FENIX: CAP1021.Upgrade your cooling setup with a Fenix performance radiator cap.Rated to 1.1 Bar / 16 PSI, this radiator cap will raise the coolant pressure and subsequently its boiling point - increasing your cooling system's heat capacity and performance. In all actuality, the formula is: for every 2 PSI increase (at sea level) you increase the boiling point 1* above 212*. This means that a cap rated at 13 lbs. Or does it really make a difference? I've no idea what is listed for SBF. This Stant 10231 Radiator cap 16 PSI with a Vented in case of over presser. The radiator cap ensures that this pressure remains constant. Standard size caps fit 2-1/8" O.D. A slowly failing, worn out or faulty radiator cap can result in overheating, loss of coolant or even major engine damage. Standard size caps fit 2-1/8" O.D. High-performance caps range from 19 – 32 psi. ... raising the pressure at which your radiator cap releases is raising the boiling point of the fluid in your cooling system. How does an increase in pressure affect the coolant is boiling point? Radiator Cap. At sea level, water boils at 212 degrees. The new cap is 18 PSI (RC87 - part number 25713160), the old one for many vehicles was 15 PSI (RC75 - part number 10296465). Higher pressure caps can boost the boiling point even more. at atmospheric pressure, if exposed to 15 psi (a common radiator pressure cap), the boiling point will now be 45°F. If the pressure on the system drops because of a failing radiator cap, the boiling point … Higher cooling system pressure raises the boiling point of coolant to reduce the risk of overheating. The sudden decrease in pressure causes the boiling point to suddenly drop down, so that the entire contents of the radiator is suddenly boiling and spraying out all up in your face and all over everything else. A high-pressure radiator cap is used to raise the boiling point. But anyways, you should be fine with either the .9 or the 1.3 cap. x 3/4" deep necks unless otherwise noted. The radiator cap is often overlooked in common engine overheating problems. You could use a 15 or 16 lb cap, all cooling system components should be tested to say 30 psi. So the over-simplified answer to the tech quiz is that, yes, a higher pressure radiator cap can help prevent overheating. Traditionally radiator cap pressures are generally in the 6 to 15 psi range. That same mix at 16 pounds per square inch (psi) of pressure boils at approximately 250 degrees. Also, they raise the coolants boiling point, about 3-degrees F for each additional (psi) above atmospheric pressure. By increasing the pressure in the cooling system, the boiling point of the coolant is increased to 245 degrees Fahrenheit at 8 PSI. as the pressure and temp rise. I don't remember ever seeing a 16 pound radiator cap before (really high PSI in my mind), I was thinking 8-10 would be more appropriate. Otherwise I can't see any real reason they didn't use a more standard 15 psi cap. High-performance engines also create more heat. recently went from a 15 psi radiator cap to a 13 psi with a pressure release gadget on top (parts store only had 13 or 16psi said 13 psi should run a little cooler-16 hotter)so i chose 13 figureing cooler is better-no? However, straight water has a lower boiling point than a mixture. By adding 16 pounds of pressure to the system you will raise the boiling point … The radiator cap maintains system pressure to 16 pounds per square inch (psi) on most vehicles. Every PSI increases boiling point 3 degrees. Radiator Caps are designed to seal the top of the radiator filler neck to prevent coolant loss, pressurise the cooling system and raise the boiling point of the coolant. A faulty radiator cap can result in engine overheating, loss of coolant or major engine damage. Boiling point is rated at 133°C/271°F for Expert, and 136°C / 277°F for Factory Line, but only with a +1.5 bar (22 PSI) pressure cap! 50/50 mix with a 16 lb. Below are functions of radiator caps in automotive engines: A radiator pressure cap keeps the system pressure at 16 PSI, which avoids the coolant from boiling off even when it gets hotter considerably. I always knew opening a hot radiator cap was a bad idea, but I guess I never thought about it much in these scientific terms before. I have a buddy who's car would over heat in the texas weather. A radiator cap keeps the cooling system pressured which raises the boiling point. Higher pressures are used to increase the boiling point of the coolant under arduous conditions i.e. A faulty radiator cap can cause your car to boil-over at a lower temperature, but is an easy and inexpensive DIY repair. cap gives at least a 250 F boiling point. Water boils at 212° F, increasing the pressure in a closed system increases the boiling point. will increase the boiling point in a system by 39° F. High-performance caps range from 19 – 32 psi. Stant 10231 Radiator Cap - 16 PSI Vented. Radiator caps hold pressures between 6-16 PSI for most automotive systems. The radiator cap controls this expansion and provides constant pressure on the system. Cooling system pressures are controlled by the radiator cap. x 3/4" deep necks unless otherwise noted. Ford might have been afraid that 16 psi would burst the heater core or maybe the radiator(?). One function of the radiator cap is to keep pressure on the cooling system. The caps pressure rating varies by engine application anywhere from 13 – 16 psi. So you should be good to around 240 degrees depending on coolant boiling point. If your gaskets, hoses, radiator are in great shape, that pressure should keep it from puking out coolant when shut down hot. This protects the system from boiling over at the top of the operating temperature range. So, pressurized cooling systems help prevent overheating and coolant loss. A radiator cap is the part of a vehicle responsible for containing engine coolant and ensuring that the cooling system remains under pressure. Radiator Caps are manufactured using either metal or plastic design depending on the vehicle manufacturer’s specifications. of pressure raises the boiling point about 2 degrees, over 2 at 212 and a little less per lb. A faulty radiator cap can cause your car to boil-over at a lower temperature, but is an easy and inexpensive D-I-Y repair. Recovery system caps allow coolant to exit the cooling system into an overflow or recovery bottle as coolant heats and expands. The manufacturer told us that 20 psi would be no problem...it appears they were wrong. Which one do i need? A 20 lb cap will bring the boiling temperature of your coolant (water) to about 255 degrees. Ideally, car cooling systems should maintain a pressure of around 13 to 16 PSI. And the boiling point increases 2-3 degrees for each additional psi of pressure in the system. Coolant that is boiling cannot transfer as much heat and overheating is likely to occur. It is designed to add pressure to the cooling system and increase the boiling point like grandma's pressure cooker. I'm looking for a new radiator cap so as usual I go to look at Rockauto. Stant 10227 Radiator Cap - 13 PSI. My current radiator cap is a 13 psi cap and im looking at replacements that are either a 16 or 18 psi. At that point, the system is pressurized and helps control overheating and enhances system efficiency. For every pound of pressure in a closed cooling system you raise the boiling point by three degrees. ... Hi Luigi, 16 psi is 16lbs, the PSI is "Pounds per square inch" Hence a 16lb cap. The cooling system uses pressure to further raise the boiling point of the coolant. This is because for every pound of spring pressure, the boiling point is increased by 3° F. Water boils at 212° F, increasing the pressure in a closed system increases the boiling point. At higher elevations the boiling temperatures are all lower since atmospheric pressure is lower up here. That vacuum valve hangs down in the open position until the cap is subjected to rapid expansion of coolant or steam, which closes the valve in a sealed position. Whereas water boils at around 212°F. higher (3 psi times 15 psi cap). … GM has changed the part number for the radiator surge tank cap on vehicles that came from the factory with Dex-Cool. umm, hes talking about radiator caps not turbos. racing or desert conditions. Each lb. The radiator cap actually increases the boiling point of the coolant by about 45 F. Functions of Radiator Pressure Caps. To understand why the cooling system is pressurized, consider that for every 1 psi over atmospheric pressure, a liquid’s boiling point is raised 3°F. It is designed to add pressure to the cooling system and increase the boiling point. 7 lb cap will work just fine. Allstar Radiator Cap Small Stant 16 PSI ALL30124. Compare that with typical coolant boiling points in my graph on post # 5 (138°C with 50/50 mixture). For every pound of pressure exerted on the coolant in the system, the static boiling point of the coolant is increased by 3 degrees F. Keeping coolant in a liquid form allows the fluid to do it's job transferring heat to the radiator to be dissipated. And yes you should be running a 16psi/lb cap. ... all the 16 pound cap does is raise the boiling point of the water. ACDelco RC85 GM Original Equipment 15 P.S.I. A faulty radiator cap can cause your car to boil-over at a lower temperature, but is an easy and inexpensive D-I … Higher cooling system pressure raises the boiling point of coolant to reduce the risk of overheating. It is designed to add pressure to the cooling system and increase the boiling point like grandma's pressure cooker. Sunday at NHMS we epoxied the radiator back together, put a 16 lb cap on it, and ran cool all day long. Stant 10231 Radiator Cap - 16 PSI Vented. This allows the coolant to reach much higher temperatures without boiling away. I believe for a 383 2 barrel a 16 lb is the standard. I live at 6150' and a 13 psi cap boils at 250 for me. I'd suggest running a normal overflow recovery cap and tank and make sure the radiator is full when up to operating temp, fill the overflow tank to about 1/3 with coolant and call 'er good. With the 1.3 the higher pressure is going to circulate coolant coolant faster, so it will cool the motor better at higher speeds. 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