Does a diesel engine have a throttle?

Answer 1

Diesel engines do not have throttles. Why? Diesel engines run on a compression ignition system, not a spark ignition like its gasoline cousin. When using a compression ignition system the volume of air intake will always remain constant. To control idle speed and under load conditions a high pressure injector is used to inject high pressure fuel to overcome the pressures in the cylinder when TDC (top dead center) on the compression stroke is reached. All of these pressures fighting one another amount to a great deal of heat. There is more thermal (heat) energy in diesel than gasoline and is about one third (1/3) more efficient than gasoline. Also diesel fuel in not volatile, unless heated, so it is safe to store at room temperature unlike gasoline. This lack of volatility in diesel is also a reason that compression ignition is needed to use this fuel.

Answer 2

Not in the strictest sense. In a gasoline engine, the air/fuel ratio is constant and flows past a butterfly (throttle) valve. Gas fuel injection still uses the throttle butterfly but meters the fuel in at the cylinder intake. Same thing. Power is regulated by thinning out the air/fuel mix (creating manifold vacuum) by closing down the throttle butterfly.

With diesel, you don't need to control the air volume coming in. Power is regulated by the amount of fuel that's injected into the cylinders. It's more efficient for two reasons. First, the higher compression ratio makes it more efficient. Second, there's much less throttling loss. It takes power to suck the gasoline/air mix past the partly closed throttle plate in a gas engine.

Answer 3

basically all engines have a throttle - how that throttle is controlled is different - can be manual/mechanical or electronic/computer controlled.

A diesel engine by it's very nature is always injected and therefore has a throttle-body as opposed to a carburator like in a lot of gasoline engines (although not in newer cars).

HTH!!!

Answer 4

yes an no. diesel's do it different than gas,
Gas motors control BOTH gas an air in to the motor. Gas motors have to be in sync, by way of jets in the carburater and air by way of butterflies.

Diessel's regulate only the fuel. The intake is wide open no control, the throttle on a diesel is only controling the fuel to the injector's

Answer 5

Yes now days they are computer controlled, years ago they had a rod that ran from accelerator pedal to either the fuel pump or the govenor housing depending on what make of engine it was.

Answer 6

yes sir they do.. but they dont have the spark plugs..