[a4anurag]

Originally Posted by binaiks

IIRC, it is present on both the sides. This is the old variant. The current ones are of a different design.

This is 9400 and seems be bought not more than a year old.

This one had only one side. The other side only housed the radiator on the whole area.

[binaiks]

Originally Posted by a4anurag

This is 9400 and seems be bought not more than a year old.

This one had only one side. The other side only housed the radiator on the whole area.

The bus doesn't seem really new to me. I am sure of the Air-intake assembly in the new Volvo buses. The regn number marked is AP-09-TA-2244, which according to the AP MVD website is a 2006 model bus. This is surely a pre-CRDI variant B7R - the one which produced 260hp. This model had lots of failures, which compelled Volvo to come-up with the current design of air-intake, where the intake is mounted on the rear pillars, above the engine level.

[Ashley2]

Originally Posted by a4anurag

Is that air intake sufficient for such an engine?!

This is the air intake pipe connecting to air filter. Air is sucked through this honey comb structure.

Originally Posted by binaiks

IIRC, it is present on both the sides. This is the old variant. The current ones are of a different design.

In this type its in one side only.

[a4anurag]

Good one Binaiks. But this is the old one buddy which has only one side air intake.

[A350XWB]

Originally Posted by Ashley2

This is the air intake pipe connecting to air filter. Air is sucked through this honey comb structure.

As Ashley2 mentioned, it's the air intake. If you notice closely, the inlet has a swirl mechanism attached to it and this helps to create a swirl for the incoming air and due to this, any solid particle present in the air, like sand, settles at the bottom of the chamber and can be removed periodically.
The same mechanism is used on WDG4/WDP4 class of locomotives used by Indian Railways, but the air-box in those can accommodate 2-3 people and has 2x1hp (IIRC) motors to suck in the air.

[binaiks]

Originally Posted by A350XWB

As Ashley2 mentioned, it's the air intake. If you notice closely, the inlet has a swirl mechanism attached to it and this helps to create a swirl for the incoming air and due to this, any solid particle present in the air, like sand, settles at the bottom of the chamber and can be removed periodically.

Don't these air filters have a particular name? I vaguely remember reading so somewhere - like a cyclone filter or something. The bus "sneezes" from time to time to remove all the accumulated dust. The frequency of sneeze increases as dust increases - like in rainy/dusty conditions.

[A350XWB]

Originally Posted by binaiks

Don't these air filters have a particular name? I vaguely remember reading so somewhere - like a cyclone filter or something. The bus "sneezes" from time to time to remove all the accumulated dust. The frequency of sneeze increases as dust increases - like in rainy/dusty conditions.

Yes, they are called cyclonic filter or cyclonic separator.
I don't know whether the sneezing is because of this. I thought that the sneezing is caused by the air dryer releasing the moisture and/or the release of excess pressure from the system. The sneezing can be heard from older buses and trucks also, which used only the conventional air inlets. Maybe they expel the dirt also in the newer ones, but I'm not sure.

[a4anurag]

Originally Posted by binaiks

Don't these air filters have a particular name? I vaguely remember reading so somewhere - like a cyclone filter or something. The bus "sneezes" from time to time to remove all the accumulated dust. The frequency of sneeze increases as dust increases - like in rainy/dusty conditions.

How effective are these air filters are compared to the ones present in the car and bikes?

If seen technically they are better and more efficient than the air filters present as they will remove the heavy debris and the finers ones can be removed by the paper types present in our cars.

Sneezing is from the air line which removes moistures and maintains the needed pressure in the whole line.

Originally Posted by A350XWB

Yes, they are called cyclonic filter or cyclonic separator. I don't know whether the sneezing is because of this. I thought that the sneezing is caused by the air dryer releasing the moisture and/or the release of excess pressure from the system. The sneezing can be heard from older buses and trucks also, which used only the conventional air inlets. Maybe they expel the dirt also in the newer ones, but I'm not sure.

+1 for the sneezing effect in trucks and buses. Does this sneexing effect happen in cars by any chance?

Anurag.

[A350XWB]

Originally Posted by a4anurag

Does this sneexing effect happen in cars by any chance?

I don't think the "sneezing" is present in cars as most of the cars does not use compressed air for brake circuits. They use hydraulic fluid and so, doesn't need to sneeze

[Ashley2]

Originally Posted by binaiks

... The bus "sneezes" from time to time to remove all the accumulated dust. The frequency of sneeze increases as dust increases - like in rainy/dusty conditions.

Dusting to be done manually in dust evacuating valve, periodically.

Originally Posted by a4anurag

How effective are these air filters are compared to the ones present in the car and bikes?
....+1 for the sneezing effect in trucks and buses. Does this sneexing effect happen in cars by any chance?...

These are far more effective and reliable (for that matter any aggregates) than the ones found in Cars. Secondary filter needs replacement once in ~48000 kms. This is in comparison upto 10000 kms for a car (also car does not have primary and secondary filter and its only one).

[a4anurag]

Originally Posted by Ashley2

These are far more effective and reliable (for that matter any aggregates) than the ones found in Cars. Secondary filter needs replacement once in ~48000 kms. This is in comparison upto 10000 kms for a car (also car does not have primary and secondary filter and its only one).

If they are superior and better why don't these come fit in cars?

Is it because of the cost involved or the space constraints the engine bay to place two filters?!

Anurag.

[Ashley2]

Originally Posted by a4anurag

If they are superior and better why don't these come fit in cars?
Is it because of the cost involved or the space constraints the engine bay to place two filters?!.

Not all the superior features need not be available in cars (Here I mean regular on cars and not SUV's meant for off roading)
This is for many reasons.
- Reduced availability
- Lower lifecycle costs
- Reduced durability etc etc..
I do have a different view of OEM's increasing their revenue by giving faster replacement parts instead of giving more durable parts.

[a4anurag]

I have noticed one thing in these Volvo 9400 multi-axle as when it brakes it makes a hissing sounds as to two metals rubbing each other or like air releasing during braking.

As much as I know the brakes are hydraulic equipped with retarders in each axle. What could that sound be?

[silversteed]

Originally Posted by a4anurag

I have noticed one thing in these Volvo 9400 multi-axle as when it brakes it makes a hissing sounds as to two metals rubbing each other or like air releasing during braking.

As much as I know the brakes are hydraulic equipped with retarders in each axle. What could that sound be?

Me thinks Volvo uses Air Brakes. That explains the hissing sound, I suppose

[a4anurag]

Originally Posted by silversteed

Me thinks Volvo uses Air Brakes. That explains the hissing sound, I suppose

Just checked their website.

It says suspension is Full Air,

But the brakes - Disc with EBS 5 with a retarder - Hydraulic one.

The other chance could be that the suspension is trying to maintain its compose under braking by releasing air to compensate for the dip. Correct me if i am wrong.

Anurag.