Air Filter

[Lifes2short4nofun]

I read some old post from searching about air filters but I wanted to double check since they were older post.

I have a 1972 MCI 5B with a 6v92 and it has a paper filter.  I was thinking about switching out to a K&N but after all the post I read I am thinking a paper Baldwin filter.   Am I thinking right?

[Oonrahnjay]

I read some old post from searching about air filters but I wanted to double check since they were older post.

I have a 1972 MCI 5B with a 6v92 and it has a paper filter.  I was thinking about switching out to a K&N but after all the post I read I am thinking a paper Baldwin filter.   Am I thinking right? 

        Paper.  You do NOT want to take *any* chance of "dusting" a DD 2-stroke.   A bad air filter will literally kill your entire engine.  Don't do anything but the best air filter you can find.

[chessie4905]

K&N may be great for a car or truck, but I wouldn't trust one in a HD commercial type application like in our coaches. There have been incidents of their breakdown in cars to make them suspect. Plus airflow through our engines is at a much higher rate most of the time than a car relative to engine size. Baldwin and comparable commercial brand filters have been proven over hundreds of millions of miles. Also, our air filters should be inspected on a regular basis, especially on trips where constant rain is encountered, especially on the older models that we're originally designed to use oil bath units. We've had reports of engine damage from failed air filters distorting and collasping in the past from what appears to be severe moisture and lack of regular maintenance.

[buswarrior]

No fan of K&N filters...on anything.

Performance increase by reducing filtering?

If increased airflow is desired, change to a proper larger capacity filter and housing.

Baldwin is one suitable filter supplier, both air and oil.

happy coaching!
buswarrior

[Iceni John]

I use a Racor 094973002 ECO-BC for my 6V92:  https://www.parker.com/literature/Racor/Racor_Engine%20_Air_Filtration_-_ECO-BC_-_7595.pdf   It's the largest one made, capable of flowing up to 1750 CFM (big enough for a 8V92), all one piece, with 7" inlet and outlet.   So far, so good.

Definitely stay away, well away, from those K&N things!

John     

[eagle19952]

I use a Racor 094973002 ECO-BC for my 6V92:  https://www.parker.com/literature/Racor/Racor_Engine%20_Air_Filtration_-_ECO-BC_-_7595.pdf   It's the largest one made, capable of flowing up to 1750 CFM (big enough for a 8V92), all one piece, with 7" inlet and outlet.   So far, so good.

Definitely stay away, well away, from those K&N things!

John     

keep searching, there was a catastrophic/expensive Baldwin filter failure well documented here a few years back. Wix or Donaldson are as low as i would go on the filter totem...

i had a Baldwin oil filter split a seam once. no more red filters for me.

[luvrbus]

Baldwin is a old filter manufacture I have used them years with no problem,since last Feb Baldwin belongs to Parker if there was a problem Parker will have it solved.
Filter have a shelf life check the dates and don't buy filters over 3 to 5 years old the E bay sellers will sell you 10 year old filters at super buy but you are asking for trouble with those that has been my experience in the past with bargain filters     

[Lifes2short4nofun]

Filter have a shelf life check the dates and don't buy filters over 3 to 5 years old the E bay sellers will sell you 10 year old filters at super buy but you are asking for trouble with those that has been my experience in the past with bargain filters     

Thanks for that great information.

[kyle4501]

Air flow rate means absolutely nothing if you don't know the pressure drop at that flow rate. What is really needed is a graph that shows flow vs pressure drop.

1500 cfm at 5 inH2O  may be more air than 2000 cfm at 8 inH2O  ---  especially if your engine only pulls 5 inH2O . . . .

[Iceni John]

Air flow rate means absolutely nothing if you don't know the pressure drop at that flow rate. What is really needed is a graph that shows flow vs pressure drop.

1500 cfm at 5 inH2O  may be more air than 2000 cfm at 8 inH2O  ---  especially if your engine only pulls 5 inH2O . . . .

Didn't someone here (Luvrbus maybe?) say that a 6V92 needs 1225 CFM of air at full wellie, so a filter rated at up to 1750 CFM theoretically should work well with minimal restriction.   Yes, I wish manufacturers weren't so parsimonious with their information, but Racor doesn't state pressure drop and I don't know what Detroit says, so we can really only guess what will work well.   After I installed my new Racor I noticed not only more power, and the turbo sounded louder and seemed to spool up quicker, but I also had less smoke on takeoff.   To me it seemed like the engine was now getting more air more easily than before.

John     

[kyle4501]

Forgot to mention what particulate size can pass thru the filter is also important -

K&N filters will pass much larger particles when fresh cleaned (the flow rating they publish), but, as they load up with dirt, they do a better job of cleaning the air ( but at a lower flow rate. )

[luvrbus]

Detroit has the charts you also add CFM for any bends in intake piping it is all in a engineering service bulletin from Detroit  damn now I forgot the number   

[robertglines1]

Racor/parker/eco-boost/ Have all been mentioned.  I have a 60 serries(2000 yr) What and where to get filter with housing.  I have one off one of the semi now but can not verify age and don't see seria; # on it. Suggestions??? This is a weak point for me as I'm started from scratch. No air filter set up at all. I started with a burned shell with no engine or trans..Bob

[Iceni John]

Racor/parker/eco-boost/ Have all been mentioned.  I have a 60 serries(2000 yr) What and where to get filter with housing.  I have one off one of the semi now but can not verify age and don't see seria; # on it. Suggestions??? This is a weak point for me as I'm started from scratch. No air filter set up at all. I started with a burned shell with no engine or trans..Bob

That's where a one-piece filter assembly like the ECO-BC may be easier.   Racor also makes the mounting clamps for it, so it would be easy to custom-make the entire intake system.   Notwithstanding what's been said about pressure drop, the big one like I use should work well for a Series 60  -  a 4-stroke is sucking in half the air volume of a 2-stroke of the same capacity.   The downside of ECO-BCs is that they're more expensive than just a filter element itself, so if you're driving a lot that could be a factor:  you're paying for convenience.

John

[chessie4905]

When you own a Prevost, money's no object.:-)