Because the plenum connects the 4 runners......Evildriver-3 said:Think about it, your pulling from 1 runner not the plenum, how can it be equal pulling off 1 runner.
ED, have you ever heard of flow reversion It will cause all 4 cylinders on that plenum to flow equally (in so far as how they would be affected by a vacuum leak), no matter which intake valve is open. When the flow is going to #2 cylinder because it's intake valve is open, the flowrate thru the other 3 cylinders on that plenum will stop, same as when #8's intake valve is open, it's flowrate goes up, while the other three stops. There is NO FLOW thru the runner for a cylinder if the intake valve is not open. Sorry, it's just physically impossible for air to flow thru a shut valve. Just like there is no flow thru the straw you are sucking on if the end of it is blocked with ice, or the bottom of the cup.Evildriver-3 said:Problem is you are pulling after the plenum, so when you already start down that runner and add something to it it isn't balanced, the 4 runners are connected to the plenum on 1 side, but the vacuum port is on 1 runner after the carb after the plenum effecting only 1 runner to 1 cylinder not all 4 equally so in turn actually even doing it in the plenum you only effect those 4 cylinders a reason why you would use a plate beneath the carb and install the pcv or brake booster to that, why would you want to make an effect to only half of the motor or 1 cylinder.
Why the heck do you have your pcv valve connected to the vacuum tree It is supposed to be connected to the vacuum port on the bottom of the carb, so that it's fumes get dispersed evenly to all 8 cylinders. If you have the pcv connected to the vacuum tree on #8 cylinder, your causing your own different set of issues.You are sucking thru the pcv valve to 1 cylinder not 4, unless you know of a theory that when the # 8 cyl sucks thru the pcv valve it equals the other 3 cylinders.
I have no doubts about their exhaust, or mine...because they follow the laws of physics. Your trying to tell me yours doesn't. That's where the doubt comes in.Evildriver-3 said:You can have all the doubt in the world about you and your friends exhuast systems, but not mine, i have no exhaust leaks in any part of my exhaust.
I agree that the tube is positoned to allow a vacuum to be developed, and that if it is installed wrong, it will not work correctly. I DO NOT agree that the check valve is there for exhaust back fires.As the exhaust and it's pulses pass the evac tube which is installed to make a low pressure point and draw or suck out the psi in the motor, so if you don't have it installed correctly then you have a problem.
The check valves are only for back fires in the exhaust nothing else, they do absolutley nothing for helping the evac system.
Yes, I know this, and I understand it and how it works with the laws of physics. It is you who seems at this point to have your pcv in the wrong place, and who does not understand fluid dynamics and flow, or flow reversion, or the fact that if you draw a vacuum, or put pressure on any closed system, ALL portions of that system feel the vacuum or pressure (the runners and plenum are a closed system for all intents and purposes). Read the previous reply.So you are saying to me that sucking wasted crankcase oil fumes into 1 cylinder through 1 runner is good and is balanced on cylinders 3 - 5 - 2 and are all experiencing that loss, you do know that the dual plane is set up to work with the firing order and each side of the carb works that set of cylinders in that sequence.
Yes, it does...no way around it, unless you have a way to change the laws of physics. It won't draw the complete runner volume in, but it will draw some of it.So you think that when cyl 3, 5 or 2 draws in it sucks runner 8 into them
Well, on your engine, it will draw air off the cranckacse, which is basically a vacuum leak, and a dirty one at that. It should be drawing off the brake vacuum booster, which is sealed, hence no vacuum leak, and no change in intake charge dilution.and when cyl 8 draws the runner 8 vacuum port is adding to help that cyl fill evenly and as balanced as the other cylinders.
ED.....your example is actually a good one, but, at the rpm the engine runs, the flow you are talking about would never make it thru the straw, it would oscillate back and forth....hence the term flow reversion.Try this, get a straw put a hole in it's side add another straw and connect it to something with positive pressure and then suck in see what happens at the straight end that would be your plenum. Then lose that positive psi side of the straw and see how it works
Your plenum is where everything is equal, adding a positive psi crankcase with junk spewing from it past the plenum into the # 8 cyl runner where it would be negative psi for a moment and would draw all this crap in is not equal.
No ED, I fully understand what you are saying. The problem is, you either are refusing to understand/consider/think about what I am saying, or you aren't able to (I don't think it is the last part).Evildriver-3 said:TRCM i never said it flows thru all the runners, you said there all connected and are equal, does it matter if it's the pcv or whatever is connected to it, either way that runner is different and not equal to the rest that aren't having anything branched off it.
You are totally missing what im saying