Temperature and Lubrication of the Norton Motorcycle Engine
Download the complete PDF version using the green download button at the top right of this page for a detailed technical article examining engine temperature, oil breakdown and lubrication performance in Norton motorcycle engines. Originally published in the Norton Notice by Alan Goldwater, this resource combines real-world temperature measurements, oil cooler testing and laboratory oil analysis to explore how heat affects lubricant life under demanding riding conditions.
The article explains how Norton Commando cylinder head temperatures can rise sharply when airflow is reduced, especially after sustained high-speed riding, during slow traffic or when riding with a tailwind. It includes measured temperatures from the cylinder head, cylinder base, cam cover and oil intake, along with observations showing how quickly head temperature can climb during idling and low-speed operation.
Further sections compare different lubricant base stocks, discuss oil flash point and thermal stability, and review the effects of using an oil cooler. The article concludes with oil analysis results comparing oxidation and wear indicators across several oils after extended road use, making it a valuable reference for owners interested in oil choice, engine heat management and long-term lubrication protection.
Contents Include
- Norton engine temperature testing
- Cylinder head and oil temperature measurements
- Effects of airflow, traffic and tailwinds on engine heat
- Oil flash point and thermal breakdown discussion
- Comparison of petroleum, synthetic and ester oil types
- Oil cooler testing and measured temperature reduction
- Pushrod tunnel oil temperature observations
- Laboratory oil analysis and oxidation results
- Wear metal comparison between tested oils
- Lubrication recommendations for harsh riding conditions
