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Old 02-06-2007, 10:44 AM   #1
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Generator mounting

Looking at mounting the generator under the bus in a cage type frame. Current plans are to weld/bolt uprights forward, inboard, and aft of the generator and use bolts on the lower supporting frame work to facilitate easier removal for possible repair. The way I have it figured all frame work should be 1" square x 1/8" wall tubing. Along with 2" of insulating foam board and 1/2" or 3/4" plywood backing it along the 1" x 1" tubing.

Does this souund like it will work?

The generator is an older early 70's model 4K Onan. Weight is HEAVY!! My guess is around 175 to 200#.
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Old 02-06-2007, 11:55 AM   #2
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Is that 1" or 1 1/2" tubing? Did you use any insulation around the genny box? And the $1 question, how loud is it on the inside of the bus?

Thanks
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Old 02-06-2007, 01:27 PM   #3
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Is this a liquid or air cooled genset? Liquid wouldn't be bad because you could remotely mount the radiator from the box. Heck...you could probably even tie it in with the heaters in the bus if you really wanted to. If it is air cooled, a sealed insulated box might not be the best bet for obvious reasons although some ducting with electric fans might alleviate the cooling issue while still allowing it to be housed in that box.
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Old 02-06-2007, 01:35 PM   #4
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If I were building one I would make one like this one. That compartment on the right is where the generator sits and you can see on half of the door an electric radiator fan is mounted to blow the hot air out.

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Old 02-06-2007, 01:45 PM   #5
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Its an air cooled Onan genny. According to Onan, the only incoming air that is required is an 8 x 12 opening from the outside of the box, along with a discharge opening the size of the "vacuum" chute. Any thing larger would definately be a benefit to the cooling airflow. Also any thing that is combustable has to be at least 6" away from the exhaust system inside.

So, it looks like I'll be about 8" from the exhaust tubing on the front side, about 4" from the top, and about 4" from the rear. Also will be about 4" all the way around the bottom of the genny mounting plate for additional air to draw from. Lining the inside will be 2" foam board and probably a sheet of aluminum instead of the 3/4" plywood. Although I do believe the aluminum will create a bit of an echo chamber. Only time will tell.

Arent the newer style of gennies covered with a plastic box?

Steve, mine already blows the heated cooling air out the bottom of the enclosure. I may be worng here, but wouldnt an extra fan blowing out create a problem with intake and cooling air?
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Old 02-06-2007, 01:59 PM   #6
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Quote:
Originally Posted by eggman
Steve, mine already blows the heated cooling air out the bottom of the enclosure.
I don't know what you mean by that? Your gennie has a fan on it? Or you have already built the compartment onto the bus and it has a fan on the bottom?

If you have a fan on your gennie already I would mount the gennie over a grate so it can just blow out of the compartment on it's own and put another screen in the door to allow air in.

Quote:
Originally Posted by eggman
but wouldnt an extra fan blowing out create a problem with intake and cooling air?
In the I posted as much air as is being blown out is also coming in the second screen letting in fresh air for the engine and circulating air for cooling. To make it work even better you could have the fan on one side and the inlet screen on the opposite side of the box. Maybe kitty-corner them if you have a long enough box.
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Old 02-06-2007, 02:15 PM   #7
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Steve, this is what the front of my generator looks like. It has a "vacu-flo" system for cooling.



During the last ice storm that we lost power, the air coming out de-iced my walkway in front of the door. Then I moved it back out of the way so we would have more room at the door way.
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Old 02-07-2007, 10:43 AM   #8
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Thanks for every ones help. Looks like I will be going with 1" x 1/8" wall square tubing. Mounted to the bus body with 3/8" bolts.
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95 IH 72 passenger transit school bus w/ DT466 and 545 Allison.
79 IH Scout II/392 (0.030 over) Hamilton Injected/727/D300/Full size axles/36" Swampers/Lockers/OBA/38 gal Custom fuel tank, roll bar, tube doors.
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Old 02-22-2007, 09:25 AM   #9
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Update: Bought steel on Wednesday, 2 sticks of 1" x 1/8" wall square tubing @ 24 feet long. Started cutting and welding yesterday and last night. About 9:30, 30 minutes after the closest Sears store closed, I run out of wire Go Figure. I had the top rack and the bottom welded, was getting ready to weld them together and set the genny in. Oh well. That'll teach me to look at the wire before I start a large project.
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95 IH 72 passenger transit school bus w/ DT466 and 545 Allison.
79 IH Scout II/392 (0.030 over) Hamilton Injected/727/D300/Full size axles/36" Swampers/Lockers/OBA/38 gal Custom fuel tank, roll bar, tube doors.
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Old 02-22-2007, 04:37 PM   #10
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You may want to consider large rubber gromets or washers to mount between the frame of the bus and the frame of the generator box. If you bolt the boxes together and have the rubber washers on top of the bus frame the weight of the geni box will rest on the rubber. Yes the box will move slightly with the bus, but the vibration from the geni in the bus should be much lessend than welding or bolting them together.

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