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  #16  
Old 11-17-2010, 01:58 PM
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Quote:
Originally Posted by surveyguy View Post
thanks for all the advice, i don't know what is meant by "bar" because mine goes from 0-45 psi.

I guess the previous oil was bad, because i just changed it, and didn't notice i guess right away. before at idle it would be about 15psi. yesterday when it was warm, it did come off of 45 during idle.

thanks again.

Guy
that's the fairly rare Americanized version of the gauge. where yours reads 15 psi, 9 benzes out of 10 will read simply "1". At 30 psi on your gauge, we have a marking: "2". And at 45 psi, we have "3". A bar is a foreign unit of measurement corresponding to just under 15 psi. Maybe 14.7 or so.

I think I read in your original post that the car is a 70-something; back then I think the American ones did have psi markings on the instruments. By 1980, almost every Mercedes of any type had "bar" markings on the oil pressure, and degrees C instead of degrees F on the engine temperature.

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  #17  
Old 11-17-2010, 02:02 PM
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aha, i kinda thought that, just wondered if people were talking about the lines (bars).
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  #18  
Old 11-17-2010, 04:06 PM
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A metricspeek bar is about 15 lbs.
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  #19  
Old 11-17-2010, 06:13 PM
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Chemistry people use "atmosphere" as a unit of measure. "1 atmosphere" or 1 atm as it's abbreviated is somewhere right around 15 pounds per square inch. It's a decimal value; this isn't a precise conversion and anybody who blows up their workshop using that calculation, it's not my fault.

But I suspect that "1 atmosphere" in some German or European language would have something to do with *barometric* pressure or a barometer, thus 1 "bar" = 1 barometric pressure unit = 1 atmosphere = 14.7psi.

Probably. Sorry if this is obvious to everybody but somebody might search for this years from now and wonder.
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  #20  
Old 11-17-2010, 06:28 PM
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A "bar" is a unit of atmospheric pressure equal to 14.7 psi. One bar is about 15 psi, 3 bars is about 45 psi. Weathermen sometimes speak of barometer readings in millibars using numbers around 1000 but the term "bar" is rarely used in the US of A except by us old-Benz freaks.

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