31. Since atmospheric pressure reduces as the aircraft climbs, power drops as a function of altitude in normally aspirated engines . 32. With the new rules, it was theoretically possible for large naturally aspirated engines to compete with small forced induction engines. 33. Combined with their normally aspirated engines and a higher downforce chassis, the IRL cars were able to handle the steep banking. 34. For 1987 only there would be the Colin Chapman Trophy ( for constructors of cars equipped with naturally aspirated engines ). 35. The mini-modified class is a highly specialized and custom built tractor to be fitted with a naturally aspirated engine , at minimum. 36. On a normally aspirated engine ( no turbo ) you might not improve things at all-and you could make matters worse. 37. The Classic was available with naturally aspirated engines ( as a front-wheel drive, with 4WD ) or a turbocharged option with. 38. GM has been an engine supplier in the IRL since the series introduced its naturally aspirated engine formula in January 1997. 39. The name 745i comes from the theoretical assumption that turbocharged engine have approximately 1.4 times more power than naturally aspirated engines . 40. The cars were powered by a Honda K20A naturally aspirated engine , built according to the FIA S2000 regulations with approximately 250 HP.
