Mazda SKYACTIV-G 2.5 Specs: 89 x 100 mm (3.5039 x 3.9370 in), 184-191 hp

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Mazda SKYACTIV-G 2.5 specs: 2.5L (152 ci) 4-cylinder, 89 x 100 mm (3.5039 x 3.9370 in) bore and stroke, 13:1 compression. Rated 184-191 hp, 2014–2026.

The Mazda SKYACTIV-G 2.5 is undersquare — the 3.937" stroke exceeds the 3.5039" bore by 11.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.937" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.0 ci (623 cc).

13:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.

It is one of 19 engines in the Skyactiv-G family, sitting between the 91.3 ci and 201.4 ci members. 13 factory variants share these dimensions, rated from 184 to 191 hp across 2014–2026.

Dimensions

Displacement152 ci / 2.5 L
Bore3.5039"
Stroke3.937"
Cylinders4
ConfigurationI4
Compression ratio13:1
Bore/stroke ratio0.89

Construction

Block materialaluminum
Head materialaluminum
ValvetrainDOHC
Fuel typegas
Advertised HP184–191 hp
Years2014–2026

Factory ratings by year

YearVersionHP @ rpmTorque @ rpmComp.
2014SKYACTIV-G 2.5 net184 @ 5700185 lb-ft @ 325013:1
2015SKYACTIV-G 2.5 net184 @ 5700185 lb-ft @ 325013:1
2016SKYACTIV-G 2.5 net184 @ 5700185 lb-ft @ 325013:1
2017SKYACTIV-G 2.5 net184 @ 5700185 lb-ft @ 325013:1
2018SKYACTIV-G 2.5 net184 @ 5700185 lb-ft @ 325013:1
2019SKYACTIV-G 2.5 net186 @ 6000186 lb-ft @ 400013:1
2020SKYACTIV-G 2.5 net186 @ 6000186 lb-ft @ 400013:1
2021SKYACTIV-G 2.5 net186 @ 6000186 lb-ft @ 400013:1
2022SKYACTIV-G 2.5 net186 @ 6000186 lb-ft @ 400013:1
2023SKYACTIV-G 2.5 net191 @ 6000186 lb-ft @ 400013:1
2024SKYACTIV-G 2.5 net191 @ 6000186 lb-ft @ 400013:1
2025SKYACTIV-G 2.5 net191 @ 6000186 lb-ft @ 400013:1

Factory specification sheet.

What these numbers mean

Bore/stroke character0.890 — undersquare — stroke exceeds bore, which favours low-end torque
Mean piston speed at 6,000 RPM3,937 ft/min — in the range typical of performance street engines
Displacement per cylinder38.0 ci
Static compression13:1 — high enough that pump premium or better is normally required

Run the numbers for this engine

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Variants sharing these dimensions (13)

These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.

YearAdvertised HPCode
2014184 hpSKYACTIV-G 2.5
2015184 hpSKYACTIV-G 2.5
2016184 hpSKYACTIV-G 2.5
2017184 hpSKYACTIV-G 2.5
2018184 hpSKYACTIV-G 2.5
2019186 hpSKYACTIV-G 2.5
2020186 hpSKYACTIV-G 2.5
2021186 hpSKYACTIV-G 2.5
2022186 hpSKYACTIV-G 2.5
2023191 hpSKYACTIV-G 2.5
2024191 hpSKYACTIV-G 2.5
2025191 hpSKYACTIV-G 2.5
2026191 hpSKYACTIV-G 2.5

What cars have the SKYACTIV-G 2.5?

1 factory vehicle, 2014–2026. Each year opens that model's engine table.

Similar engines

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