1HDT Vs. 1HDFT – Know The Difference

Toyota manufactures some of the most sophisticated vehicle engines in the automotive industry. 1HDT Vs. 1HDFT is a major contemplation when it comes to determining the most reliable engine for Toyota Landcruiser.

This article unveils the key distinguishing factors between the 1HDT and the 1HDFT engines. If you’re wondering which is better among the two engines, ensure to follow every piece of information in the subsequent sections of this article.

1HDT Engine

The 1HDT is a sophisticated diesel-engine designed with a couple of features that make it stand out among other engine types. The engine was designed with a straight-six configuration, having a direct injection system and a turbocharger.

The engine produces around 164 to 420 horsepower output and a torque level of about 316 to 430 Nm. This is an amazing record for the 1HDT engine. The engine was initially designed and used in the Toyota Landcruiser HDJ80. This 1hdt engine review reveals a lot of factors that distinguish the diesel engine from its counterparts.

Specifications

  • Manufacturer: Toyota Motor Company
  • Fuel type: Diesel
  • Fuel system: Direct injection
  • Turbocharger: Inclusive, along with an intercooler
  • Cooling system: Water-cooled
  • Cylinder bore: 94 mm (3.70 in)
  • Piston stroke: 100 mm (3.94 in)
  • Compression ratio: 18.6:1 and 18.8:1
  • Valvetrain: SOHC 12 and 24 valves
  • Displacement: 4.2 L (4,164 cc)
  • Configuration: Straight-six
  • Torque output: 361 to 430 Nm (266 to 316 lb.ft)
  • Power output: 164 – 420 horsepower
  • RPM range: 4,200

1HDFT Engine

The 1HDFT is a unique derivative of the 1HDT. This engine was manufactured after the release of the 1HDT engine. It is also a diesel engine type, with direct injection.

The engine was designed with a 24 valve SOHC turbocharged system, having 2 inlet and 2 exhaust valves, respectively, making a total of 4 valves on each cylinder.

This sophisticated diesel engine is known for its peak performance, providing a regular maintenance culture that is operational. The horsepower level speaks of speed and optimum performance in all ramifications.

This power output level competes with LS1 or LS6 engines that do not have more than 400 HP. The subsequent section displays the 1HD-FT specifications in detail.

Specifications

  • Manufacturer: Toyota Motor Company
  • Fuel type: Diesel engine
  • Fuel system: Direct injection
  • Turbocharger: Inclusive
  • Cylinder bore: 94 mm (3.70 in)
  • Piston stroke: 100 mm (3.94 in)
  • Compression ratio: 6:1
  • Valvetrain: SOHC 24 valves
  • Displacement: 2 L (4,164 cc)
  • Configuration: Straight-six
  • Torque output: 380 Nm (280 lb.ft)
  • Power output: 315- 420 horsepower
  • RPM range: 3,600

What is the difference between the 1HDT and 1HD-FT?

Although both the 1HDT and 1HDFT diesel engines are manufactured by Toyota Motor Company, they possess a few factors that easily distinguish them. If you’re wondering, “What is the difference between the 1hdt and 1hd-ft?” kindly consider the following factors below.

Features 1HDT 1HDFT
Power output 164 – 420 horsepower 315 – 420 horsepower
Torque output 361 to 430 Nm (266 to 316 lb.ft) 380 Nm (280 lb.ft)
Valvetrain 12 valves 24 valves
Compression ratio 18.6:1 and 18.8:1 18.6:1

Since the 1HDFT is more or less a derivative of the 1HDT; therefore, it was designed with improved capacity from the previous 1HDT spec.  If you’re looking forward to an increased horsepower and torque output, the 1HDFT engine is a better option than 1HDT.

FAQs 

Q: What is the difference between 1HZ and 1HDT?

The fundamental difference between 1HZ Vs. 1HDT is the combustion operation. The combustion process of the 1HZ indirect injection engine takes place in the combustion chamber around the engine cylinder head area.

Meanwhile, the 1HDT direct injection engine’s combustion takes place in the piston. Since the 1HZ injector injects straight (directly) into the engine’s pre-combustion chamber, there’s a great tendency for the cylinder heads to crack.

This is not so for the 1HDT engine. Since the combustion happens in the piston, away from the cylinder head, it is difficult for the cylinder head to experience a crack. Also, 1HZ injectors have a flat shape. Conversely, the 1HDT injectors come with protruding nozzles. The 1hdt engine fuel consumption level is relatively nice.

Q: How much HP does a 1HDT have?

A 1HDT has 164 – 420 Horsepower at 3,600 RPM. This engine comes with sophisticated features that make it outstanding, among others. However, the engine suffers from big-end bearing wear and pitting, which results in contact between the vehicle’s head and piston.

Although vehicle enthusiasts assert that a horsepower level around 200 – 300 HP is the optimum for cars, the 1HDT horsepower level is a good feat for drivers who do not necessarily seek road thrills as they drive.

Besides that, the 1HDT is an amazing engine. Irrespective of the power output benchmark, an LS3 or LS7 engine will deliver more horsepower than a 1HDT.

Q: Is the 1HD-FTE engine good?

Of course, the 1HD-FTE is an amazingly reliable engine type. This engine can deliver a power output up to 122kW at 3,600 rpm. It also delivers about 361Nm torque around 1,400 rpm. The engine is also pretty much easier to maintain.

You’re good to go with regular engine oil and oil filter changes around an interval of 5,000 km. However, all vehicles need a regular maintenance culture to stay active delivering top-notch performance and efficiency.

The 1HD-FTE is not an exception in this case. Nevertheless, it is pretty easier to maintain than the latest V6 or V8. So, if you own a car with a 1HD-FTE, stick to the regular maintenance interval, and you’ll enjoy the engine’s awesome performance for a long time.

Q: How much boost can a 1hdt handle?

A 1HDT can only handle around 11 to 12 PSI boost at maximum. This will help keep the engine reliable, as the turbo cannot cope very well with a PSI boost more than necessary. So, it would be best to stick to this recommendation.

Although a turbo boost can increase a vehicle’s engine power, it is important to note that sometimes more turbo boost may not necessarily be more power for the engine.

Turbochargers are expected to deliver around 6 – 8 PSI as the approximate optimum pressure boost level for a car. Also, note that excessive boost can result in unexpected turbo or engine failure.

Q: Is 1hdt common rail?

No, the 1HDT does not have a direct fuel line system designed to receive fuel from the pump and deliver it under high pressure to the injectors. The 1HDT uses a regular mechanical low-pressure pump. The fuel supply runs from a low-pressure level to a high-pressure level.

However, the engine’s injector timing is controlled electronically. The engine requires a timing belt around 150,000km intervals.

The 1HDT is devoid of the limitations of a common rail engine, including; high sensitivity to fuel quality and impurities, high repair cost, as well as more frequent fuel filter replacement.

Q: What year did the 1hdt come out?

The 1HDT is on the 1990 – 1994 80 series. The engine was designed with 12 valves, 4.2 liters capacity with 4,164 cc. It has direct injection and a turbocharged straight-6 SOHC system. The engine has 94 mm × 100 mm bore and stroke, respectively.

The engine also includes an 18.6:1 compression ratio and 164 horsepower output around 3,600 rpm, and a 361 Nm torque level around 1,400 rpm. The engine was designed and fitted into the Toyota Landcruiser HDJ80 from 1990 to 1995.

Q: What car has the 1HD FTE?

The 1HD FTE was fitted in the Toyota Landcruiser HDJ100. It is a 6-cylinder turbocharged 4.2-liter diesel engine. It was designed with a sophisticated cast iron construction, a direct injection system, a single-head overhead camshaft, and a 4 valves cylinder.

The Landcruisers HDJ100’s 1HD FTE was a derivative of the 1HDFT engine; however, Toyota introduced a creative injection pump system that is electronically controlled and an intercooler.

This engine was known for its topnotch performance inspired by its 151kW power output at 3,400 rpm and torque delivery of 430 Nm at about 1,400 to 3,200 rpm. If you were contemplating 1HDT Vs. 1HD FTE, ensure to determine the fundamental specifications of both engines in order to compare them.

Final Words

Differentiating 1HDT Vs. 1HDFT is more about the vehicle engines’ specifications of features than the manufacturer of the products. While they both come from a particular manufacturer – Toyota Motor Company, the two engines have a couple of variations.

Therefore, it is pretty easy to identify the engine with a better horsepower or torque output, as unveiled above in this article. So, if you’re having a hard time convincing someone about the best engine between these two, kindly recommend that they read this piece of information.

Osuagwu Solomon

Osuagwu Solomon is a seasoned automotive technician for the past 9 years, and a technical writer. He loves writing about auto professional repair guides, DIY repair guides, and buyer’s guide. After spending six years in the automotive workshop, he decided to impact his knowledge to people aside his domain, and he has achieved this by centering his Automotive writing skills on REPAIRS.

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