* Engine Design: The specific engine's combustion chamber design, compression ratio, and fuel delivery system all significantly influence optimal timing.
* Gas Composition: The exact blend of gases in the natural gas fuel source will affect the burn rate. Different methane content, for example, requires different timing.
* Engine Load and Speed: The ideal timing changes with engine load and speed. What's best at idle will be quite different from what's best under heavy load.
* Altitude: Higher altitudes change air density, requiring timing adjustments.
Instead of a specific number, the ignition timing on a natural gas engine should be set according to the manufacturer's specifications or through proper engine tuning. This usually involves using specialized diagnostic equipment to measure combustion parameters and adjusting the timing for optimal performance, efficiency, and emissions. Improper timing can lead to decreased power, increased emissions, and even engine damage.
Attempting to set the timing without proper knowledge and equipment is strongly discouraged. It's best to consult a qualified technician experienced with natural gas engines.
