The Suzuki K engine family is a series of automobile engines from Suzuki, introduced in 1994. Displacements range from 0.7 L to 1.5 L. All engines have aluminium cylinder blocks with three or four cylinders in-line. Cylinder heads have two overhead camshafts, driven by chain, and four valves per cylinder. Fuel is gasoline/petrol, metered by multipoint fuel injection or direct injection. Some variants are turbocharged.
Since 2013, some of the K engines range have been upgraded with Dualjet technology.[2] The upgrades include new two injectors per cylinder, increased compression ratio (improving the thermal efficiency), redesigned water jacket shape, piston cooling by oil jets, water-cooled EGR system and several other changes for fuel efficiency.[3] The turbocharged variant with direct injection fuel system is called Boosterjet.[4][5]
Furthermore, a mild hybrid technology with 12 or 48-volt Integrated Motor Generator (ISG) dubbed as Smart Hybrid Vehicle by Suzuki (SHVS) is available for markets with stricter emission regulation, such as Europe, Japan, Singapore and India. This mild hybrid technology helps to increase fuel mileage, providing optional acceleration and also reduces emissions.[6][7] A strong hybrid variant with Motor Generator Unit (MGU) is available in Europe and Japan.
Three-cylinder
K6A
Suzuki K6A turbo with Jatco JF012E CVT transmission
This is the first K engine that appeared in 1994 and was discontinued in 2018. It is the smallest in the family and also the first K engine with VVT.[1] This engine was available in several versions, such as naturally aspirated, turbocharged, lean-burn, CNG and strong hybrid. The hybrid version was also the first hybrid engine in the kei car class and only available for Suzuki Twin.[8]
Technical specifications:
Displacement: 658 cc (0.66 L)
Bore and stroke: 68 mm x 60.4 mm
Valvetrain: DOHC, 12-valve, with or without VVT
Compression ratio: 8.4–8.9 (turbo), 10.5 (NA)
Maximum power:
37–54 PS (27–40 kW; 36–53 hp) at 5500–6500 rpm (NA)
60–64 PS (44–47 kW; 59–63 hp) at 6000–6500rpm (turbo)
50 PS (36.8 kW; 49.3 hp) at 6500 rpm (CNG)
Maximum torque:
55–63 N⋅m (6–6 kg⋅m; 41–46 lb⋅ft) at 3500–4000 rpm (NA)
83–108 N⋅m (8–11 kg⋅m; 61–80 lb⋅ft) at 3000–3500rpm (turbo)
The three-cylinder 1.0-litre version of K engine, fitted in many Suzuki's city cars since 2008. In 2014, this engine was reworked by increasing the compression ratio from 10.0 to 11.0:1 and known as K-Next. This changes claimed to increase the petrol mileage over 23km/L, achieved maximum power on lower rev and reduced frictional losses.[9] CNG variant also available for Indian domestic market.
Naturally aspirated K10C engine for European market Suzuki Celerio
Reworked version of K10B engine with naturally aspirated Dualjet or turbocharged direct injection Boosterjet technology. The compression ratio was increased from 11.0:1 to 12.0:1 for more thermal efficiency and reduced frictional losses. Suzuki's
SHVS mild hybrid system is available for this engine in European and Japanese market. The CNG version is also available for Indian market.
Technical specifications:
Displacement: 998 cc (1.0 L)
Bore and stroke: 73 mm x 79.4 mm
Valvetrain: DOHC, 12-valve, Single or Dual VVT
Compression ratio: 10.0 (turbo), 12.0 (NA)
Maximum power:
65–68 PS (48–50 kW; 64–67 hp) at 5500–6000 rpm (NA)
57 PS (42 kW; 56 hp) at 5300 rpm (CNG)
3 PS (2 kW; 3 hp) at 1000 rpm (electric motor)
99–111 PS (73–82 kW; 98–109 hp) at 5500 rpm (turbo)
Maximum torque:
89–93 N⋅m (9–9 kg⋅m; 66–69 lb⋅ft) at 3500 rpm (NA)
82 N⋅m (8 kg⋅m; 60 lb⋅ft) at 3400 rpm (CNG)
150–170 N⋅m (15–17 kg⋅m; 111–125 lb⋅ft) at 1500–4500 rpm (turbo)
Appeared first in 2008 and reworked with Dualjet technology in 2013.[2] In China, this engine was also used by Suzuki's former joint venture partners, Changan Suzuki and its subsidiaries. Known under E-Power EA12[10] or JL473Q[11] names.
Suzuki K12B Dualjet engine
Technical specifications:
Displacement: 1,242 cc (1.24 L)
Bore and stroke: 73 mm x 74.2 mm
Valvetrain: DOHC, 16-valve, VVT
Compression ratio: 11.0–12.0
Maximum power:
86–92 PS (63–68 kW; 85–91 hp) at 5500–6000 rpm
Maximum torque:
114–118 N⋅m (12–12 kg⋅m; 84–87 lb⋅ft) at 4400–4800 rpm
The Dualjet version of K12B engine and can also combined with 12-volt SHVS mild hybrid technology[12] or a strong hybrid system with Motor Generator Unit (MGU).[13][14]
Technical specifications:
Displacement: 1,242 cc (1.24 L)
Bore and stroke: 73 mm x 74.2 mm
Valvetrain: DOHC, 16-valve, Dual VVT
Compression ratio: 12.5
Maximum power:
90–91 PS (66–67 kW; 89–90 hp) at 6000 rpm
3 PS (2 kW; 3 hp) at 1000 rpm (mild hybrid electric motor)
14 PS (10 kW; 14 hp) at 3185–8000 rpm (strong hybrid electric motor)
Maximum torque:
120 N⋅m (12 kg⋅m; 89 lb⋅ft) at 4400 rpm
50 N⋅m (5 kg⋅m; 37 lb⋅ft) at 100 rpm (mild hybrid electric motor)
30 N⋅m (3 kg⋅m; 22 lb⋅ft) at 1000–3185 rpm (strong hybrid electric motor)
Replacing the previous K12C Dualjet engine for European (and several other markets), as the European emission standard has moved to Euro 6d stage. The displacement is the same as K12M and K12N Dualjet engines. The SHVS mild hybrid system is also standard.[12]
Destroked version of the K12B, developed by Maruti Suzuki. Mainly for the Indian market as the country imposed higher excise tax for petrol engines larger than 1,200 cc. This engine is also available for markets in South East Asia, South America and Africa.
VVT technology was added for this engine in 2012. In February 2018, the Dualjet version was introduced first in Thailand with higher 11.5:1 compression ratio.[15][16]
Technical specifications:
Displacement: 1,197 cc (1.2 L)
Bore and stroke: 73 mm x 71.5 mm
Valvetrain: DOHC, 16-valve, with or without VVT
Compression ratio: 10.5–11.5
Maximum power:
83–87 PS (61–64 kW; 82–86 hp) at 6000 rpm
71 PS (52 kW; 70 hp) at 6000 rpm (CNG)
Maximum torque:
108–113 N⋅m (11–12 kg⋅m; 80–83 lb⋅ft) at 4000–4400 rpm
2019–present Suzuki Baleno/Toyota Glanza (India) [Available for Mild Hybrid Delta and Zeta trims and without CVT option from 2019 to 2022 and all trims from 2023]
Boosterjet version of K14B engine with direct injection and turbocharger. This engine is no longer available since mid-2020 for European market and replaced by K14D Boosterjet mild hybrid engine.
Technical specifications:
Displacement: 1,372 cc (1.4 L)
Bore and stroke: 73 mm x 82 mm
Valvetrain: DOHC, 16-valve, VVT
Compression ratio: 9.9
Maximum power:
136–146 PS (100–107 kW; 134–144 hp) at 5500 rpm
Maximum torque:
210–230 N⋅m (21–23 kg⋅m; 155–170 lb⋅ft) at 1500–4000 rpm
This engine is similar as the regular K15B, but designed for commercial use. The differences are including different cylinder head cover made from metal with 7 bolts instead of resin material with 12 bolts on the regular K15B engine, different intake manifold position, shorter camshaft profile, lower compression ratio pistons, different timing chain cover design without engine mount (similar as previous generation Suzuki Carry) and different oil pan shape.[26]
Dualjet version of K15B engine, it is available in Europe and Japan with 140V strong hybrid combined to a Motor Generator Unit (MGU). Mild hybrid and CNG version is also available, the latter is only available in India.
Technical specifications:
Displacement: 1,462 cc (1.5 L)
Bore and stroke: 74 mm x 85 mm
Valvetrain: DOHC, 16-valve, Dual VVT
Compression ratio: 12.0-13.0
Maximum power:
100–103 PS (74–76 kW; 99–102 hp) at 6000 rpm
87 PS (64 kW; 86 hp) at 5500 rpm (CNG)
3 PS (2 kW; 3 hp) at 900 rpm (MHEV electric motor)
33 PS (24 kW; 33 hp) at 5500 rpm (HEV electric motor)
115 PS (85 kW; 113 hp) at 5500 rpm (petrol + HEV electric motor)
Maximum torque:
132–137 N⋅m (13–14 kg⋅m; 97–101 lb⋅ft) at 4400 rpm
122 N⋅m (12 kg⋅m; 90 lb⋅ft) at 4200 rpm
60 N⋅m (6 kg⋅m; 44 lb⋅ft) at 100-2000 rpm (HEV electric motor)
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