Ignition Timing Calculator
Calculate optimal ignition timing for your engine. Understand how compression ratio, fuel octane, and engine modifications affect timing requirements.
Step 1: Engine Details
Understanding Ignition Timing
Ignition timing refers to when the spark plug fires in relation to the piston position. Advanced timing fires the spark earlier, while retarded timing fires later. Optimal timing maximizes power while preventing engine knock.
Step 2: Additional Options
About Ignition Advance
Ignition advance is measured in degrees Before Top Dead Center (BTDC). Higher compression ratios and octane ratings allow more advance. Forced induction and higher altitudes typically require less advance to prevent detonation.
Ignition Timing Results
Recommended Total Ignition Advance
Engine Timing Comparison
| Engine Type | Compression | Fuel Octane | Base Timing | Total Advance |
|---|
Ignition Advance Curve
Ignition Timing Formula
Total Advance = Base + Mechanical + Vacuum – Safety Margin
Ignition timing is calculated based on engine characteristics and operating conditions. Mechanical advance increases with RPM, while vacuum advance responds to engine load. The safety margin prevents detonation under adverse conditions.
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