Toyota also had a 3.4L (3389cc) inline-sixgasoline engine from 1937 to 1947 that was also called the B engine. The earlier engine was used in early Toyota cars and trucks and in the first version of the Land Cruiser when it was known as the BJ Jeep. The later engine was used in later versions of the Land Cruiser. The two engines are unrelated and were not made at the same time.
Toyota made 5 generations of the B family engines, each one identified with a number before the B letter. Also, Toyota uses a series of letters to identify technical improvements to their engines:
- The number 1 (one) before the number of the engine model means that the engine uses direct injection, otherwise, indirect injection
- The F letter after the B letter means that the engine is multivalvular. Since the B family are inline-fours, that means that the engine uses 16 valves.
- The T letter, means that the engine is turbocharged
- The E letter, means that the engine is electronically controlled engine control unit (ECU)
For example, the 15B-FTE Engine is the fifth generation of the B engines, comes with 16 valves, is turbocharged, direct-injected and uses an ECU.
In August 1988, Toyota released re-designed B series engines (specifically the B, 3B and 11B) with a number of improvements. A mono-block design (with no cylinder liners) was adopted. An onboard, timing gear driven vacuum pump replaced a previously alternator-driven vacuum pump (Later a gear-driven power steering pump would be added to the 3B, 14B and 15B platforms). Camshafts gained larger bearing journals and roller lifters replaced earlier solid lifters. Pushrod inspection galleries disappeared to make a more solid engine block. The flywheel changed from 6 to 8 bolts and a PCV hose replaced the road draft tube. Toyota does not make a distinction in the naming of these engines, but in user communities the August 1988-on 3B is referred to as the '3B-II'.
The B is a 3.0L inline-four eight-valve OHVdiesel engine. Compression ratio is 21:1. Output is 80PS (59kW) at 3,600rpm, with 19.5kg⋅m (191N⋅m; 141lb⋅ft) of torque at 2,200rpm. Later versions claim 85PS (63kW) and 20kg⋅m (196N⋅m; 145lb⋅ft). Versions of the B made from August 1988 onwards are informally referred to as a 'B-II' and share the same engine block casting as the 11B.
The 3B is a 3.4L inline 4 eight valve OHV diesel engine. Compression ratio is 20:1. Output is 90hp (67kW) at 3,500rpm with 160ft·lbf (217 N·m) of torque at 2,000rpm. The 3B was offered with both in-line and rotary diesel injection pumps. Versions of the 3B made from August 1988 onwards are informally referred to as a '3Bii' and share the same engine block casting as the 14B. All post August 1988 3Bs have rotary diesel injection pumps.
The 4B is a 3.7-litre inline-four eight-valve OHV diesel engine of the swirl chamber type. The 4B was only sold on the Japanese domestic market. The 4B was released in 1999 at the time that production of the 3B ceased. Unusually, the indirect injection 4B was released considerably later than the equivalent direct injection 14B engine, which was released in 1988.
The 11B was released in 1985 and is a direct injection version of the original B engine. Power is 90PS (66kW) and max torque is 21.0kg⋅m (206N⋅m; 152lb⋅ft). In August 1988 an updated version of the 11B was released, similar to the informally named 'Bii' and '3Bii'.
The 13B is a direct injection version of the 3B engine. Output for 1985 versions is 100PS (74kW) and 24.0kg⋅m (235N⋅m; 174lb⋅ft).[2]
13B-T
The 13B-T is a turbocharged version of the 13B engine, with a compression ratio of 17.6:1. Output is 120hp (89kW) at 3,400rpm with 159ft·lbf (217 N·m) of torque at 2,200rpm. The later "LASRE" version has 130PS (96kW) at 3,400rpm and 30.0kg⋅m (294N⋅m; 217lb⋅ft) at 2,000rpm.[2]
The 13B did not receive the full suite of improvements in August 1988 that the B, 3B and 11B received. At this time, the 13B received an 8 bolt flywheel and larger camshaft, but retained cylinder liners and pushrod inspection galleries. All versions of the 13B/13B-T came with in-line injection pumps. Production of the 13B/13B-T ended in 1989.
The 14B is a 3.7 L (3661 cc) inline-four eight-valve OHV direct injection diesel engine.[3] Compression ratio is 18:1. Output is 98hp (72kW) at 3,400rpm with 177lb·fts (240 N·m) of torque at 1,800rpm. The 14B was launched in 1988 at the same time as the updated B, 3B and 11B. Unlike the 11B and 13B engines, the 14B did not evolve from an earlier indirect-injection engine. All 14B engines have rotary diesel injection pumps.
The 14B-T is a 3.7 L (3661 cc) inline-four eight-valve OHV direct injection turbocharged diesel engine. Output is 140 PS (103 kW) at 3400 rpm with 34.0 kg.m (333 Nm) of torque.
Yamaha marinised the 14B-T to make the Yamaha ME372 engine. Output is 165 hp (123 kW).
The 15B-T was supplied only to the Japanese Armed Forces. Based on a 14B-T, it is presumed to be bored out to a 4.1L (4104cc) inline 4 cylinder, eight valve, OHV, direct (mechanical) injection, intercooled, turbocharged diesel engine. It was found in the earliest versions of the BXD-10 Megacruiser before the 1995 release of the 15B-FT. Visually it is nearly identical to the 14B-T but can be distinguished by having no external piston-cooling oil nozzles as found on the 3Bii, 14B and 14B-T versions of the engine block. Both '3B' and '14B' castings are machined off the engine block replaced by a simple '15B' stamp, and a separate '15' casting behind the diesel injection pump. The 15B-T is the only 15B engine to have a Toyota CT26 turbocharger.
15B-F
The 15B-F is a 4.1L (4104cc) inline 4 cylinder, sixteen valve, OHV, direct injection diesel engine. Bore is 108mm and stroke is 112mm. Output is 86kW (115hp) at 3,200 rpm and 290N⋅m (214ft⋅lbf) of torque at 2,000 rpm.
The 15B-FT is a 4.1L (4104cc) inline 4 cylinder, sixteen valve, OHV, mechanical injection, turbo, intercooled diesel engine. Bore is 108mm and stroke is 112mm. Output is 101kW (136hp).
The 15B-FTE is a 4.1L (4104cc) inline 4 cylinder, sixteen valve, OHV, electronic direct injection, turbo, intercooled diesel engine. Bore is 108mm and stroke is 112mm, with a compression ratio of 17.8:1. Output is 114kW (153hp) at 3,200rpm with 382N⋅m (282ft⋅lbf) of torque at 1,800rpm.
The 1BZ-FPE is a spark-ignited equivalent to the 15B-F and fitted to LPG-fueled versions of the Dyna and the Coaster in selected Asian markets.
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