Is $\tau$ the proper time of the object (which will be invariant for any FoR) or is $\tau$ the proper time of the observer ( $A$/ $B$ depending on who's observing), which is measuring the 4-velocity of the object?ĮDIT: Well, if $\tau$ is of the object, that means the 4-velocity of an object measured from observer A will be $dx^\mu/d\tau$ where $\tau$ is the proper time of the object.
What is $\tau$ in $eq $$\mathbf 1$ and $eq $$\mathbf 2$?. $eq$$\mathbf 1$Īnd how will $B$ describe $\mathbf u^\mu$ of $C$?. Then how will $A$ describe $\mathbf u^\mu$ of $C$ ? Let's suppose, an object $C$ is at rest with respect to $A$. My doubt is, suppose we have two observers $A$ and $B$, $A$ at rest and $B$ moving with velocity $\mathbf v$ relative to $A$. This is an interesting thread, now even I am curious to know more about this Please shed some light on this and enlighten us.Now, 4-velocity is defined as $\mathbf u^\mu$ = $dx^\mu/d\tau$, $\tau$ being the proper time.Īnd then the four momenta is $\mathbf P^\mu$= $m_0$$\mathbf u^\mu$. I didn't take his explanation, but once I put it back the bike went back to normal. I had once removed it and the bike had cold start issues and when I took it to my mech, he said that the bike is running lean so put it back. It is a sort of S shaped double barreled tube under the seat which opens in the airbox. Yep that plastic/rubber thingy is also inside the Karizma airbox. I thought about it but when one thinks boxer engines nowadays, the only things that come to mind are the guys from Stuttgart- the Porsche flat-6 motors. I just wanted to know if this is retrofitted on to an engine which doesn't have one would it be of any benefit. When i opened an Avenger's airbox i found a plastic velocity stack thingy sitting inside it. This Turbo Shield is designed to minimize airflow impediment and only keep large debris from entering the turbo or engine. Imho the first pic is also has individual throttle bodies (on a flat 4 motor) but the stacks are placed inside the airbox which is to be sealed and fed by a turbo. One Piece Billet Design Bell Velocity Stack Design Inner Channel and Set Screw Locking Design Designed For 4 Turbo Inlets. So my question is does this device actually help in increasing performance? I have seen this either fitted inside the air box or it is fitted without airbox. Most of the old racing motorcycles also had these fitted on to the carb mouths. The old GP spec engines used to have these intake trumpets fitted to their carb or throttle bodies. A velocity stack gives the engine a chance to re-inhale that fuel which can be helpful. "Stand off" is fuel which is spit back out of the intake by pulsing action in the intake system. Most fuel systems already incorporate some kind of tapered entrance, nullifying what gains might be had from a velocity stack.īeyond air flow improvement a velocity stack may be useful in containing "stand off" which may result from removing the original ducting. Modified engines often have the original air box and associated ducting removed and velocity stacks are installed as aerodynamic replacements.Īlthough “racy” in appearance, velocity stacks do not usually have a major impact on airflow or performance.
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