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SAFR Fuel Tuning


POWER SPORTS AND ELECTRONIC FUEL INJECTION GLOSSARY

OCTANE

A numeric rating of gasoline's resistance to detonation (premature ignition). The higher the octane number, the less chance of detonation. High octane (above 91) is usually worthwhile only if the manufacturer specifically recommends it. Octane is actually a hydrocarbon (C8H18).

OCTANE RATING

The octane rating defines resistance to pre-ignition in fuels for spark-ignition engines. Higher octane ratings indicate a greater resistance to knock. Two different procedures are in international use for defining octane ratings.

OILHEAD R-BIKES

Oilheads are BMW's answer to consumer complains when they announced they'd be killing off the R-bike line in the late eighties or early nineties. They realized they'd alienate a big chunk of their customers, but they didn't want to keep flogging the poor Airheads, which were no longer even vaguely modern bikes. The result was the Oilhead, which is an Airhead engine warped 20 years into the future. The term Oilhead comes from the fact that this engine type is oil cooled, and has oil flowing up into the heads. These engines really are drastically redesigned Airheads, with the basic layout being the real resemblance to the Airhead. Fuel injection is used instead of carburation. Engine control computers are normal on these bikes. New materials were used in the construction of the engine. The bike which goes around the engine is also different, with a greatly upgraded suspension, gearbox, clutch, appearance, etc.

ON BOARD DIAGNOSTICS

On Board diagnostics (OBD) monitors the Electric Control Unit and system responses for errors during normal vehicle operations. When the vehicle is serviced, this information on the errors can be down loaded and displayed to the service personnel which will facilitate the trouble shooting process

OPERATING DATA ACQUISITION

Sensors monitor all essential operating data to furnish instantaneous information on current engine operating conditions. This information is transmitted to the ECU in the form of electric signals, which are converted to digital form and processed for use in controlling the various final-control elements.

OPERATING DATA PROCESSING

The ECU processes the engine operating data received from the sensors. From this data, it uses the programmed ECU functions to generate the triggering signals for the fuel injector, the throttle valve actuator, and the canister-purge valve.

OXIDATION CATALYTIC CONVERTER

The oxidation catalytic converter operates with excess air, and employs oxidation, i.e. combustion, to convert hydrocarbons and carbon monoxide into water vapor and carbon dioxide. Oxidation catalytic converters provide virtually no reduction in nitrous oxides. With fuel-injection engines, the oxygen required for oxidation is usually obtained from lean induction mixtures. Carburetor engines rely on engine-driven centrifugal pumps or self-priming air valves to inject secondary air into the exhaust stream before it reaches the catalytic converter.


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