The lack of a throttle body in diesel engines is traditionally a key distinction between gasoline and diesel engines, though this is no longer true for all current diesels. In a diesel, pressing the accelerator pedal just instructs the fuel injectors to inject more diesel. More fuel injected implies more power, which means more exhaust, more air from the turbo, and the power output keeps rising.
Some diesel engines include throttle controls that allow for more precise adjustment of the intake manifold pressure, which aids in increasing the quantity of exhaust gas recirculation. Adding a throttle valve to the engine also aids in shutting it down by allowing you to taper the quantity of air allowed in for a smoother drop in RPM.
A throttle body, on the other hand, is required for gasoline engines. You’re merely opening up the throttle and allowing more air to flow into the engine when you press the (inappropriately titled) gas pedal. More air means more fuel is delivered by the injectors, and more fuel means more power.
Does a Duramax diesel have a throttle body?
On a diesel, there is no throttle body; instead, the EGR system has a butterfly valve. It has a stepper motor and a position sensor on it, and it closes when the EGR opens.
Does turbo engines have throttle body?
Today’s vehicles all have the option of a turbocharger. You might be shocked to learn that, in addition to smaller economic cars, light-duty trucks, both gas and diesel, have turbocharger options. Turbos work well in smaller cars since they provide more power at lower RPMs. Drivers prefer this because it gives them the feeling of driving a larger, more comfortable vehicle with a more powerful engine without needing to downshift to provide power for climbing hills or passing other cars. If your car doesn’t have a turbo option and you want one, consider buying a kit to convert your normally aspirated engine to a turbo. Exhaust manifolds, intake manifold adapters, larger fuel injectors and throttle bodies, and other parts are available as kits.
What controls the speed of a diesel engine?
Many characteristics of off-highway diesel engine operating are similar to those found in automobiles. However, there is a significant variation in how an off-highway diesel engine’s performance is managed. To accomplish vehicle speed, the driver of an automobile regulates the engine’s power. An off-highway diesel engine’s operator only has to manage the engine’s speed; power is created automatically. This behavior is comparable to that of a car’s cruise control.
Lean burn engines are diesel engines that require more air than fuel to operate. They inhale an unlimited amount of air and inject the exact amount of fuel required to generate the desired power.
In petrol engines, on the other hand, the air and fuel mixture must be precisely balanced in order to produce power. When you press down on the accelerator or throttle pedal, a valve that controls airflow into the engine opens or closes, and the fuel system responds by supplying the correct amount of fuel. No power demand when the foot is off the pedal; maximum power demand when the foot is on the floor.