Different season, different fuel.
SEASON OF THE WHICH
I hear a lot about winter and
summer gas. What is it?
During the summer, pollution
is a frequent concern due to
increased levels of heat, smog and
ozone, which can harm the lungs.
Summer heat boosts the formation
of ozone, while the appearance of
an inversion layer—an immobile
layer of air—can trap pollutants in
the lower atmosphere. Thus, gas
stations carry a different fuel blend
in the summer than in the winter.
The difference between summer-and winter-blend gasoline involves
the Reid Vapor Pressure (RVP) of
the fuel. RVP is a measure of how
easily the fuel evaporates at a
given temperature. The more volatile a gasoline (higher RVP), the
easier it evaporates.
Winter-blend fuel has a higher
RVP because the fuel must be able
to evaporate at low temperatures
for the engine to operate properly,
especially when the engine is cold.
If the RVP is too low on a frigid
day, the vehicle will be hard to
start and, once started, will run
Summer-blend gasoline has a
lower RVP to prevent excessive
evaporation when outside temperatures rise. Reducing the volatility of summer gas decreases
emissions that can contribute to
unhealthy ozone and smog levels.
A lower RVP also helps prevent
drivability problems, such as
vapor lock on hot days, especially
in older vehicles. Summer-blend
gasoline contains approximately
2 percent more energy than winter-blend gas, thus gas mileage
is slightly better in the summer;
however, the summer blend is also
more expensive to produce, and
that cost is passed on to the consumer.
The switch between the two
fuels happens twice a year—once
in the fall (to winter blend) and
again in the spring (to summer
blend). Gas stations typically have
until June 1 to switch to summer
blend and then go back to winter
blend by September 15. ❏
THE FACTORY ADVANTAGE.
HAND-CRAFTED FOR YOU.Bo yesenEngineering boyesenfactoryracing @boyesenracing
S TOCK WATERPUMPS HAVE HARD EDGES AND INEFFICIEN T IMPELLER DESIGNS THAT IN TRODUCE AIR BUBBLES IN TO YOUR
ENGINE’S COOLAN T. AIR-CAVI TATED COOLAN T’S ABILI T Y TO REMOVE EXCESSIVE HEAT FROM YOUR ENGINE IS A PRIMARY FAC TOR
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AIR IN YOUR COOLANT IS CAUSING YOUR ENGINE TO OVERHEAT
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