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 Definition of Reid Vapor Pressure 
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Joined: Fri Feb 08, 2013 5:50 pm
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Definition and test method.

"Reid Vapor Pressure is the vapor pressure of a chilled sample of gasoline or other fuel as measured in a test bomb at 100 F. The Reid Vapor Pressure differs from the True Vapor Pressure of the sample due to sample vaporization and the presence of water vapor and air in the confined space resulting from the Reid Vapor Pressure test method. To presaturate the sample for the Reid Vapor Pressure test, the streams are flashed at 1 atm and 33 F, and the resulting liquid product is then combined with air at the rate of 4 parts air and 1 part liquid. Next the system is flashed at constant volume at 100 F. The resulting gauge pressure is the Reid Vapor Pressure."

Fri Mar 27, 2015 2:14 pm

Joined: Sat Mar 16, 2013 7:58 am
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Is there an ideal RVP for racing fuel? Or, are there too many other factors involved when selecting fuel for a higher compression race engine? I have seen race fuel with RVP lower than 6 and some higher than 7. Bob J

Wed May 11, 2016 2:54 am
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Probably The biggest factor is the heat or sustained temp in the engine. For a NA or nitrous drag racing the higher the RVP the better the engines usually run, and the cooler temps the engine can be run at for improved performance. For a street or circle track engine you need to compromise because engine temps are higher. Similar for blown engines.

Wed May 11, 2016 9:14 am
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