Triumph Stag (1970-1978)
The Triumph Stag, manufactured by the British Triumph Motor Company from 1970 to 1978, encountered persistent engine problems throughout its production lifespan. The issues stemmed from the necessity to adapt the engine to comply with California’s low octane petrol requirements and the ever-evolving emission regulations in the United States. To meet these standards, low compression pistons were installed, necessitating an advance in ignition timing. However, this adjustment led to increased engine heat generation, particularly exacerbated when the vehicle was equipped with automatic transmission and air conditioning. The compromised engine cooling capacity, especially evident in USA models, often resulted in overheating, particularly during freeway congestion situations. Despite attempts to mitigate the issue with engine cowls on USA versions, the Triumph Stag’s propensity for overheating remained a persistent challenge throughout its production cycle.
