Swamp cooler

[MagnoliaBus]

I think i'm gonna follow Clifford with an air to air cooler modification...

I removed the old radiator last week-end plus that big fan and gearbox...all good for scrap.
Since i'm going to install a new (37" x 42" x 2 1/4" core) rad with nine 12" electric fan (24V - 2000 CFM), why not install an air to air charge cooler (26" x 25" x 2 5/8" core) on the right side door with four electric fan ?
And like Clifford said ( from this post https://www.busconversionmagazine.com/forum/index.php?topic=33934.0) i will remove the below blower aftercooler. And maybe also remove the engine mounted transmission oil cooler.

I think there is a wider temperature difference between ambient air and turbocharged air, hence more cooling capacity, than trying to cool the same turbocharged air with engine coolant temperature.

[chessie4905]

Trouble with those intercoolers is they transfer the most heat from turbo when engine is working the hardest on a steep grade, just when you need engine cooling the most. Same with transmission cooler.

[Geoff]

Given that you are open to non-enginereed solutions, I think a big swamp cooler on your roof is the better solution, just watch out for those low clearances

[luvrbus]

Go for the air to air,the high hp 2 stroke marine engines don't use a after cooler they use the sea water intercooler and make a ton of hp with the colder air 

[MagnoliaBus]

Go for the air to air,the high hp 2 stroke marine engines don't use a after cooler they use the sea water intercooler and make a ton of hp with the colder air

Is there some specs from DD for air to air sizing ? There are many with 4 " inlet/ outlet but different size of core...i found on with 4 1/2" inlet/outlet but having a small core !?

[uncle ned]

Just wish I could find room on Huggy to put a  air to air cooler on her.

I have the cooler just can not find room.

The engine and radiator and v730 fills up the compartment.

Uncle ned

[chessie4905]

Can't you install it on passenger side, inside the door. Cut a large square hole in door and cover with similar mesh to match other side.

[uncle ned]

The right side has the big cooler for the v730 and fans

It is not connected to the cooler on the engine.

uncle ned

[Geoff]

I would love it if someone would test the temperatures with an air to air cooler when the turbo exhaust is at 600f.  The after cooler will bring the air temp to 180f with a good radiator.

[chessie4905]

Since the air temperature is about 100 or more degrees cooler, than the coolant in the block, a properly sized unit should be at least comparable without adding all that heat to the coolant. Plus, no worry about a potential of the intercooler leaking antifreeze in to engine posibility. I wonder if they have a tendency to plug over time like radiators? I have DDA brochures from the mid 80s that had three different engine configurations. One was an air to air cooling, the other two were called " advanced charge air cooling". Those two used intercoolers. At that time they were touting fuel economy.

[luvrbus]

The after coolers are more the size of cabin heater core and work about the same ,they come in different passes like 2,3 or 4 to try and add more cooling to the air.You can take a aftercooled 350 hp 3406 Cat engine change it over to a intercooler will a few mods they jump up 425 hp easy   

[MagnoliaBus]

From what i can find, i think the 8v92 would need aroud 1788 cfm @ 2100 rpm.
From the Bell Intercooler website, it show that a 6" x 26.6" x 3.5 " core is rated at 1790 cfm.

[chessie4905]

From  9-84 dda brochure, the 8V-92 silver at 475hp is 1400cfm at 2100rpm. 2950 cfm exhaust flow.
13,400 btu. Heat rejection.

[TomC]

I air to air intercooled my 8V-71 keeping the 18.7:1 high compression pistons. Course I only went up to 7G75 injectors. But it still dynoe'd out at 375hp and 1125lb/ft torque. Works well-just have to use misters when above 90 degrees, or sometimes on a long pull. Good Luck, TomC