Science Forums 2

[alexander]

We just had to do some work to the header on my dad's tdi, well he snapped a glow plug when attempting to replace it, so we had to take the head off, so it could be machined out, and trust me, that butterfly throttle valve is connected directly to the throttle assembly (via a wire) and is most certainly there to control the throttle, like in every other engine.

Here's what makes NO sense, why would they leave the intake wide open all the time? It makes no sense mechanically, and i have worked on 1 or 2 motorized vehicles before (yeah, those numbers are closer to hundred if not thousand), its one of very few ways to control the mix, how are you going to control air, if you are wide opening the throttle? Now you may see the valve not being directly attached to throttle, it is an electronic valve, so unless you were running the engine, you wont see it move when someone presses on the accelerator. Unless its a jet engine of some sort, i dont see that you can control engine throttle without a throttle body that will limit air intake... any engine in a car, be it boxter, rotary, diesel, natural gas, 2 stroke, 4 stroke, 5 stroke, inline, v, w or otherwise (just not electric or fuel cell) must have a throttle body, that or my understanding of engine mechanics and chemistry and physics of propellants needs to be drastically changed, and memory of many hours spent at the shop working on them erased...