Table of Contents
Why carburetor is not used in diesel engine?
Diesel engines are also IC engines. However, in Diesel engines, there is no carburetor. Only air is compressed to much higher pressures and the fuel is injected into the compressed air. As the fuel and air are mixed, the fuel evaporates and ignites (hence called compression ignition).
Why do modern diesels have throttle lag?
New diesels now have many added emission control systems like the Exhaust Gas Recirculation (EGR) which further delays engine take off upon throttle application. These days, when you push your throttle pedal down, it is no longer connected to the fuel pump of old.
Why do diesel engines not make vacuum?
A diesel engine has no choked flow of air, therefore no manifold vacuum. The power is adjusted by the amount of fuel injected, not the position of a butterfly throttle.
How does a diesel run without a throttle body?
Usually, the diesels do not require a throttle body as the combustion pressure required to produce the required energy is regulated by the amount of fuel injected into the cylinders (Usually), thereby effectively negating the use of an air intake regulation mechanism.
How is throttle control on a diesel?
The throttle of a diesel, when present, regulates the air flow into the engine. Historically, the throttle pedal or lever acts via a direct mechanical linkage. The butterfly valve of the throttle is operated by means of an arm piece, loaded by a spring.
Is spark plug used in diesel engine?
Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. Technically petrol engines are called as spark ignition engines ( SI ) and diesel engines are called as compression ignition engines (CI ) .
Do diesel engines use oxygen sensors?
O2 sensors (or Lambda sensors) are generally not required in Diesel engine control. This is because Diesels operate with an excess amount of air with wide ranging lambda ratios. Also, air fuel ratio or lambda is controlled by metering the fuel quantity.
Do diesels pull a vacuum?
Most diesel engines now have a separate vacuum pump (“exhauster”) fitted to provide vacuum at all times, at all engine speeds. Many new BMW petrol engines do not use a throttle in normal running, but instead use “Valvetronic” variable-lift intake valves to control the amount of air entering the engine.
Do diesel engines need throttle body and throttle plate?
Short answer: Diesels do not need throttle body and throttle plate for its efficient operation. Why? Because Diesel engine is throttled by fuel not air like in a Petrol engine. Give more fuel in a Diesel engine and it turns faster with more torque, give less fuel it slows down.
What happens if you don’t have a throttle body?
With no throttle body to close the boost is consumed by the engine. This is the reason why some highly modified Diesels include a diverter valve/blow off valve in their build, to prevent stall/surge. Anyway I am not going that route.
Can a diesel engine run out of control?
Apparently a diesel engine can run out of control from oil pooling in the manifold. It seems that not having throttle plates on older diesel engines has it’s risks. Why have newer diesel engines begun to adopt a throttle?
Why do we need a throttle valve in an engine?
In carb type SI engines, as we all know, based upon the mean piston speed the air is sucked in and based on the speed of this air flow, certain amount of fuel is evaporated and will get into the chamber. It implies that we are controlling only the air flow which in turn controls fuel flow rate, Hence we need a throttle valve.