Land Rover PT204 Engine Specifications and Performance

Here, we will examine the characteristics and characteristics of this engine, referring to the data of the PT204 turbo engine installed in the Land Rover LY2XCB Range Rover Velar [P300 | 2017/07 model].

PT204 type turbo engine specifications

LY2XCB type Range Rover Velar
Main specifications and driving performance summary
Vehicle modelDBA-LY2XCB type
car name & gradeRange Rover Velar
engine typePT204
kindsinline 4 cylinder
Inner Diameter x Stroke83.0mm×92.2mm
bore stroke ratio1.11
single cylinder volume498.8cc
Intake methodturbo
Fuel usedhigh octane gasoline
Maximum output300PS/5500rpm
Maximum torque40.8kgm/1500-2000rpm

First of all, the PT204 engine is a long-stroke engine with a bore (inner diameter) of 83.0mm, a stroke (stroke) of 92.2mm, and a bore-stroke ratio of 1.11 ( the stroke is larger than the piston diameter).

If the displacement and the number of cylinders are the same, the engine has better torque characteristics in the low rotation range than the short stroke type and is easy to handle. We are concerned about the decrease in output.

In addition, when the number of revolutions is the same, the average piston speed tends to be higher than that of the short stroke type, so the load on the engine tends to increase.

On this site, the models equipped with the PT204 type turbo engine are the first Range Rover Velar [LY2XCB type | 2017/07] released from 2017/07. A total of 2 models are registered.

Evaluation from transient characteristics and liter conversion horsepower

Image of engine performance curve
Pseudo engine performance curve diagram of PT204
Changes in horsepower85.4PS → 300PS
Transition of torque40.8kgm → 39.1kgm
liter horsepower150.38PS/L
liter torque20.4 kgm/L

The Range Rover Velar, which is the reference vehicle this time, has an in-line 4-cylinder 1995cc high-octane gasoline turbo engine that produces a maximum output of 300 horsepower at 5500 rpm and a maximum torque of 40.8 kgm at 5500 rpm.

If you know the horsepower and the number of rotations, you can know the torque, and if you know the torque and the number of rotations, you can know the horsepower. The torque at 5500 rpm is 39.1kgm.

The horsepower per liter of displacement is 150.38PS/L and the torque is 20.4kgm/L.

When applying the PT204 turbo engine to a 10-point evaluation based on the deviation value aggregated from all turbo cars registered on this site, the evaluation is [10] for converted horsepower and [10 ] for converted torque . It is categorized as a “high output engine to see “.

By the way, among the models equipped with the PT204 engine, the LY2XCB Range Rover Velar had the highest maximum output of 300PS/40.8kgm, and the smallest was the LY2XCB Range Rover Velar of 250PS/37.2kgm.

Increased displacement and compression ratio, change in bore-stroke ratio

Normal displacement and compression ratio
BoreStrokedisplacementcompression ratioB/S ratio
Increased displacement by increasing bore
Increased displacement due to increased stroke

There are three factors that determine engine displacement: the number of cylinders, bore diameter, and stroke volume.

Apart from whether or not it is actually possible here, the displacement is when the piston diameter is expanded from the stock 83.0mm to 86.0mm in 0.5mm increments, and when the stroke is extended from the stock 92.2mm to 97.2mm in 1mm increments. , and the change in compression ratio assuming that the combustion chamber volume does not change.

*It is easy to say that the stroke is increased, but in order to increase the stroke, a crankshaft and corresponding connecting rod are required. It is a menu that requires considerable preparedness to serve.

The B/S ratio is an abbreviation for the bore/stroke ratio, and as the bore diameter increases, the characteristics of the long stroke type will approach the square type or short stroke type. In the case of the PT204 type engine, if the bore is increased by +3.0mm from the stock piston, the ratio will change from 1.11 to 1.07.

Engines with similar piston diameters and increased displacement

There are 25 engines with pistons that are similar in size to the PT204 engine’s piston diameter of 83.0mm.

Eg modelpiston diameterdisplacement
Nissan M9R type84.0mm
Nissan CD20 type84.5mm
Mitsubishi 4G63 type85.0mm
Nissan VQ25 type85.0mm
Nissan RD28 type85.0mm
Mitsubishi G63B type85.0mm

As engines with similar piston diameters, Nissan: M9R type 1995cc 84.0mm installed in DNT31 X-Trail, Nissan: CD20 type 1973cc installed in SW11 Largo 84.5mm, Mitsubishi: Installed in CT9A Lancer Evolution IX. 4G63 type 1997cc 85.0mm, Nissan: 85.0mm VQ25 type 2495cc mounted on NM35 type Stagea, Nissan: RD28 type 2825cc 85.0mm mounted on WYY61 type Safari, Mitsubishi: Eterna type Eterna Sigma mounted on E15A type 85.0mm of G63B type 1997cc corresponds.

(Although there are fewer people who find pleasure in this kind of exploration anymore) No matter how close the diameters are, there are things such as the diameter of the piston pin, the height of the piston, and the convenience of the valve recess, so if possible, the same manufacturer, If possible, if you choose the same fuel and the same intake system, and if possible, choose something with a similar displacement, it may be more likely that you can use the stock.

Average piston speed

strokeMaximum torque
Maximum output
RPM/minper secondspeed

Next, let’s take a look at the average piston speed. The average piston speed at 5,500 rpm, when the 92.2 mm stroke engine generates maximum power, is 16.9 m/s , which translates to a speed of 16.9 meters per second (60.8 km/h at a speed of 60.8 km/h). is moving up and down.

The average speed is 18.4m/s when 4.6m/s is generated at 1500rpm, which generates maximum torque, and 6000rpm, which is 500rpm higher than 5500rpm where maximum output is generated, is assumed to be the rev limit.

For reference, I calculated the change in piston speed when a PT204 engine with a stroke of 92.2mm was rotated up to 10000 rpm. Looking at this, it seems that the speed increases by about 6.15 m/s every time the number of revolutions increases by 2000 rpm.

Considering only 20.0m/s, which is a standard for general engines assuming mass production, the upper limit of high rotation (regardless of whether it rotates or not) is mechanically about 6510 rpm . It seems to be good for both mentally and spiritually.

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