Toyota 8NR-FTS 1.2T Engine Specs, Problems, Reliability. The 8NR-FTS engine is a new member of Toyota’s NR household. It was presented in 2015 and became offering initially in the Toyota Auris, and later on as a choice for the Toyota C-HR. The 8NR-FTS is a 1.2-liter (one of the smallest in the NR-series) four-cylinder gasoline turbocharged engine equipped with direct fuel injection and it represents Toyota’s next step in thermal and fuel performance enhancement of internal combustion engines.
The launch of a new powertrain with the principle of a little displacement turbocharged engine (not for Kei cars readily available only in the domestic Japanese market) looks a bit late. Perhaps this is due to the desire of the Toyota to take a look at potential problems and successful services of other producers such as VW (1.2 TSI and 1.4 TSI EA111) and Ford (1.0 L EcoBoost).
The 8NR-FTS has a light-weight aluminum “open deck” cylinder block with thin cast iron liners merged into the block. The block has the water jacket spacer which enables more extensive coolant circulation near the top of the cylinder. The 8NR engine block likewise has extra horizontal support ribs on sides compare to NA engines of the NR series. Like other NR engines, the 1.2 l Turbo engine has actually the crankshaft moved by 8 mm relative to the cylinder axis lines. The engine got new crankshaft with 8 counterweights and T-shaped pistons with a resin finishing on skirts. The engine is equipped with piston-cooling oil jets managed by electronic devices.
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Toyota 8NR-FTS 1.2T Engine Specs, Problems, Reliability
There is an aluminum cylinder head with integrated water-cooled exhaust manifold to lower exhaust temperature. The cylinder head has 16 valves (2 intake and 2 exhaust valves per cylinder) and double overhead camshafts driven by the timing chain. Engineers seriously worked on intake ports created and attained a strong tumble circulation inside the cylinder which improved combustion speed. They likewise applied sodium-cooled valves. Valves itself are activated through roller rocker arms geared up with hydraulic lash adjusters. The exhaust camshaft also drives a vacuum pump for the brake booster and turbocharger control.
The intake camshaft drives the high-pressure fuel pump by an additional 4-lobes cam of the camshaft. The engine has Toyota’s VVT-I for the exhaust valve timing and VVT-iW (constant variable valve timing) for the consumption timing. On top of the head, there a cylinder head cover made from aluminum. The high-pressure fuel pump for direct injection is likewise connected on top of the engine. It delivers fuel to the created iron fuel rail under the pressure 2.4-20 MPa, and after that, straight into the cylinders by slotted nozzle injectors (a number of times at the cycle). The name of that Toyota’s fuel injection system is D-4T.
The 8NR-FTS utilizes a water-cooled single-scroll turbocharger with a classic wastegate valve control. The water-cooled exhaust manifold in the head allows cooling the exhaust gases prior to its getting in to the turbocharger what positively affects the sturdiness of that unit. The turbocharger has own cooling system with the independent circuit, radiator, and an electrical water pump. Charged air goes through a water-air type intercooler. The coolant circulation in intercooler is managed by electrical pump speed and controlled by ECM.
The Variable Valve Timing-intelligent Wide (VVT-iW) allows the engine to change between the Atkinson and Otto cycle: start in the Otto cycle; switch to the Atkinson cycle at low and mid-rev operation to lower fuel consumption; back to the Otto cycle at high engine rpm for more power. With the last loss-reduction innovations and enhancements in cooling and turbocharging, Toyota’s 1.2-liter turbo engine produces maximum thermal efficiency of 36% – among best results among mass-produced gasoline engines.
Toyota 8NR-FTS 1.2T Engine Problems and Reliability
The 1.2 T engine does not have a long report history yet to highlight significant issues/problems, but it appears that Toyota did an excellent task at the start. The 8NR-FTS delivers a vast array of torque and sufficient power for a small vehicle with low fuel consumption. It also produces heat which crucial for cold environments (a big problem for brand-new Honda’s 1.5 T engine which resulted in the service project after 2 years of production).
The 8NR-FTS is not a peaceful engine. It includes different sounds, specifically produced by VVT-i/W components. Some owners complain about the progressive oil consumption from the first miles. That can be discussed by love to eat oil at lower engine revs like mainly all brand-new turbocharged little engines do. The EGR valve rapidly becomes unclean. The cleansing procedure for EGR valve may be needed already at 20,000 miles mileage.
Toyota 8NR-FTS 1.2T Engine Specs
|Manufacturer||Toyota Motor Corporation|
|Cylinder block material||Aluminum|
|Cylinder head material||Aluminum|
|Fuel system||Direct fuel injection|
|Number of cylinders||4|
|Valves per cylinder||4|
|Bore, mm||71.5 mm (2.81 in)|
|Stroke, mm||74.5 mm (2.93 in)|
|Displacement, cc||1,197 cc (73 cu in)|
|Type of internal combustion engine||Four-stroke, turbocharged|
|Power, hp||114 hp (85 kW)/5,200|
|Torque, lb ft||136 lb-ft (185 Nm)/1,500-4,800|
|Engine oil weight||SAE 0W-20|
|Engine oil capacity, liter||4.0 (4.2 qt) – service fill
0.3 (0.4 qt) – oil filter.
|Oil change interval, mile||10,000 (15,000 km) or 12 month|
|Applications||Toyota Auris, Toyota C-HR, Toyota Corolla/Levin (China)|