Engine Design

• The 1997 Wrangler's in-line four-cylinder engine had 2.5 liters of displacement, with a 3.88-inch bore, a 3.19-inch stroke and a compression ratio of 9.2-to-1. This engine had a maximum speed of 5,500 rpm and peak output of 120 horsepower at 5,400 rpm and 140 foot-pounds of torque at 3,500 rpm. This was 61 less horsepower and 62 less foot-pounds of torque than the in-line six-cylinder installed in the Sport and Sahara models.
  
  

Fluids and Fuel Efficiency

• The Wrangler's four-cylinder engine used four quarts of oil and took nine quarts of engine coolant. This motor ran on regular unleaded, 87-octane gasoline. Fuel efficiency was rated at 19 mpg in the city and at 21 mpg on the highway when equipped with manual transmission, while the engined fitted to an automatic gearbox yielded 17 mpg in the city and 19 mpg on the highway.