Pusha,
Why don't you please visit another thread. Thank you. |
Originally Posted by miata2fast
(Post 710780)
Pusha,
Why don't you please visit another thread. Thank you. |
Originally Posted by nitrodann
(Post 710740)
4 stroke 4 bangers, like sav said, only have one cylinder on an intake stroke at any one time, and at the top and bottom of that one stroke per 2 revolutions its hardly moving, and the piston is only 78mm, and its sucking through 2 30mm ports with valves only opened 7mm so why the hell would a completely open 60mm hole restrict this In individual throttles, you do not have that problem. The charge is constantly traveling in one direction. Or at the very least, does not have to refill the vacuum created when the other cylinders are pulling from the same source of air. |
hang on, same airflow over a larger intake area is -increased- velocity? I must be retarded to have missed that.
Sorry. Dann edit: clarifying sarcasm |
If theres no vacuum guage reading difference at WOT between the sides of the butterfly how is there now a vacuum in the runner? If that were tru WOT would be like 80kpa, not 100.
Dann |
Originally Posted by nitrodann
(Post 710798)
If theres no vacuum guage reading difference at WOT between the sides of the butterfly how is there now a vacuum in the runner? If that were tru WOT would be like 80kpa, not 100.
Dann |
Originally Posted by nitrodann
(Post 710795)
hang on, same airflow over a larger intake area is -increased- velocity? I must be retarded to have missed that.
Sorry. Dann edit: clarifying sarcasm |
Originally Posted by nitrodann
(Post 710795)
hang on, same airflow over a larger intake area is -increased- velocity? I must be retarded to have missed that.
Sorry. Dann edit: clarifying sarcasm |
Originally Posted by Braineack
(Post 710800)
All four valves don't open at the same time...air flows in waves. When the valve closes air inside that runner will flow back out into the plenum.
And different chokes are great for changing velocity, but down choking itb's to result the same velocity as the stock TB would defeat the purpose completely of the advantage that you have argued it posesses. (ie inceased flow AND velocity...apparently). Dann |
Originally Posted by miata2fast
(Post 710775)
The intake speed is higher on individual throttles (if they are tuned correctly) than any cast log manifold any day. Higher speed results in having more air/fuel in the combustion chamber. And THAT results in more power.
Did I make that simple enough for you to understand? Heres the quote, intake speed is higher (on your larger total cross section ITBs) apparently. Only way this is actually possible is a smaller total flow area. The reason that ITBs whether carbies or Quads are choked is that stomping them from low throttle opening fast results in a big flat spot due to not enough intake velocity. This is partially caused by fuel falling out of suspension but thats starting to get to e a long story. Dann |
Originally Posted by miata2fast
(Post 710790)
Here is something else you are not factoring. In a log manifold all runners are connected. So as one piston is pulling air into the combustion chamber, it is creating vacuum in the other runners. This causes the charge to go in reverse in the other runners.
|
Originally Posted by nitrodann
(Post 710805)
And different chokes are great for changing velocity, but down choking itb's to result the same velocity as the stock TB would defeat the purpose completely of the advantage that you have argued it posesses. (ie inceased flow AND velocity...apparently).
Dann Displacement and rpm are generally what determines what choke size you need. There is a general graph available that determines the size, but good tuning is what is required to find out what is the best choke size needed to gain the most power. When I tuned my car, I continued to go faster untill I used the choke size that I have currently. I tried 3 different size chokes. Unfortunately, I can not go any larger on choke unless I step up to the next sized throttle housings. However, with the rpm and discplacement I am currently running, I do not think I would go faster with larger chokes at this point. My point is with a log manifold, I would be stuck with what ever runner diameter the manufacturer built, and I would be stuck with what ever results I was given. |
Originally Posted by nitrodann
(Post 710806)
Heres the quote, intake speed is higher (on your larger total cross section ITBs) apparently. Only way this is actually possible is a smaller total flow area.
Dann |
Originally Posted by nitrodann
(Post 710805)
I see your point here ...
Modern intake manifolds usually employ runners, individual tubes extending to each intake port on the cylinder head which emanate from a central volume or "plenum" beneath the carburetor. The purpose of the runner is to take advantage of the Helmholtz resonance property of air. Air flows at considerable speed through the open valve. When the valve closes, the air that has not yet entered the valve still has a lot of momentum and compresses against the valve, creating a pocket of high pressure. This high-pressure air begins to equalize with lower-pressure air in the manifold. Due to the air's inertia, the equalization will tend to oscillate: At first the air in the runner will be at a lower pressure than the manifold. The air in the manifold then tries to equalize back into the runner, and the oscillation repeats. This process occurs at the speed of sound, and in most manifold travels up and down the runner many times before the valve opens again. |
And mazda got it horribly wrong?
Dann |
Thanks Brain. Explained properly.
|
Originally Posted by nitrodann
(Post 710825)
And mazda got it horribly wrong?
Dann |
Lol, this will never go anywhere really. I have cams portwork solid lifters etc etc etc but i still have stock Im if that answers your question.
Dann |
Originally Posted by Savington
(Post 710810)
Google the word "plenum".
I guess it would if you had a ram air affect, but that is not exactly easy to create. And certainly not cheap. |
Originally Posted by pusha
(Post 710782)
I would like to be cornholed by a gianormous ban hammer, i don't see what me leaving is going to change.
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