Why Cant Diesel Engines Rev High?

The first reason is that the compression ratio is substantially higher. This is the ratio between an engine’s cylinder’s greatest and minimum volume. It’s bigger in a diesel engine because the piston moves up and down a larger internal volume of the cylinder due to the longer stroke. Diesel engines never rev as high as petrol engines because the piston has to travel further for a complete rotation, whereas a petrol engine uses its shorter stroke to move the piston in shorter bursts, resulting in a faster engine speed.

Upgrade the Air Intake

Improving the airflow to the engine is a surefire technique to boost a diesel vehicle’s performance. More air will reach the engine using an enhanced air flow kit, resulting in increased power.

In addition, the new airflow kit will pull air from outside the engine compartment, bringing colder air in. The amount of power produced by the engine will rise because cooler air is denser and holds more oxygen.

An enhanced air flow system can boost horsepower while also improving fuel economy.

Change or Reprogram the ECM

Engine performance is controlled by the Engine Control Module (ECM), which alters critical engine parameters such as the air-fuel mixture and maximum RPM.

You may easily change these settings by reprogramming or changing the ECM. This will allow the engine to create more horsepower and torque, which will increase performance.

ECM upgrades not only increase power, but they also help to increase diesel efficiency.

Using New Fuel Injectors

The next step is to upgrade the fuel injectors if you’ve improved the air flow to the engine and set up the ECM to produce additional power.

More fuel will reach the engine thanks to new fuel injectors, resulting in increased horsepower. Individual injector nozzles are found on most performance fuel injectors, which provide higher pressure and better atomize the fuel.


Adding extra power to diesel engines using a performance turbocharger is a wonderful way to do it.

The turbo operates by pressurizing the air intake and forcing additional air into the engine. It is possible to generate more power while improving engine efficiency by using a turbo.

In comparison to a non-turbo engine, a stock turbo boosts air flow three to four times. A performance turbo, on the other hand, can enhance airflow by five to ten times over a non-turbo engine, resulting in a bigger horsepower boost.

Performance Exhaust

You’ll need to update your exhaust system if you want to increase the engine horsepower.

Unlike factory exhaust systems, which are designed to reduce noise, a performance exhaust system will have a wider diameter and fewer bends, allowing for more exhaust flow.

A broader, straighter exhaust system will help reduce exhaust gas temperature and boost the engine’s horsepower and torque.

Is the 2.8 Duramax an Isuzu?

DMAX Ltd., a joint venture between GM and Isuzu, will invest $60 million in the Duramax diesel engine factory in Ohio to make design adjustments to satisfy future emission requirements.

Since opening in 2000, DMAX, which was founded in 1998, has manufactured about 1.6 million engines. Isuzu holds 40% of the joint that makes the Duramax diesel for heavy-duty vehicles, while GM owns 60%. Approximately 500 jobs will be retained at the engine facility as a result of the investment.

The Duramax 6.6L turbo diesel engine found in the Chevrolet Silverado and GMC Sierra is made by DMAX. The Duramax is also available in full-size vans like the Chevrolet Express and GMC Savana.

At 3,000 rpm, the new Duramax produces 397 horsepower (296 kW) and 765 pound-feet of torque (1,037 Nm) at 1,600 rpm. A 2,000 bar piezo-actuated fuel system is standard on all Duramax engines.

Next year, GM is scheduled to debut a 2.8-liter turbo diesel engine for the Chevrolet Colorado and GMC Canyon mid-size pickup trucks.

Do diesel engines have rev limiters?

A rev limiter is installed in any car with an ECU, whether it is petrol or diesel. Mechanically regulated diesels do not have rev limiters and will continue to rev until a portion of the engine can be seen protruding through the bonnet.

Do short trips hurt diesel engines?

Short excursions do not allow the diesel engine to warm up sufficiently to remove deposits and prevent carbon accumulation and combustion. That’s all there is to it. To get it up to temperature, you’ll need at least 15-20 minutes of loaded running and at least 1 hour of highway travel per month to keep it happy.

Petrol vs Diesel : Performance Compared

Diesel engines are often heavier than gasoline engines, making them slower. Because diesel has a greater flash point (temperature at which it catches fire) than petrol, the compression ratio of diesel engines is substantially higher. For diesel engines, the compression ratio, or the ratio between the greatest and smallest capacity of the combustion chamber, is around 22:1, but for petrol engines, it is 8:1-9:1. As a result, the engine assembly requires a heavier/denser metal.

This has two extremely visible effects on the car’s performance, notably on torque and braking horsepower (BHP). Diesel engines produce more torque as a result of a higher compression ratio (longer stroke), which means you get more acceleration off the line. This is also why diesel automobiles have a lot smaller power band, so you get greater torque but it’s distributed over a smaller region. Turbocharging, which is used on all diesel engines these days to improve efficiency, exacerbates the problem. As a result, you’ll frequently have to wait for the turbocharger to ‘wake up’ before the car’s performance can be unleashed for a brief period of time. As the torque tapers off after the surge, it’s time to shift gears once more.