Im no expert but from what i can come up with in my head is just because the valve closes doesnt mean the air that was introduced in the chamber stops moving (swirling). If it still has alot of movement when the diesel is injected when valves are closed, i would asume youl get a greater mix. Even though our motors "only" spin slowly just imagine at even 1000rpm how quick things happen, no chance for swirl to stop if indeed it is created.JoeBleed said:Ok. i am not very briliant when it comes to thinking about fuel mixture. I under stand swurl in a gas vehical that mixs fule in the air before the cylender and why they do it.
But i don't understand it's purpouse in a direct injected engien. gas or diesel. (mostly diesel) The air is injected and then compresed, then fuel is injected. With the valves closed and the piston compressing, i just don't see how intake port configuration would matter one bit for the combustion proccess in a direct injected vehical. The only thing i can think of that would matter in the combustion stage on these vehicels would be injector presure, injector spray patteren and piston top design.
What does everyone else think?
Correct for your lawnmower, however . . . no fuel in the intake, it's gets injected downstream into the cylinder . . . only air flows thru the small ports. . . think direct injection, not normally aspirated gasRub87 said:I think that fuel atomisation in the closed-of runner will not do very well..
jsrmonster said:Correct for your lawnmower, however . . . no fuel in the intake, it's gets injected downstream into the cylinder . . . only air flows thru the small ports. . . think direct injection, not normally aspirated gas
engineers restrict the air intake during low load to increase flow velocity. I suspect it helps reduce clogging if stuff is moving by faster, but restricting intake is not emissions beneficial, imho. It makes the boost gages dance around funny when intake velocity/volume is constantly changing. I just unplug the dashpot so it defaults to open position all the time. It compliments egr0 for offroad apps. ;-)
ASV has anti shudder valve by default.. it's vacuum controlled.. It only serves to freeze the engine faster after you put it off, or when you get a runaway caused by too much oil in the intake system (turbo failure)If it is just a shutter valve, I'd like to try to build on my ASV
I know that. I was asking for the function of the butterfly valve in the picture.Rub87 said:ASV has anti shudder valve by default.. it's vacuum controlled.. It only serves to freeze the engine faster after you put it off, or when you get a runaway caused by too much oil in the intake system (turbo failure)
The throttle plate (pictured above) serves three purposes:Lucas said:I know that. I was asking for the function of the butterfly valve in the picture.
This system also has a valve in the 'block' where the EGR-cooler attaches to. I'd like to know what the exact functions are for both valves. Do they both act as a anti-shudder valve for instance...?
Here, see this:Lucas said:@Rub87: I think you don't understand . I'm talking about the engine in the pic (or in general AXR or BEW engines), not the ASV.
Does anyone know how this anti-shudder valve (No 9) can be operated? I'd like to build one on my VP engine. It has 4 connections. Two of them are plus and ground (1 & 2), the other two are signal wires (3 & 4). I guess it is some kind of bipolar stepper motor. I tried putting 12V on pins 3 and 4 but that doesn't work. All info is welcome!