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The Toyota K series is an inline-four engine that was produced from 1966 through 2007. It is a two-valve pushrod engine design, a rarity for the company. It was originally built from the Toyota Kamigo plant in Toyota City factory in Japan.

Toyota K engine
Toyota 4K Engine in Toyota Corolla DX (KE70).jpg
4K engine in a Corolla DX
Overview
ManufacturerToyota Motor Company
Production1966–2007
Layout
ConfigurationNaturally aspirated straight-four
Block materialCast iron
Head materialAluminium alloy
ValvetrainOHV, two valves/cylinder
Combustion
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output45–83 PS (33–61 kW; 44–82 hp)
Torque output66–147 N⋅m (49–108 lb⋅ft; 7–15 kg⋅m)

All K series are non-crossflow engines – the inlet and exhaust manifolds are on the same side. They have cast iron blocks and aluminium alloy heads, with a crankshaft supported by five main bearings. K series motors have both hydraulic tappet or hydraulic valve lifters, solid lifters and 1.5 ratio rockers with an adjustment thread for tappet clearance. 7k engines were released with only the hydraulic valve lifters from factory, whereas 4k and 5k engines were made with both hydraulic and solid lifters (depending on year and which model vehicle.)

KEdit

 
1966 Toyota K engine

The 8-valve OHV 1.1 L (1,077 cc) K was produced from 1966 through 1969. A similar K-B was produced from 1968 through 1969, the -B designates twin carburettors. Thus equipped, the engine produces 73 PS (54 kW; 72 hp) at 6600 rpm.[1] The Publica SL received this more powerful version.

Applications:

2KEdit

The eight-valve OHV 1.0 L (993 cc) 2K was produced from 1969 through 1988. The cylinder bore and stroke was 72 mm × 61 mm (2.83 in × 2.40 in).

Output in 1978 was 35 kW; 48 PS (47 hp) at 5800 rpm, and 66 N⋅m; 48 lbf⋅ft (6.7 kg⋅m) at 3800 rpm.[2] In 1983, New Zealand received a version with 40 kW (54 PS; 54 hp) at 5800 rpm, while Europe received a version with 33 kW (45 PS; 44 hp) at 5600 rpm, both with a maximum torque of 66 N⋅m; 48 lbf⋅ft (6.7 kg⋅m) at 4000 rpm.

Applications:

3KEdit

 
Toyota 3K engine.

The eight-valve overhead valve 1.2 L (1,166 cc) 3K was produced from 1969 through 1977. Cylinder bore and stroke was 75 mm × 66 mm (2.95 in × 2.60 in).

The 1969 through 1975 3K-B was a twin-carburetor version. The California-spec 3K-C (1977–1979) and 3K-H were other available versions.

Applications
Specifications
Code PS kW HP at rpm kgm Nm lb-ft at rpm Compr. Ratio Comments
3K 68 50 67 6000 9.5 93 69 3800 9.0:1
55 40 54 (DIN)
3K-B 77 57 76 6600 9.6 94 69 4600 10.0:1 Twin carburettors, high octane
64 47 63 6200 9.0 88 65 4000 (DIN)
3K-BR 74 54 73 6600 9.5 93 69 4600 9.0:1 As 3K-B but for regular octane
3K-C 59 43 58 5800 8.7 85 63 3800 California emissions controls (SAE net)
3K-D 73 54 72 6600 9.6 94 69 4200 10.0:1 High compression, single carburettor
3K-H 71 52 70 6000 9.7 95 70 4200 9.0:1 High octane
56 41 55 6000 8.5 83 61 3800 (DIN)
3K-J[3] 64 47 63 5800 9.2 90 67 3600 Japanese emission controls for commercial vehicles
3K-HJ[3] 67 49 66 5800 9.4 92 68 3600 Japanese emission controls for commercial vehicles (Publica Van/Pickup, Starlet Van)
3K-U[3] 64 47 63 5800 9.2 90 67 3600 Japanese emission controls (TTC-C) ("Toyota Total Clean-Catalyst")

4KEdit

 
4K-U engine

The 1.3 L (1,290 cc) 4K was produced from 1977 through 1989. Cylinder bore and stroke was 75 mm × 73 mm (2.95 in × 2.87 in). It was an 8-valve OHV engine.

In 1980, the 4K produced 43 kW; 59 PS (58 hp) at 5250 rpm. From 1983 through 1984, output was 46 kW; 63 PS (62 hp) at 5600 rpm and 97 N⋅m; 72 lbf⋅ft (9.9 kg⋅m) at 3600 rpm.

The 1981 and 1982 California-spec 4K-C produced 43 kW; 59 PS (58 hp) at 5200 rpm and 90 N⋅m; 67 lbf⋅ft (9.2 kg⋅m) at 3600 rpm. Torque was up to 100 N⋅m; 74 lbf⋅ft (10.2 kg⋅m) at 3400 rpm for the fuel injected 1982 through 1984 4K-E. The Japan-spec 4K-U produced 55 kW; 75 PS (74 hp) at 5600 rpm and 105 N⋅m; 77 lbf⋅ft (10.7 kg⋅m) at 3600 rpm in 1982. Available in hydraulic and solid lifter configurations

Applications:

5KEdit

 
Toyota 5K-C engine in a 1991 Liteace
 
5K engine in a 1993 Toyota Kijang

The 1.5 L (1,486 cc) 5K was produced from 1983 through 1996. Typical output is 53 kW (71 hp; 72 PS) at 5600 rpm. Bore and stroke is 80.5 mm × 73 mm (3.17 in × 2.87 in). It was available with either 4- or 5-speed manual transmissions. Like the smaller 4K model, it uses hydraulic lifters as well as solid lifters for the pushrod.[clarification needed]

Applications:

7KEdit

 
7K-C engine in a 1996 Toyota Kijang

The 1.8 L (1,781 cc) 7K was first introduced in 1983. Cylinder bore and stroke was 80.5 mm × 87.5 mm (3.17 in × 3.44 in). Output was 60 kW; 81 PS (80 hp) at 4600 rpm and 139 N⋅m; 103 lbf⋅ft (14.2 kg⋅m) at 2800 rpm while the EFI version which can be found in Toyota Kijang KF80 produces 62 kW; 84 PS (83 hp) at 4600 rpm and 147 N⋅m; 108 lbf⋅ft (15 kg⋅m) at 3200 rpm. The Engine was available with a 5 speed manual & 4 speed automatic transmission. Available in both fuel injected and carburetted configurations, the 7K produces much more power and torque compared to the other K engines however it is a lot less 'rev happy' due to having such a large stroke.

7K-E is available in KR42 Townace SBV vans (1997–2007) using a large G52 5 speed gearbox (same bellhousing to box pattern as W55), or automatic.

Applications:

ReferencesEdit

  1. ^ 2代目 パブリカ [Second generation Publica]. トヨタ自動車75年史 [75 years of Toyota history] (in Japanese). Toyota Motor Co.
  2. ^ Tekniikan Maailma Magazine (in Finnish) (#15). 1978. Missing or empty |title= (help)
  3. ^ a b c トヨタオート [Toyota Auto] (catalog) (in Japanese), Toyota, June 1977, p. 13, 041183-5206
  4. ^ "5th Corolla Van". 75 years of history: Vehicle lineage. Toyota. Retrieved 2013-11-16.
  5. ^ List of RT140 Coronas sold in Japan. Toyota Motor Co., No. 261150
  6. ^ New Corona Van (Catalog), Japan: Toyota Motor Corporation, August 1985, No.121131-6008

See alsoEdit