KLACKO wrote:Ideally, I'd like to see this concept hashed out on this forum as well; I think this style of forum might facilitate the discussion.
Cheers...
The benefits of Fuel Injection compare with non Fuel Injection engine
An engine which has a carburetor has to work against the restriction
of the carburetor venturi. This is called "pumping loss", where the
engine uses about 15% of its own power just pumping fresh air through
the carburetor...
A fuel injected engine can either produce 15% more horsepower because
it has far less intake restriction, or it can realize 15% more fuel
economy because it does less work on the air it sucks in...
Fuel injection is a system where the gasoline (or diesel fuel) is
squirted into the intake port or into the cylinder of the engine by
means of a mechanical pump...
If the fuel is squirted into the intake port, the pressure doesn't
need to be as high as if it was squirted directly into the cylinder
after the intake and exhaust valves are closed.
Direct cylinder injection after the valves are closed results
in less air pollution, but the mechanical high pressure pump is more
expensive...
Car fuel injection systems have been around since the 1950's, when Mercedes
Benz began installing them on their sports cars, like the 300SL's...
Those were port-type injection systems, not electronic fuel injection, like
modern cars have. A carburetor-equipped engine doesn't know when to stop
sucking gasoline into the intake tract, it will suck gasoline even when the car
is coasting downhill with closed throttle and doesn't need any gasoline...
Electronic fuel injection solves that problem by controlling the flow of fuel
into the intake ports with solenoid valves on each fuel injector. And,
EFI-equipped engines don't need an expensive, high pressure mechanical injector
pump either, they can use a small low-pressure electric pump instead..
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