Should fan for generator radiator blow out or suck in?

6805eagleguy · March 15, 2021, 07:21:15 AM

Mine is the same, tier 4 whatchamacallit, it still smells pretty bad upon start up, when it was 20 degrees it made more smoke then the s60...

luvrbus · March 15, 2021, 07:29:49 AM

Quote from: belfert on March 15, 2021, 07:16:40 AM
In hindsight I should have just purchased the Cummins Quiet Diesel. I can't recall that there were any fit issues. I almost certainly would have gone with an enclosed generator if I could have found one not from Onan or Powertech. I've heard a lot about electronics failures with Cummins QD and that the boards are quite expensive which was a big reason not to choose Cummins QD.

The board hasn't been a problem with Onan in the past 15 years .the inverter model boards were a problem

My Kubota is tier 4 final, but I don't know how much the exhaust is really cleaned up. There is no SCR, EGR, or DPF so far as I know. Wrico did say the generator has been derated from 13KW to 12.5KW due to changes with the Kubota engine to meet tier 4 final.

There are quite a few internal changes to those little engine some are ok some are not lol they are not lasting 20,000 hours now I know that,Gary Hatt has a new model from Wrico it starts and burns clean

6805eagleguy · March 15, 2021, 07:31:00 AM

Quote from: DoubleEagle on March 14, 2021, 06:18:01 PM
Your entrance door sets you apart from all other Eagles, is that the slanted edge window that came from the left front? It looks like you might be missing part of the covers for the spare tire area. That is maybe why you are scooping a lot of air and eliminating low pressure areas in the front. You definitely have done a lot of work, and now you only have a few thousand things left to do.

Walter, that was a decent condition double pane window I got from another bus for free, so I decided to see how it would look...
well it looks

But I think it's fine. Everybody knows it's mine

It is quite possible the spare tire compartment pressurizes the under side of the bus.

RJ · March 15, 2021, 11:45:08 AM

Quote from: belfert on March 15, 2021, 04:44:12 AM
How does the hot discharge air from the radiator not just get pulled right into the air intake?

Brian -
You must have missed that the hot air discharge from the radiator squirrel cage blows out thru a louvered vent that's pointed towards the drive axle (actually the RR duals.) The genset and rad are on the driver's side. If you walk around the bus with the genset running, you can feel the warm air flow standing by the RR duals, but there's no air flow near the LR duals. So the louvered vent is doing what it's supposed to do - blowing the hot air away from the intake area.

Quote from: belfert on March 15, 2021, 04:44:12 AM
I see you used the egg crate foam. Doesn't that stuff tend to start to turn into dust with time?

This is the original installation/insulation done by Vantarè in 1992, so the egg crate foam is now 29 years old. Hasn't started turning to dust yet. That being said, I'm sure that there are better products on the market today.

FWIW & HTH. . .

chessie4905 · March 15, 2021, 12:06:55 PM

Brian, whetever you do, make sure serviceability reasonably easy.

belfert · March 15, 2021, 01:32:11 PM

Quote from: RJ on March 15, 2021, 11:45:08 AM
Brian -
You must have missed that the hot air discharge from the radiator squirrel cage blows out thru a louvered vent that's pointed towards the drive axle (actually the RR duals.) The genset and rad are on the driver's side. If you walk around the bus with the genset running, you can feel the warm air flow standing by the RR duals, but there's no air flow near the LR duals. So the louvered vent is doing what it's supposed to do - blowing the hot air away from the intake area.
This is the original installation/insulation done by Vantarè in 1992, so the egg crate foam is now 29 years old. Hasn't started turning to dust yet. That being said, I'm sure that there are better products on the market today.

FWIW & HTH. . .

Sorry, I missed the part about a louvered vent. I am still surprised it works, but it has been 29 years. This may very well be something I use.

There must be different grades of eggcrate foam. I have seen a lot of it that just crumbles at 29 years old when you touch it.

chessie4905 · March 15, 2021, 04:19:38 PM

some pics of mine:

belfert · March 16, 2021, 05:35:15 AM

Quote from: chessie4905 on March 15, 2021, 04:19:38 PM
some pics of mine:

Do you have issues with extra noise due to not having a remote radiator? A setup like yours would work better for me, but the larger air ducting would seemingly allow more noise.

Jcparmley · January 05, 2022, 09:44:29 AM

Quote from: chessie4905 on March 15, 2021, 04:19:38 PM
some pics of mine:

Your setup is similar to how my Powertech must have been set up in the past. I bought it used and the radiator is still in the same configuration as yours. I have a couple questions about your set up. First, do you like your Powertech and how loud is it in the quiet box? Also, what kind of fan do you have blowing into the quiet box?

chessie4905 · January 05, 2022, 11:06:47 AM

Pretty quiet, although a relative term. Works fine, has brushless gen head. Love the way it can be rolled out of the bay enough for service. Currently setting up a separate fuel tank for it.

Busted Knuckle · January 07, 2022, 08:23:09 PM

Another solution to the dust blowing while the generator is running would be t mount a mud flap horizontally under the discharge front to back. That will defuse the air to the side instead of straignt down.
We used to use this trick on charter buses for the air being discharged from the A/C condensers and it work like a charm!

BK

richard5933 · January 08, 2022, 03:12:32 AM

Quote from: Busted Knuckle on January 07, 2022, 08:23:09 PM
Another solution to the dust blowing while the generator is running would be t mount a mud flap horizontally under the discharge front to back. That will defuse the air to the side instead of straignt down.
We used to use this trick on charter buses for the air being discharged from the A/C condensers and it work like a charm!
BK

What was the horizontal mudflap mounted with? This might be handy under my OTR a/c fan to keep the dust down as we roll into a campsite.

My concern would be making it low enough to have adequate air flow from the fan, but then it seems it would be constantly getting in the way of ground clearance. Just hang it on chains? Cables?

buswarrior · January 08, 2022, 05:00:34 AM

Chain.

Leading edge tucked up a shade more, the rest hangs loose a couple inches.

Think of it as somewhat sacrificial, if it occassionally drags on something, well, it doesn't matter.

Conveyor belt material stands up well.

There are still places you need to shut it down, but they sure do make a difference to the cloud.

Happy coaching!
Buswarrior

sledhead · January 08, 2022, 05:52:01 AM

I made a wedge with sides under the genny fan discharge out of aluminum
tight at 1 end and 3 & 1/2 " down towards the outside edge.

works great as now all the hot air blows out the driver side with no dust storm

looking under the coach it is a lot higher than all the other things that hang down including the IFS front end

dave

Busted Knuckle · January 08, 2022, 10:39:31 AM

Quote from: richard5933 on January 08, 2022, 03:12:32 AM
What was the horizontal mudflap mounted with? This might be handy under my OTR a/c fan to keep the dust down as we roll into a campsite.

My concern would be making it low enough to have adequate air flow from the fan, but then it seems it would be constantly getting in the way of ground clearance. Just hang it on chains? Cables?

Richard yes as BW mentioned hang it by chain we used 1" angle iron with the mud flap bolted to it on each end of the mud flap. Then we bolted short chains onto the angle and bolted it to the bottom of the bus front to back allowing it to droop in the middle. It doesn't matter if it drags the ground occasionally, it's not going to hurt it.

BK