Which limiter limits the fuel and then the spark?

Which limiter limits the fuel and then the spark?

• A. Open Loop
• B. Stage Rev Limiter
• C. Fuel Rev Limiter
• D. Spark Rev Limiter

Answer: (C)

The concept being tested is how rev limiters control engine speed. A fuel rev limiter works by reducing or cutting fuel delivery as the engine approaches the limiter. With less fuel, the engine makes less power, so RPM can’t climb further. If the system needs additional protection beyond fuel cut, a secondary action can occur that affects ignition timing to further limit power. That two-step approach—first limiting fuel, then tightening ignition timing—matches the idea of a limiter that handles both fuel and spark, with fuel restriction as the primary action. The other options don’t fit this description as precisely: a spark rev limiter would only affect ignition timing, not fuel; open loop is a control strategy rather than a limiter type; a stage rev limiter implies a two-stage setup but the scenario described—fuel first, then spark—points to the fuel rev limiter as the one initiating the sequence.

The concept being tested is how rev limiters control engine speed. A fuel rev limiter works by reducing or cutting fuel delivery as the engine approaches the limiter. With less fuel, the engine makes less power, so RPM can’t climb further. If the system needs additional protection beyond fuel cut, a secondary action can occur that affects ignition timing to further limit power. That two-step approach—first limiting fuel, then tightening ignition timing—matches the idea of a limiter that handles both fuel and spark, with fuel restriction as the primary action.

The other options don’t fit this description as precisely: a spark rev limiter would only affect ignition timing, not fuel; open loop is a control strategy rather than a limiter type; a stage rev limiter implies a two-stage setup but the scenario described—fuel first, then spark—points to the fuel rev limiter as the one initiating the sequence.