Spark Advance Calculator
Calculate optimal spark advance timing for your engine based on RPM, compression ratio, and fuel type. Understand ignition timing principles and maximize engine performance.
Step 1: Engine Parameters
Understanding Spark Advance
Spark advance refers to how many degrees before top dead center (BTDC) the spark plug fires. Proper timing maximizes power while preventing engine knock. Higher compression ratios and RPM typically require more advance.
Step 2: Additional Options
About Ignition Timing
Higher octane fuels allow more advance before detonation occurs. Forced induction engines (turbo/supercharged) typically require less advance than naturally aspirated engines at the same compression ratio due to increased cylinder pressures.
Spark Advance Results
Recommended Spark Advance
Fuel Octane Comparison
| Fuel Type | Octane Rating | Max Safe Advance | Knock Resistance |
|---|
Timing Curve Visualization
Spark Advance Formula
Base Advance + RPM Factor + Compression Factor – Boost Penalty
Spark advance is calculated based on a base timing value (typically 10-15° BTDC), plus adjustments for engine speed, compression ratio, and fuel octane. Forced induction engines require a timing reduction to prevent detonation.
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