ISX 2350 485

[Magard]

I can understand the hose analogy. I also appreciate the turbo back pressure discussion. I always wondered how much back pressure it took to create boost. When I seen how restricted the inlet of the intake manifold was I couldn't believe that Cummings did that. I wonder if anyone has checked the pressure difference before the manifold compared to in the manifold. Combine that with a small charge system and it has to really make the engine work, just to breath. I was just thinking of once the air was in the manifold at a certain psi all it had to do was get into the cylinder through the head. But with all this back pressure difference it would throw off actual charge volume due to valve overlap. (I'm guessing there's valve overlap.) Hey thanks for the time. I just like to know what my machine has to do when I ask it to do it. Back pressure to drive turbo is something not thought of much unless your really on your game with custom tuning. Awesome.