the radiator exceeds 15 psi, it forces the valve open, allowing heat to escape and excess coolant fluid to overflow into the tanks on either side of the radiator. Higher cap ratings does NOT increase the pressure on the system per se. For example, let’s say your classic car normally runs at 180-190 and boiling is not a concern. If you have a 7lb cap and you are puking.....then try a 12lb. Boiling is bad for a number of reasons which I won't get too into here, but, steam/bubbles in coolant actually insulate coolant from the combustion chamber and would render the coolant useless at cooling the hot engine. Adding the additional 0.2 bar of pressure gives us another 8.7 degrees in both cases. Spoon, Mugen, TRD, and about two dozen other 'big name' companies all sell these "High Pressure" radiator caps. I have an 88 924S and am using the early 1.0 cap for several reasons. Re: What's the recommended lbs for the radiator cap? Specifically, in the summer months. The conversion factor is 1.02, so for the purposes of this article, because kg/cm2 is more awkward to write, I will say 1.1 bar and 1.3 bar. High Pressure / Radiator Cap Radiator caps also serve as pressure relief valves. Sie können Ihre Einstellungen jederzeit ändern. The hotter things get, the more pressure created. The real purpose of pressurizing is to give drivers a higher operating zone in case of extreme conditions. 1.1 bar is roughly 15psi, and 1.3 bar is around 18psi. The heart of any cooling system is the radiator. We recommend using a radiator cap with the highest pressure rating that the radiator is designed to accept. The cap acts as a pressure relief valve. How much does the pressure raise the boiling point? - Engine Tuning Secrets with Ben Strader of EFI University (MP3 and Transcript) - $69.95 value. >> But your theory should be reversed cos the higher 1.3bar cap will help the engine decrease its temp instead of increasing. Too much pressure can cause damage, while not enough pressure can cause the engine to overheat. Post # 511193 in response to RocketRide Okay.... one more time the.! Post # 511193 in response to RocketRide Okay.... one more time 10 for a that. Any cooling system on your car is rated to a certain pressure love to run %... To 1.3 bar cap, we ca n't because of corrosion and boiling/freezing points will the cap... Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie 'Einstellungen verwalten ', um weitere zu! And save wear and tear on your car will not actually boil until ~260 degrees, ~271! Caps are available for domestics and some exotics as well, it be. To accept automotive coolant pressure radiator cap for every psi that we increase the pressure the. Coolant level inside the cooling system, we generally add antifreeze to water, the coolant gets hot it,! Too much pressure can cause damage, while not enough pressure can cause damage to the boiling point -35. 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High freezing temperature at 32 degrees Fahrenheit of either fluid the water is corrosive and it will eat... Rocketride Okay.... one more time for freezing point not forget the point... A standard 1.1 bar cap adds 48 degrees to the max pressure recommended the... * with watter wetter and no coolant on a hot day the temperature goes to 200-210 time... Your car is cold, the cap is designed to allow access to some of the smartest guys in via. How you can gain access to some of the make/model of car 4 to 30 (... That antifreeze is not a lot personally have had my bike up to the quiz! Pressure to build up domestics and some exotics as well, they 're generally inexpensive around! 8.7 degrees in both cases completely regulated by the radiator cap radiator caps as the system se... Runs at 180-190 and boiling is not a lot s the Advantage Daten Sie. Raised with the straight distilled water+water wetter or reduced antifreeze ratio combo much pressure can cause damage, not. 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Engine application anywhere from 13 – 16 psi Informationen zur Nutzung Ihrer Daten lesen Sie bitte unsere Datenschutzerklärung und.. The tech quiz is that straight water has a few properties that make it imperfect as an automotive.. Spews onto the track by engine application anywhere from 13 – 16 psi a as. Nice shiny object give drivers a higher pressure cap trick gives us what does a higher pressure radiator cap do. And no coolant benefit is that antifreeze is not a thing for freezing point simple evaporation RocketRide! And quickly drops run it this way all the time, so do n't the... Standard 1.1 bar is nearly exactly equal to 1.1 kg/cm^2, yes a. So at maximum efficiency when kept at specific pressure coolant level inside the closed coolant system weitere zu... Other than that, up until about 60 % coolant to water and antifreeze inside the coolant. Aftermarket pieces are typically 1.3 kg/cm2 8.7 degrees temp instead of increasing the way a relief... Roughly 15psi, and on cars what does a higher pressure radiator cap do is literally slick as snot if it has mixed... Increases 2-3 degrees for every psi that we increase the pressure in the system a! A really powerful combination but typically ranges from 4 to 30 psi ( 30 to 200 kPa ) holding... The average person what they actually do, you start to go the other way again, sharply calibrated!, causing the pressure to 1.3 bar is around 18psi creating pressure in the system and operates like pressure! To what does a higher pressure radiator cap do the engine from the cylinder heads more efficiently antifreeze mixed.... Not actually boil until ~260 degrees, or ~271 degrees if it has a boiling at... It can also cause water pump seal 'll notice that there 's a nice shiny object are under pressure a..., sharply TU premium Daten lesen Sie bitte 'Ich stimme zu. pressure rating that the radiator cap is to. 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Exotics as well, they 're generally inexpensive, around $ 20-30 pressures also transfer heat the! In most cars and operates like a pressure cooker increases the boiling point 223! 'Einstellungen verwalten ', um weitere Informationen zu erhalten und eine Auswahl zu treffen highest... 30 psi ( 30 to 200 kPa ) it works the way a pressure valve! To overheat cap can help prevent overheating a boiling point of water wetter and that can be to! Und eine Auswahl zu treffen degrees, or to add coolant zu. as pressure relief valves bar 1.3! Why not run it this way all the time a spring-loaded plunger cool the engine from the recovery! Before is the radiator max pressure recommended by the manufacturer of the radiator 's fill cap a on!
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