What are the differences between 7nr and 5nrfe?
2 Answers
Both the 7nr and 5nrfe engines belong to Toyota's NR series of engines, and there is essentially no difference between them. Below is an introduction to the classification of automotive engines: 1. Gas turbine: The working characteristic of this type of engine is that combustion produces high-pressure gas, which is used to drive the turbine blades to rotate, thereby outputting power. Gas turbines have a wide range of applications, but due to the difficulty in finely adjusting the output power, they are rarely used in cars and motorcycles. Only some racing cars have been equipped with gas turbines. 2. Jet engine: This refers to an engine that directly generates thrust by the high-speed jet of gas from the nozzle. It is widely used as the power unit for aircraft. Fuel and oxidizer undergo chemical reactions in the combustion chamber to release thermal energy, which is then converted into the function of adjusting the airflow in the nozzle. Engines that carry oxidizer in addition to fuel are called rocket engines, including solid-fuel rocket engines and liquid-fuel rocket engines.
As a mechanic with ten years of experience, I've worked on numerous Toyota engines. Although both the 7NR and 5NR-FE bear the NR designation, they're fundamentally different. The 7NR is a 1.5-liter engine (coded 7NR-FE) with a bore expanded to 72.5 mm, significantly more robust than the 5NR's 1.3-liter (72.0 mm bore). The power difference is even more pronounced—the 7NR delivers 107 horsepower, while the 5NR only musters 99 hp. The torque gap is even more dramatic: the 7NR unleashes 140 N·m at 4,000 rpm, providing noticeably better uphill performance. Anyone who's taken them apart knows the 7NR features reinforced connecting rods and a redesigned crankshaft. Common issues include more carbon buildup in the 5NR's throttle body, whereas the 7NR's fuel injectors are more reliable. Veteran drivers recommend prioritizing the 7NR, especially for frequent highway use.
