what does a cam belt do and how does a injection system work.?

Answer 1

good questions to ask. I will try my best to answer clearly. The cam belt essentially ties the crank shaft to the cam or cam's to keep them in sync with each other. so when the pistons are moving in there order the valve's will open and close at the right time for the intake and exhaust strokes, to bring fuel in, let if compress and then let the exhaust out, just to start over again. as for injection systems, they are either a mechanical injection or electronic injection. i will only cover electronic here since 99% of the vehicles most people see are electronic. the system uses various different inputs and outputs from the motor and computer system to make the engine run. most systems are a batch fire system, meaning that they all inject fuel at the same time. then you have some systems that are sequential fire systems that inject at different times to stay in sync with the fuel intake on the piston/cam relation. to make it easy to understand when the piston is on the down stroke and the valve is open on the intake side the injector receives a signal from the computer to let fuel out and then injects atomized fuel/air mixture directly into the system. this happens over and over again as long as the car is running. injectors are like a spray bottle you squeeze the handle and it sprays as long as you keep squeezing the handle. to work properly and in top performance the system relies on vehicle temperature sensors, air intake sensors, O2 sensors, mass airflow sensors just to name a few. this is to help the system stay around the most effective 14:1 air fuel ratio. hope this helps a little bit

Answer 2

If the cam belt you are referring to is the camshaft timing belt then it connects the crankshaft and camshaft together with the crankshaft turning 2 times for every turn of the camshaft.

As far as how an injection system works would depend on what type of injection system you are referring to. A T.B.I. system, an M.P.F.I. system or a direct injection system. Would help to know what vehicle you are seeking information for.

Answer 3

A cam belt is there to time the pistons at their highest point to be ignited by the spark plug via the points, the injection system atomises the fuel to a far higher degree than a carburettor.

Answer 4

cam belt turns the cam shaft, the cams push the valves down and let them up again so fuel and air can go in, and exhaust (burnt fuel can get out.)
Injection system squirts right amount of fuel in at right time. Older engines, the fuel is dragged in with pressure of air coming in
HTH GL

Answer 5

If you need to ask for the answer to this, then best not do your own car maintenance. Even a 2CV would be difficult for you to understand by the sound of it.

Answer 6

http://en.wikipedia.org/wiki/Cam_belt

http://en.wikipedia.org/wiki/Injection_system