An engineering marvel: Here’s why you should

consider a D-4D engine conversion.

The 1KD 3.0 L or D-4D (Direct Injection 4 Cylinder Common Rail Diesel) engine utilises Toyota’s Common Rail fuel injection technology, which operates at ultra high pressures of up to 135 mpa (1350 bar or about 19,580 psi). This is about eight times the pressure of conventional fuel injection systems within a “common rail”, which feeds the injectors on all four cylinders.

This is combined with a 32-bit ECU which controls fuel quantity, valve-timing, and boost pressure at different engine parameters resulting in best fuel economy and also full utilization of power during acceleration. In addition to fuel economy, the engine also offers full power utilisation during acceleration. Pilot injection is also utilised by the common rail fuel system to smooth engine operation.

The result? An engine that offers the same power and refinement you have come to associate with a petrol engine, but offers added benefits such as better fuel efficiency and lower emissions. Another feature of the electronic controls associated with the common rail is that there is no need to wait for glow plugs to warm up before starting the engine. You simply turn the key and the engine starts immediately.

Small amounts of fuel are introduced into the combustion chamber prior to the main injection event, reducing lag time and promoting more continuous and complete combustion. And in addition to this exterior and interior engine noise is also reduced.

Compared to the 1HZ 4.2 L engine with its underpowered 96 kW output the 1KD engine is a massive upgrade in terms of fuel economy to power ratio. It also produces 17% more power with 11% less fuel consumption than its predecessor, the 1KZ engine.

First appearing in 2000, the D-4D is a 3.0L(2982cc) straight-4 common rail diesel engine with a variable nozzle turbocharger (VNT) and Intercooler. It has 16 valves and a DOHC (double overhead camshaft) design. Its bore is 96 mm and stroke is 103 mm, it generates 122 kW at 3400 rpm, and 352 Nm of torque at 1800-3400 rpm depending on target market and emission specifications. In some markets, outputs are 127 kW /410 Nm and 140 kW / 420 Nm. And lastly the redline of this engine is 4200 RPM and its compression ratio 17.9:1.

Some say that Toyota’s legendary D-4D engine is one of the best fuel to power ratio diesel engines ever built and is a feat of an engineering marvel. We agree.


3.0L D4D Engine for your Land Cruiser

We’ve recently conducted a few tests on our Land Cruiser D-4D conversion and gladly share our results with you.All tests were done on the hub’s power and not the power of the flywheel (which is normally tested). The reason we test the hub instead is because it offers a more accurate reading.

The stage 1 results were as follows:

  • 137 kW
  • 460 Nm
  • Although we need a longer test run to achieve a more accurate fuel efficiency reading, our tests achieved a fantastic average of around 8.5 km/ℓ.

Interestingly enough a 4.2 1HZ tested on the same dyno delivered 68 kW and 230 Nm.

Book a test drive: Come and test drive and experience the difference the conversion makes by making a booking with Louis or Schalk.

The conversion will cost you R 150 000.00 (excluding VAT). We will keep your old engine (4.2) as payment for the conversion’s labour.

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