Heheh.The base unit for pressure is pascals (Non-SI Unit)ġ x 0.068947572932 bar = 0.068947572932 Bars.Īlways check the results rounding errors may occur. Thank you for sticking in with the argument, but don't continue to test my backround and or persona, because I have an endless sea of engineer jokes to put out. I will have to email the publishers of the text and notify them of this error. Not only that, but the equations seemed legitimate as well. I assumed it was right, because it was published. It's hard to to believe that a numerical value is wrong, especially when it comes from a very valid source that has been printed and published. This is because 14.7psi x 0.9869 = 14.5psi The writer of the source I read must've been considering 1 bar = 1atm, which is close, but not accurate. Since 1 Bar is 0.9869 atm, then I now agree with you that 1 bar is 14.5psi. (bar) The bar nearly identical to the atmosphere unit. (atm) Normal atmospheric pressure is defined as 1 atmosphere. (psi, PSI, lb/in2, lb/sq in) Normal atmospheric pressure is 14.7 psi, which means that a column of air one square inch in area rising from the Earth's atmosphere to space weighs 14.7 pounds. To convert gauge pressure to absolute pressure you add the atmospheric pressure at the specific altitude you are at 14.7 psia is the correct atmospheric pressure at sea level. It's the absolute outlet pressure divided by the absolute inlet pressure. I like that fact that you mentioned pressure ratio since it's a very important parameter in turbo sizing. Go find any science book that shows conversion factors, or any online unit conversion site.I like this one: Btw, I am a mechanical engineer with a BSME and 40 years experience working with pressure vessels and I use bar and psi and other pressure units every single day. So I'll chalk your erroneous comment up to simple lack of knowledge on something that is very simple and basic science, and you probably just forgot it since you don't work with pressure units. I think I read here that you have a Master of Science degree pending? I hesitate to ask "what school" since it may just be an honest mistake on your part. There is zero doubt that 1 bar = 14.5 psi.
I hope all this information helped clear the understanding of those who thought that 1Bar=14.5psi.Ĭlick to expand.Hey bud, I don't take offense, but your comment is just funny.
This means that your car is consuming 177% more air than it could without the turbo. Lets say your boost gauge is telling you that you are hitting 2.77 bar. Example 1 had 1.82Bar and Example 2 had 3.59Bar. Here approximately 259% more air will be going through the system. In this example, approximately 82% more air will go into the engine than the engine could have consumed by itself.Įxample 2 (for 38psi of boost): PR = (14.7+38)/14.7 = 3.59 On another note: Have you guys played around with pressure ratios? I always thought those calculations were cool, especially considering it calculates the pressure in bar. The barometric pressure at mean sea level is 14.7psi. In case you didn't know, bar is short for barometric. Click to expand.I'm sorry my friend, but 1 bar is 14.7psi and you are wrong.
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