what is single point injection in cars?

Answer 1

I think you are referring to the TBI, throttle body injection used on the cars of the mid 80's :)

Answer 2

Single-point injection (vs multi-point) is when the fuel is injected from a single nozzle, located in the center of the intake manifold. This technique, as a previous answer pointed out, was used in the mid-80s (TBI - throttle body injection) as an easy way to get some of the advantages of fuel injection by just replacing the carburetor with a TBI unit, but otherwise not modifying the system.

Nowdays, most systems are multi-point, which has a separate nozzle for each cylinder. This system is inherently more complicated that single-point injection, and was more expensive back in the 80's, but economies of scale have made it possible to put in most every car today. It has advantages in driveability and emissions control that single-point can't match.

Answer 3

It's a simple, early answer to multipoint fuel injection where the single injector is housed in what looks like a conventional carburettor.

Answer 4

It is a fuel injection system that sprays air and gasoline into a manifold, an chambers in the manifold lead to each cylinder.
The more common system is to have individual fuel lines running to injector nozzles in each cylinder head.

Answer 5

Where the petrol comes out of one jet as opposed to a multi point injection where it comes out of a few.

Answer 6

its a point injection that has the common sense not to get tied down to one woman yet. hahaha