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Old 03-24-2019, 03:12 AM   #1
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Thinking outside of the (engine compartment) box

In the past decade, anytime I am in the presence of diesel mechanics, I always ask them the same question " which engine is best for a type D bus?" They will often answer "none" because they feel there is not adequate cooling in the engine box. Are there any good solutions for this?
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Old 03-24-2019, 03:30 AM   #2
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In the past decade, anytime I am in the presence of diesel mechanics, I always ask them the same question " which engine is best for a type D bus?" They will often answer "none" because they feel there is not adequate cooling in the engine box. Are there any good solutions for this?
Rear engine buses have the most cooling issues.
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Old 03-24-2019, 05:49 AM   #3
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Rear engine buses have the most cooling issues.
Has anyone ever though of putting a radiator on the roof directly above the engine compartment
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Old 03-24-2019, 09:52 AM   #4
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Has anyone ever though of putting a radiator on the roof directly above the engine compartment
At one time I wanted to put a Nissan L6 motor from a 280Z into my 1984 pickup and replace the L4. To squeeze it in, I was thinking of the radiator on the roof.
Then I bought a Weber carb and an aftermarket long-pipe exhaust header, and I never looked back. She would easy crawl up a 45° incline at 600 RPM with my foot barely on the gas pedal, and I could just feather the gas even at that low RMP, and she would pull strong.
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Old 03-27-2019, 03:23 PM   #5
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You could do it sure. Just would need to build some sort of shielding and housing for it and the hoses. But ductwork underneath the bus might be a good alternative, or even locating the rad to the front if possible!
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Old 03-27-2019, 08:21 PM   #6
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You could do it sure. Just would need to build some sort of shielding and housing for it and the hoses. But ductwork underneath the bus might be a good alternative, or even locating the rad to the front if possible!
The front was my first thought - especially since I could tap into the line for heating, but it would mean a 30+ foot long tube for the antifreeze to run through, and then 30' back. On top of the bus would only be about 9 feet and could be run through the passenger compartment in the corner - well insulated and protected. Is the length a valid fear? Given the brick shape of busses, I think air flow would be better on top of the bus than plastered on the front of the bus. Lay the radiator flat on the roof, but elevate the rear 4-5"....build a simple vented enclose around it. The sun might heat the fluid up to 130 degrees when parked, but in the big picture, this is insignificant to the engine operating temperature.
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Old 03-27-2019, 08:31 PM   #7
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You need to consider the volume that would require pumping. The water pump would need to be strong enough to go upwards and around. If it’s front mounted the length isn’t a concern really. Many of our buses had inside heaters very far from the engine and rad. Same exact concept.
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Old 03-27-2019, 11:00 PM   #8
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You need to consider the volume that would require pumping. The water pump would need to be strong enough to go upwards and around. If it’s front mounted the length isn’t a concern really. Many of our buses had inside heaters very far from the engine and rad. Same exact concept.

Would an auxiliary electric water pump be useful? Maybe I am overly paranoid but I am concerned also about the physical safety of a radiator up front..minor fender benders...people backing up, etc. although it would be really cool - but time consuming - to build a "nose" for a type D pusher bus...to help some of the aerodynamics
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Old 03-27-2019, 11:26 PM   #9
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Biggest problem with RE bus cooling is getting the air across the radiator. A lot of HP is used for the cooling fan. If putting a radiator on the roof it would work best to use a short radiator mounted vertically across the width of the roof with a scoop to direct the air through the radiator. Mounted horizontally electric cooling fans would be needed like a roof mounted AC condenser.

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Old 03-28-2019, 04:27 AM   #10
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Biggest problem with RE bus cooling is getting the air across the radiator. A lot of HP is used for the cooling fan. If putting a radiator on the roof it would work best to use a short radiator mounted vertically across the width of the roof with a scoop to direct the air through the radiator. Mounted horizontally electric cooling fans would be needed like a roof mounted AC condenser.

Ted
Thats what I was thinking - a 6 or 7' wide radiator mounted across the width of the bus....raised 4-5" in the back with some kind of shroud/scoop to direct more air to it..and a fan (probably a couple of fans) to provide air at lower vehicle speeds. I may have to use 2 radiators - I have not seen a 7' wide radiator.
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