I'll try an attempt on the physics of the cylinder fill. Say in the abstract, electricity is as fast as air. Say if lightening travels to earth as fast as lightening, well, it needs to travel at that speed in the air is the air can both keep up and is the fastest path is the electricity. Do we have that basic concept you can sorta see in the air?
So we are watching/listening to an F1 engine scream at 18,000rpm down the streets of Monaco. How fast do you think that air can travel? You know how much pressure is in that chamber when the intake closes? How about 14.7PSI is all there is on the close.
Slow down the speed of the engine and stop the crank positions. The piston is at TDC (top dead center). What is the cylinder fill at this point is the crank is at TDC remember. You better act like the speed of electricity to be on the same page as me is my physics ride in the absolute. I cannot change a thing no matter how many people you read and their theory to the way a 4-Stroke Otto-cycles.
You call the ball on your physics is how I work my 4-Stroke engine is call the ball on mine is thank you very much. I am going to ask you now how many pounds per square inch is the crank at TDC is as dead as a door nail? If you said, 14.7psi, I am going to say I agree with you.
I am going to physically spin the crank as fast as I can and like think like this is that piston is going to suck the full volume of air to that cylinder as fast as 18,000rpm and say we hold that crank at BDC. Do we agree at some point it stops at BDC? Is all that volume she wrote is at the bottom?
What is the pound per square inch of that cylinder being filled is now at BDC? If you said 14.7psi, I am going to agree with someone out there and say, "Absolute BDC Yes it is 14.7as if I could pee in my eye PS Eye slipped up, sorry. Back to serious....
Stand on the piston and look up at the big intake valve cause we are going to close the deal on the cylinder fill. Now you are heading fast as gas is light me up not yet. Have we closed the valve? No. Are we still climbing and now are we moving all that we sucked on the volume fill at BDC is we are on the way up to empty it out?
Wait.. If say that valve opened and there was either a vacuum or a pressure going on, isn't that intake valve still open? OK, so if we are on the electric stroke on the choke me for saying this to quantify over and over is did we not agree about BDC and TDC being both at 14.7 with the intake valve still open? So if the piston is heading up and is going to pump out what it sucked in? Could we agree that if at bdc and tdc that the valve is open no matter what is that cylinder is still at 14.7 on the move is no pressure changed is the valve is still open and now there is a push of air heading out the cylinder? or did the valve close on a constant vac/press remains constant till closing. Could you start the first stroke to the 4 strokes is the intake?
We did not compress anything is the intake is still open and that is a neutral balanced fill is stable at the speed of air if it travels at 18K and stops dead on those strokes too, are not all the fills no matter the speed, 14.7? That sorta makes sense to me if not to you is I might be on the physics side and you might have your own theory how you come up with fuel ratios as a baseline.
So, are we back to agreeing about the physics that the valve did not change at closed or open (is still open) is we still are at 14.7psi (open valve) is now you better think this one out or you become the racing back marker, adjusting those push rods and taking advantage of moving air speed faster on either valve opening is the fundamental basic bottom line is this is it in a nutshell is we are almost done.
Now, take a breath and stop. Did you take a suck in? Did you stop (closed the valve is stopped) breathing and is that now 14.7 is you are not pushing air out, nor breathing air in; so did that valve close on 14.7 is you better sleep on it.
hnoes
:bash
<< I do not make the physics up. I just follow it and work off the valve setting now is play with the timing once the cams are dialed in on the lobe split settings is base valve open/close. Now open the intake sooner so the 14.7 speeds in quicker is all you are doing to that one 14.7 ambient side.
Yeah, and you want those big rockers like they suggested is they open quicker is the bigger size is the old Smokey Yunick trick with the 409 rockers on the 350 heads.
So, say we are up in elevation and there is less air and we need less fuel for less air. When the valve closed up in elevation... What was the final pounds in fill was that mountain is either down at sea level is name that number :confused
Yeah, and I sure am a Poser at whatever vette site is the same as speedtalk site my ride... HA! :cool
Rob?
From, The Enveloper who is 17 websites Trophies strong. I'll speak the way I want is thank you very much is password anytime.
