What is "bottle" beneath intake duct on passenger side?

Mandingo · 12-22-2012, 01:05 PM

The intake tumor is there to silence intake noise and to (theoretically) increase efficiency.

Quote:

How the Resonator can improve Volumetric Efficiency

-In an IC engine, air or the air-fuel mixture is sucked inside the cylinder while the piston is moving toward bottom dead centre (BDC).

-As the filling process progresses, the charge air gains more and more momentum, so the speed of the charge air increases gradually.

-As soon as the piston reaches BDC, suddenly the inlet valve closes. But, the air in the intake manifold still has a substantial amount of velocity (or dynamic pressure).

-Eventually, the flowing charge air hits the closed valve, and the pressure of the charge air at the vicinity of the valve increases. The pressure wave bounces back and starts moving toward the opposite direction.

-If a resonator is attached with the inlet manifold, then it will act like a spring to the just-created pressure wave.

-The frequency of the resonator determines the speed at which the pressure wave will proceed again toward the inlet valve.

-If the frequency of the resonator and the speed of the engine (which determines the interval between the opening and closing of the inlet valve) are properly tuned, the pressure wave will hit the inlet valve again at the time when the inlet valve is open. This phenomenon will cause a rush of charge air into the cylinder. The charge air will be forced into the cylinder, causing the increase in volumetric efficiency.

-The point to be noted here is that you will get maximum benefits of increased volumetric efficiency only if the engine running frequency and the resonator frequency are properly tuned. That means you can get maximum benefit only for a particular engine operating speed with a fixed frequency resonator.

-For selecting a resonator, the engine operating speed, intake manifold design, and volume of the intake manifold need to be considered. Roughly, the resonator frequency is kept around double the engine frequency in order to get the benefit of the volumetric efficiency increment.

Rusty · 12-22-2012, 01:12 PM

Quote:

Originally Posted by SouthArk370Z

That's it. At 10 o'clock position form the label "16577FA". Thanks.

Not looking to get rid of it, just curious what it is.

Quote:

Originally Posted by Rusty

Baffle/oil separator.

Quote:

Originally Posted by Mandingo

The intake tumor is there to silence intake noise and to (theoretically) increase efficiency.

I'm looking at the one at the 10 o:clock position. Think you are looking at the one at the 5 o:clock position. And that would be what you are describing.

SouthArk370Z · 12-22-2012, 01:36 PM

Thanks, folks. Lots of good info. Thank, Mandingo, for the theory.

Too bad there is not one on the right side duct. Since the resonator is not really necessary, the hole in the duct would make a great port for inserting a thermocouple. Might end up using the left side for the t/c, but, since the ECM only looks at the bank 1 sensor, I would prefer to use that side.

12-22-2012, 01:36 PM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324199	Thanks, folks. Lots of good info. Thank, Mandingo, for the theory. Too bad there is not one on the right side duct. Since the resonator is not really necessary, the hole in the duct would make a great port for inserting a thermocouple. Might end up using the left side for the t/c, but, since the ECM only looks at the bank 1 sensor, I would prefer to use that side. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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