"The Timing belt" -read and learn-

[Kwanza]

Originally Posted by etxxz

i'm sure most people know what the Throttle body is, whwere it is and what it does. Connected to the throttle cable (gas pedal), it opens and lets more air in and it revs.

but it still doesnt answer the question about how it regulates the speed at which the T.belt moves (the cams, etc). I was refering to the part were, if the engine were to rev, the cams and the belt would have to turn faster right? but if the belt spins proportionally to the cams, in order to rev the T.belt would have to advance its pace to accelerate. I'm also thinking that the belt is stuck to this pulley and as the Throtle body lets more air thru, it causes a bigger explosion and then everything turning faster.

maybe i'm retarded and what i'm trying to say doesnt even make sense

*btw, that's one dirty TB!!

That would be where electronics and such come in. Once the engine is already spinning, there will be normal induction (idle). If there were no throttle control, no throttle body, no electronics, no restriction, etc, the engine will keep spinning faster and faster assuming the ignition keeps up. Because of electronics, vaccum, TPS, throttle body, etc, these things restrict the engine's revving and hold it in place. So when you apply throttle, things open up and allow the engine to spin faster. THe timing belt speed is directly related to the engine speed. The cams are then timed to the crank exactly and that doesn't really change, unless something else is changed (TPS, ignition timing, etc...). There are some systems such as VVT/VVTi that does allow the cam timing to alter slightly during operation, but for the most part, the cam timing is set to a specific number and that doesn't change. The speed of the cams is regulated by the crank and the size of the cam gears. The cam gears also have to be a specific size in order to keep the timing correct.