Airflow problems, need opinions...

[yetibone]

Yeah, the air's fine under there, just as long as you get it from in front of the engine compartment. Screen out any debris.

[Mikey 1972GL]

I agree with drawing air from underneath and it wouldn't hurt to use some kind of a screen. Also, the larger NACA ducks might be a good step if this doesn't work.

No original ideas, but I just thought another 2 cents wouldn't hurt.

Finaly, the bus looks great :righton: I can't wait to see it in person.

Mike

[Sandeep]

I too an a fan of grabbing additional air from under the vehicle. I'm using ducts for extra air to my oil cooler. You should be able to fabricate a scoop that is W-I-D-E and connects to the torsion tube and feeds some furnace ducting that directs air to your rad.

Sandeep

[Bullyboy]

I think the scoops would be fine if there was something that was drawning the air in either by a fan/blower or a natural flow. By having an opening of the air to go out the back of the van. have you tried opening the rear hatch a 1/2" or so to see if the air woud flow thru the bus any better. I would say a pop out window on the rear hatch would get the air flowing pretty good thru the back.
Just my opinion mind you.... it just seems the air either needs assistance getting in, or a natural source to get out. Kind of like the wind blowing into your bug thru the vent windows in the summer. then you pop open the rear pop outs and give that air someplace to go and whoosh its much cooler.
I'm no scientist, but I figured it is worth a try

[Panelfantastic]

Bullyboy,
I have added louvers to the rear hatch just below the window so it has a way to exhaust out the hot air. I also have a safari rear window and tried driving with it open, it didn't make any diff. Good ideas all around.
I've just got to get more fresh air coming in...

[Panelfantastic]

This is turning out to be more difficult than I thought. There is not a good place to come through the floor with my ducting... ideally, I would come up right in front of the torsion tube and it's a straight shot up the rear hump/firewall but there is too much frame and support in this area to start hacking. I would have to move forward at least a couple feet to clear everything. Imagine opening my side cargo door and seeing a pair of 6" tubes coming up out of the center of the floor and snaking back and up to the rear deck !
No, it's not a westy. No, I don't ever plan to camp in it or haul anything but butt, but that would just look like hell.
There is a fairly good place right in front of the rear wheels but then the duct catches everything the front tires can pick up... and if they hung down very much at all (which they need to do, right?) they would really stick out.
More head scratching to do...

EDIT: New twin NACAs ordered today to replace the singles.

[NO_H2O]

Weld up a wide/low profile duct from sheet metal then transition to a round duct, kind-a like a woodstove hood.

[boygenius]

I say go with the air from under the bus. Don't ruin the clean look of your bus with extra scoops. I would say what everybody else said, run a large wide scoop under your bus the entire width of your bus. Place a metal mesh over the front to keep trash bags and such from clogging your cooling system. Although also note that the airdam which you spent so much time making will cut down on the air that flows under your bus just like it is supposed to do. Have you considered any radiator additives like water wetter. Try to picture your bus in a wind tunnel and ask your self where would the air be flowing around the bus. You will have good dense air in the front but the rest of the way back the air would be turbulant. If you want to get good source of air for the radiator you might want to run the ducting all the way to the front of the bus and cut some intake holes into the front air dam. You could make some large rectangle shaped ducts to channel the air to the engine compartment. Paint them flat black so they are not as visable when looking at them. Also you might want to make the ends adjustable since they might need to project a little from the front to get into the good clean air. Just a few thought to consider.

[NO_H2O]

Why not pick up the air at the air damn (small round ducts) and transition to to a 2"x10" sheet metal chase under the floor, then transition to a round duct and into the back at the rear tray.