Need Air Filter Ideas

Scott & Heather · October 27, 2021, 09:18:51 AM

Hi Cliff,

Yeah it's I think 7". If 8" is what is specified then I'm not big enough. I guess I need to either make a 2000 cfm ecolite work or break down and get twin filters. If I pull air from the engine bay is that a bad thing? I can't get anymore air from the upper intake as those holes are already as large as they can be at this point.

buswarrior · October 27, 2021, 09:32:08 AM

Carve a hole in the side wherever it works to feed the other filter. Some of us carved into the sides of the MC8 above the air cleaner for similar reasons, air intake was totally crap even for stock installs...
I would avoid inhaling hot engine room air.

Performance temperatures of the various plumbing pipe materials online scatter gun:

https://www.engineeringtoolbox.com/plastic-pipes-operating-pressure-d_1621.html

Close proximity to heat would need a little protection, otherwise your engine room is a windy place, and the pipes are inhaling cooler outside air.

Happy coaching!
Buswarrior

chessie4905 · October 27, 2021, 05:14:06 PM

another hole probably will work. Do some thought how to avoid ingesting rain into filter.

Scott & Heather · October 28, 2021, 08:08:51 AM

I don't mind carving another hole, as much drama as that is, but the original hole/ducting on the drivers' side actually invades the bedroom (ducting runs inside bedroom between engine bay and radiator bay) so that is going to be drama for sure. I don't want to just cut a hole in the engine bay area because that will pick up rain mist (as you know these coaches throw a TON of spray on wet roads) in copious amounts...so I'm still working on this...

belfert · October 29, 2021, 06:55:23 AM

My bus has a Donaldson water separator mounted in the intake stream before the air filter. Unfortunately, the water separator is quite large. Mine is mounted vertically and the air intake is up by the roof.

luvrbus · October 29, 2021, 07:21:05 AM

To bad they tossed the pre cleaner and vortex on your bus here is a photo for one that LVMCI replaced that was rusted out and the 8 in to 5 in reducer from the air cleaner to the turbo.MCI missed the boat on cooling but they did do a great job on the air supply for the 8v92 all 8 inch piping.For some reason my photo of the backside showing the 8 in on the vortex will not post

windtrader · October 29, 2021, 11:04:06 AM

does anyone know what the airflow is at the top of the bus? If there is a clean flow of air across the top, it seems maybe a scoop up there down into the engine bay could provide much needed cool air.

chessie4905 · October 29, 2021, 11:21:59 AM

remember the old Flxibles with their air scoops? Could mount some decent areodynamic looking rectangular enclosure on rear of roof to satisfy air needs. Unless height clearance is a problem. Some city buses have something up there, maybe for hvac though.

luvrbus · October 29, 2021, 02:12:12 PM

Eagle tried the air scoops at the back on the roof in the 80's for a short period of time wasn't a good idea I guess because they stopped and went back to side intake,

DoubleEagle · October 29, 2021, 03:05:07 PM

The side intake must not have worked well, they only appeared for a couple years in the early 80's. I have one on my 82 Model 10.

kyle4501 · October 29, 2021, 04:54:14 PM

All this talk about air flow, but no mention of the pressure drop . . . a 6" pipe can flow 2000 cfm, but it will be at a higher pressure drop than a 8" pipe.

The parker filter I use is listed at 2000 cfm, but no delta P shown
The donaldson exchange is listed at 1500 cfm at 5"H2O.

Also, length and elbows add to the restriction (effectively making the pipe 'smaller' ).

If I was wanting to increase the flow rate & decrease the pressure drop, I would add another filter in a good spot - If 4" pipe is all you can fit in, that will still help.

luvrbus · October 29, 2021, 05:41:27 PM

Quote from: kyle4501 on October 29, 2021, 04:54:14 PM
All this talk about air flow, but no mention of the pressure drop . . . a 6" pipe can flow 2000 cfm, but it will be at a higher pressure drop than a 8" pipe.

The parker filter I use is listed at 2000 cfm, but no delta P shown
The donaldson exchange is listed at 1500 cfm at 5"H2O.

Also, length and elbows add to the restriction (effectively making the pipe 'smaller' ).

If I was wanting to increase the flow rate & decrease the pressure drop, I would add another filter in a good spot - If 4" pipe is all you can fit in, that will still help.

The last time Scott posted about this I took photos of the 134 Detroit engineering bulletin showing all the restriction factors on different sizes pipes,elbows and wyes it should be here somewhere