엔진오일 교환 수리 사례

2026. 6. 30. 작업

난이도 & 준비물

증상

Would a non-turbo diesel perform better in high altitudes than a comparable gasoline engine?

처리 내용

Non-turbo diesels lose less power in the Rockies At least according to the SAE J1349 standard . (Calculations shown below) . Assumptions Dry air pressure in the Rockies = 90 kPa ( at 3000 ft) Absolute Temperature = 277.15 K ( 4 °C ) This allows us to compute the two quantities, A & B , that are used to determine the correction factors for both types of engines: A = 99 / p_PT = 99 / 90 = 1.1 B = T_P / 298 = 277.15 / 298 = 0.9300 For gasoline engines: Correction factor = A^1.2 * B^0.5 = 1.081 For naturally-aspirated diesel engines: Correction factor = A * B^0.7 = 1.045 This correction factor is used to determine the actual power made by an engine on a dyno after environmental variations are taken into consideration, it implies that the diesel engine loses about 4.3%¹ due to the altitude change compared to the 7.5%² power lost by the gasoline engine. Since 4.3% < 7.5%, diesel wins . The equations and explanation on how to use them are found in the Bosch Automotive Handbook . It's n