Mazda 2.5 SkyActiv-G Engine Specs, Problems, Reliability. The 2.5 SkyActiv-G (the PY-VPR and PY-VPS) is 2.5-liter gasoline engine which was first of all introduced in the Mazda KE CX-5 and the GJ Mazda6 in 2012. This engine shares the exact same innovations and ideas which have actually currently existed with the 2.0 SkyActiv-G. But the 2.5-liter engine is not only bigger displacement engine, but it also has distinct functions.
To start with, SkyActiv 2.5 came to change the L5-VE engine. Like its predecessor, the brand-new engine has an aluminum alloy cylinder block with 4340 steel-molybdenum alloy bores. Also, this big four-cylinder SkyActiv-G engine has a balancer unit. It includes two the crankshaft gear-driven balancing shafts that rotated at two times the speed of the crankshaft. The block has bigger bore and stroke to supply the capability of 2488 cc.
All internal components are lighter and stronger now. There is a forged steel crankshaft, forged connecting rods, and aluminum pistons. The friction of the bottom end was reduced by 30 percent. The engine has cylinder head quite similar to the two-liter version. It made from aluminum-silicon, 2 overhead camshafts, 4 valves per cylinder, rocker arms which featured needle roller fans.
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Mazda 2.5 SkyActiv-G Engine Specs, Problems, Reliability
The 2.5 SkyActiv-G got variable valve timing system, Mazda’s ‘Dual Consecutive Valve Timing’ (Double S-VT). The fuel system was likewise updated. There is direct fuel injection system which injects fuel directly into the combustion chamber. The system consists of really productive high-pressure fuel pump and the injector nozzles with six holes for better air and fuel mixture. The engine marketed under the ‘SkyActiv-G’ label because of the unusual for gasoline engine compression ratio – 14.0:1 (13.0:1 for the United States, Canada, and Australia).
Another special function of this engine – it has stylish, long 4-2-1 header (exhaust manifold). This exhaust system 4-2-1 is designed to prevent the recirculation of hot exhaust gases and gas remaining inside the combustion chamber. This triggers drawbacks in ecological efficiency. The long distance between the engine and the catalytic converter makes exhaust gases cooler and not hot adequate to heat quickly the catalytic converter in first minutes of operation. At cold operation, The 2.5 SkyActiv-G engine raises the temperature of the exhaust gases by delaying ignition timing. The hot gases warm up the catalytic converter a much quicker.
Special note to the idle stop and restart system of the engine. Mazda’s i-stop used combustion as a part of idle stop system in combination with the electric-powered starter motor. The system can recognize which cylinder remained in the right stroke position, and after that sparks and injects fuel into the cylinder. That provides less wear on the starter motor and the best reboot times in the industry for the SkyActiv-G (0.35 seconds).
2.5 SkyActiv-G Engine Problems and Reliability
The brand-new Mazda 2.5 liter SkyActiv engine doesn’t have a long production history yet. In this short period, there are no meaningful problems and problems mentioned by cars and truck owners or the manufacturer. The SkyActiv series shows itself as a reputable and great engine with low fuel usage and maintenance cost for a mid-size sedan and an SUV.
you must see more engine detail in here: Engine – US Cars News or you can see on wiki here
Mazda 2.5 SkyActiv-G Engine Specs
| Manufacturer | Mazda |
| Production years | 2013-present day |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Direct fuel injection |
| Configuration | Inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Valvetrain layout | DOHC |
| Bore, mm | 89.0 (3.50 in) |
| Stroke, mm | 100.0 (3.94 in) |
| Displacement, cc | 2,488 cc (151.8 cu in) |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 14.0:1 (13.0:1 – the US, Canada and Australia) |
| Power, hp | 184-189 hp (137-141kW)/ 5,800 |
| Torque, lb ft | 185-189 lb-ft (251-256 Nm)/ 3,250 |
| Engine weight | – |
| Firing order | 1-3-4-2 |
| Engine oil weight | SAE 5W-30, 5W-20; SAE 0W-20 (USA, Canada) |
| Engine oil capacity, liter | 4.5 (0.2 – oil filter) |
| Oil change interval, mile | 12,000 (20,000 km)/12 months |
| Applications | Mazda CX-5, Mazda6, Mazda3 |
Mazda 2.5 SkyActiv-G Engine Modifications
SkyActiv-G 2.5 T – 2.5 liter turbo engine. 250hp/ 5,000 rpm; 310 lb-ft (420 Nm)/ 2,000 rpm. You can check out this engine here.
PY-VPR – SkyActiv-G 2.5 engine variation which powered the Mazda GJ Mazda6 – consisted of Mazda’s ‘i-ELOOP’ (Intelligent Energy Loop) brake energy regeneration system.
