(BroBible.com)
Tuesday, August 1, 2017
The F Series Has Aged Very Well
On the 100th anniversary of Ford trucks, a brief look at their evolution
More pictures (AutoBlog.com)
More pictures (AutoBlog.com)
A Steady Way That Oil Companies Are Screwing Us
WHY IS A SUMMER BLEND OF PETROL A THING?
It’s not just here in California where different fuel blends exist. America has around 20 various blends of gasoline to meet state and federal guidelines. It turns out that when state and federal laws differ, making something for everyone gets complicated. The reason for the variation in blends comes down to controlling VOC’s (volatile organic compounds) relative to how likely they are to evaporate when they get hot. The more VOCs, the more smog we see. The Reid Vapor Measure (RVP) I mentioned on the podcast is the system used to measure the volatility in gasoline in terms of PSI (Pounds Per Square Inch). It measures the absolute vapor pressure exerted by a liquid at 37.8 °C (100 °F). The higher the RVP, the easier to it is to vaporize and the worse the effect on our environment. All gasoline blends have to weigh in under normal atmospheric pressure – 14.7 PSI . When that excessive heat of summer arrives, the RVP of gasoline has to drop lower so it doesn’t boil off. The EPA, while it still exists, mandates between 9.0 PSI and 7.8 PSI for summer grades. Because different states reach different extremes of summer they have their own blends.
(DriveTribe.com)
It’s not just here in California where different fuel blends exist. America has around 20 various blends of gasoline to meet state and federal guidelines. It turns out that when state and federal laws differ, making something for everyone gets complicated. The reason for the variation in blends comes down to controlling VOC’s (volatile organic compounds) relative to how likely they are to evaporate when they get hot. The more VOCs, the more smog we see. The Reid Vapor Measure (RVP) I mentioned on the podcast is the system used to measure the volatility in gasoline in terms of PSI (Pounds Per Square Inch). It measures the absolute vapor pressure exerted by a liquid at 37.8 °C (100 °F). The higher the RVP, the easier to it is to vaporize and the worse the effect on our environment. All gasoline blends have to weigh in under normal atmospheric pressure – 14.7 PSI . When that excessive heat of summer arrives, the RVP of gasoline has to drop lower so it doesn’t boil off. The EPA, while it still exists, mandates between 9.0 PSI and 7.8 PSI for summer grades. Because different states reach different extremes of summer they have their own blends.
(DriveTribe.com)
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