Installation & Operation Manual
O-360 and IO-360 Series Engines
6 Chapter 3 • Aircraft / Engine
© March 2004 Superior Air Parts Inc. Integration Considerations
E. Fuels
Superior Vantage Engines are certified for
100LL Avgas per ASTM D910, 91/98 (lead
optional) Avgas per ASTM D910 and Motor
Gasoline with a minimum antiknock index
(R+M/2 method) of 91 per ASTM D4814. Higher
octane fuel improves the detonation margin
during high power and/or hot operation. When
operating on unleaded fuel, Superior
recommends using fresh, premium auto fuel
available at a major brand, reputable gas
station.
The use of auto fuel blended with alcohol
(ethanol) is forbidden. Winter oxygenated
ethanol fuel blends, or reformulated gasoline are
typically most available during the colder months
for smog reduction. Ethanol (alcohol) mixed
with unleaded fuel can cause vapor lock,
carburetor ice, reduction in range, carburetor
problems, and damage to the fuel system. The
use of an alcohol (and water) tester is
recommended. Acceptable gasoline is specified
per ASTM D-4814 (European EN228), again
without alcohol.
When running fuel lines for an airplane intended
for unleaded auto fuel operation, it is very
important to address issues that can reduce the
likelihood of vapor lock. For example, replace
90
°
fittings with smooth tubing bent to a larger
radius and do not use expansion or contraction
fittings. Locate the fuel boost pump as close to
the fuel tank as possible. Non-metallic fuel
system components should be manufactured
from materials that are known to be compatible
with auto fuels.