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Old 08-04-2015, 11:56 PM   #1
Skoolie
 
Join Date: Aug 2015
Location: Oregon
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Year: 1984
Coachwork: International Harvester
Chassis: S1700
Engine: 6.9l IDI
Rated Cap: 27 (adults)
1984 International Air Force Bus

The MEAN MUCCHINE

I purchased a sweet old 6.9l diesel, international airforce bus. Let me say that this thing is sweet. having replaced its cooked alternator i drove it 450 right off the bat over some pretty serious mountain passes coming up from sanfrancisco into oregon. it didnt go fast but it didnt want to stop either haha. ive begun my conversion process, seats out, floor in bed built and everything else is sort of built just enough to use. Im already living in it and loving it. the next step for me is to turbo charge this thing. If anyone has any input or experience with adding a turbo charger setup to one of these pre powerstroke idi diesels I would appreciate all the help i can get.
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Old 08-05-2015, 12:21 AM   #2
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Location: South Carolina, but headed back to Michigan
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Year: 1991
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Engine: DT360
Check out Oilburners.net. There is a lot of good info on there about the Ford IDI diesels. Do enough reading on there and you may decide not to go with a turbo.

Any plans on tearing into the bus? Pictures are always great, too.
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Old 08-05-2015, 12:40 AM   #3
Skoolie
 
Join Date: Aug 2015
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Posts: 156
Year: 1984
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Chassis: S1700
Engine: 6.9l IDI
Rated Cap: 27 (adults)
really, hmm. all my research suggests ill gain about 70-80hp and a 20-30% gain in fuel economy on flat ground with the banks sidewinder setup tuned right at relatively low psi. Ill upload pictures tomorrow when i get a chance to put them on my computer. The guy i bought the bus from had pulled the seats out already and glued a hardwood floor down. I would have liked to put insulation in for warmth and noise purposes, but he sort of installed the floor in a way that is not easy to undo without totally emptying the bus.
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Old 08-05-2015, 02:45 AM   #4
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All my research shows you'll be replacing head gaskets if you don't use head studs. I doubt the 80hp number.
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Old 08-05-2015, 03:40 AM   #5
Skoolie
 
Join Date: Aug 2015
Location: Oregon
Posts: 156
Year: 1984
Coachwork: International Harvester
Chassis: S1700
Engine: 6.9l IDI
Rated Cap: 27 (adults)
Everything I've read has been talking about adding the turbo these engines in a f250, or f350. But I can't seem to find any information from anyone that has actually done it much less on a bus, which is very frustrating. I can comfortably cruise the bus at 60-65 as it is, but when I hit a hill of any length or grade I have to downshift to 3rd to maintain 45 which is not super cool on the interstate. In the end id like to get a faster ratio differential and a turbo to provide the needed extra little push, plus the engine just feels like it's not working as hard as it wants to. I bought this for cross country travel/ full time living.
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Old 08-05-2015, 03:42 AM   #6
Skoolie
 
Join Date: Aug 2015
Location: Oregon
Posts: 156
Year: 1984
Coachwork: International Harvester
Chassis: S1700
Engine: 6.9l IDI
Rated Cap: 27 (adults)
I'm hoping to find someone else that has this era of s1700 Air Force bus that has specific knowledge or at least someone that has has this engine and has made adjustments to get more power/fuel economy out her
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Old 08-05-2015, 09:41 PM   #7
Skoolie
 
Join Date: Aug 2015
Location: Oregon
Posts: 156
Year: 1984
Coachwork: International Harvester
Chassis: S1700
Engine: 6.9l IDI
Rated Cap: 27 (adults)
So I either have an allison 545 or 643???? is there any good replacement for these, or if not, is there an overdrived unit? gear vendor? auxilary trans? is the solution a two speed rear end? id like to be able to cruise at 75 even 80 on flat desert roads like the 140 or I80 in the nebraska flats etc. and right now it seems like 70 is my top speed. any help would be appreciated, i cant seem to figure out how to add pictures here i dont have any online and the only option seems to be adding links...
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Old 08-05-2015, 09:56 PM   #8
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Location: Eustis FLORIDA
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Year: 1992
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Seriously... 70 isn't fast enough?
I'm lucky to get 65 downhill.
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Old 08-05-2015, 09:59 PM   #9
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You mean 80 as in 77, 78, 79, 80?? You've got the wrong bus for that no matter what you do to it.

My bus probably would do 80 but thats way too fast for something that weight and not built to go fast. Just my opinion though....

You'll have a 545.
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Old 08-05-2015, 11:02 PM   #10
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Quote:
Originally Posted by Famousinternetjesus View Post
right now it seems like 70 is my top speed.
Feel blessed 70 is your top speed. Mine is 50! I'm going to change the gears, but I know I'll lose torque going up hill. I'm aiming for 64/65 mph @ 2300 rpm in my bus and NOT overextending the bus's braking abilities. ANYONE can go fast, but stopping is MORE important!!!!!
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