manifold approximation

[ahmadreza]

Hi.
I have considered some approximation for manifold after studing somewhat about it in "the Internal combustion engine", but I'm not sure.
we can assume a rpm for the engine then find the piston speed and by writing the Bernoly eqation we reach a very mistakefull manifold pressure.
The matter is that I coudn't find the pi in any sectin of the book furthermore it is said that torqe of engine can be controlled by regulating the manifold pressure.How is it possible?
I wanna know that if there is anybody who coude get the pressure-volume plot of the fuel-Air cycle of the engine they have chosen.

[ahmadreza]

Hi.
I have considered some approximation for manifold after studing somewhat about it in "the Internal combustion engine", but I'm not sure.
we can assume a rpm for the engine then find the piston speed and by writing the Bernoly eqation we reach a very mistakefull manifold pressure.
The matter is that I coudn't find the pi in any sectin of the book furthermore it is said that torqe of engine can be controlled by regulating the manifold pressure.How is it possible?
I wanna know that if there is anybody who coude get the pressure-volume plot of the fuel-Air cycle of the engine they have chosen.

[ahmadreza]

thanks for that everyone who read mine wrote his\her idea.
I saw that some teams have used bent tubes as intake ruuners.wath do you think will happen if they are straight?I think that one may be the
avoidance of separation of fuel_Air mixture.
thanks guys.

[absolutepressure]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">
I saw that some teams have used bent tubes as intake ruuners.wath do you think will happen if they are straight? </div></BLOCKQUOTE>

You'll get better air flow if they're straight. The less curves, the better. However, (I can only speak for myself because I don't know exactly why others do it), ours are bent so they fit in the invisible roll plane. The runners are too long with proper wave ram tuning equations to fit and still be straight.

As far as controlling torque through manifold pressure, I'd assume they mean adjusting the boost of a turbocharger. They could also mean wave ram tuning. I can't be sure without reading the whole section.

[KU_Racing]

absolute is right about the length of the runners- i am pretty sure if ours were straight they would be out of the roll plane. the main reason ours are bent is so that the injector points down the throat of the port and not at the wall of the runner.