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Old 04-02-2015, 09:34 PM   #1
Bus Nut
 
Join Date: Apr 2009
Posts: 287
Year: 1986
Coachwork: Crown Super Coach
Chassis: Built on a Crown Chassis
Engine: 300HP BIG CAM TURBO 855
Rated Cap: 78
99 International Thomas 7.3 Allison MT 643

Cool thing about this Bus is that it does have a rear axle ratio of 3.21........and it's also in pretty damn nice condition.......It is mine so no disclaimer I do intend to make a profit for the time and energy and research so let's not get bent about that.........priced it well I think.

Pretty Nice little Bus cruises right in the sweet spot at 75 and beyond.......thanks to that sweet little axle ratio.............. hope someone likes it. Have a feeling it will go away pretty quick.

1999 Thomas 7 3 Liter International Allison MT643 Trans Extra Nice | eBay
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File Type: jpg thomas....JPG (80.9 KB, 15 views)
File Type: jpg thomas..........JPG (107.2 KB, 17 views)
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Old 04-02-2015, 11:00 PM   #2
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Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,439
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Oh yes.. Those pug-nose buses are so strange, yet awkwardly cute!
It looks like the dash cluster has some dead instruments. Not too surprising, really. That IH cluster is plagued with issues. I'm looking for a new board for mine.

I have to ask, though, is this really a mechanical 7.3l? Firstly, I would be surprised if it was able to 75 or 80mph if it were a 7.3l IDI. I'd be even more surprised if it were a 7.3l IDI with a turbo. Secondly, most any International 7.3l engine from 1994 upwards is likely to be the HEUI driven 7.3l, also known as the T444e. A good engine (I like mine), but far from a pure mechanical creature.
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Old 04-02-2015, 11:01 PM   #3
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
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Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Also, what are the tire sizes? From the pictures it appears that the rear tires are smaller than the front.
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Old 04-02-2015, 11:31 PM   #4
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Join Date: Apr 2009
Posts: 287
Year: 1986
Coachwork: Crown Super Coach
Chassis: Built on a Crown Chassis
Engine: 300HP BIG CAM TURBO 855
Rated Cap: 78
Good observations from every one. Tires are the same front and back. I believe those are 19.5 inch rims as to leave interior floor absent the wheel well humps.

As to the accuracy of speed. I believe speed and ease of obtaining it and sustain it is attributable to the ale ratio. 3.21

As to the instrument panel. I am told that once the ignition is on the gauges go to where they belong.

As to the T444 being mechanical, turbo charged or computer controlled. I based my observation to that the result of the MT643 transmission. My experience, which for sure is not inclusive of all things BUS: But in my experience I have had mechanical engines mated with a trans with an ECU... (C.8.3L to a BR-400). But not the other way around. And electronic engine to a mechanical trans. Di feel free to correct or amend my observations as you see fit.
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Old 04-04-2015, 04:48 PM   #5
Bus Nut
 
Join Date: Apr 2009
Posts: 287
Year: 1986
Coachwork: Crown Super Coach
Chassis: Built on a Crown Chassis
Engine: 300HP BIG CAM TURBO 855
Rated Cap: 78
Just to follow up on this..............this is NOT a 99 ............but in fact it is a 96. Every thing I have read suggests it IS a computerized engine. And also suggests that by this year it would also be turbo charged.....The Allison MT643 IS a mechanical Transmission. I have zero experience with an electronic engine, if that is what this 7.3 is, mated to a mechanical transmission. I DO have experience with a mechanical engine mated to a electronic transmission so I don't preclude the possibility. I JUST DON'T KNOW.........So if any of you guys want to educate me to the 1996 7.3 and its various permutations I'm all ears. I simply have zero experience with these engines.

As to speed and the legitimacy of my claim of 80 mph. I owned a TC1000 same length as this bus though a transit style. That bus had the Cummins 5.9L rated at 160HP.........it had a final drive ratio of 1:1 and that ran through an axle ratio of 3.24.........that Blue Bird would run out quietly at 75MPH on the flats...........by my reading these 7.3 were pretty much standard at 190 HP in school buses of this ERA....so would 80 mph be a stretch? Not even...


The 7.3L is one engine I know very little about. I don't have the VIN or I would have done a conversion of that VIN to find out exactly what engine is in that bus.............Any help at knowing what's in this bus is appreciated.......
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Old 04-04-2015, 06:15 PM   #6
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Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 539
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
7.3 is a good engine, MT 643 is a great transmission
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Old 04-04-2015, 06:28 PM   #7
Bus Nut
 
Join Date: Apr 2009
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Chassis: Built on a Crown Chassis
Engine: 300HP BIG CAM TURBO 855
Rated Cap: 78
yeah Kubla i've read enough to know the 7.3 is a revered engine that played into the purchase of this bus.........most importantly to me was the low (numerically) axle ratio.

BUT. and it's a big BUT the whole International/Ford collaboration.........the Ford rebranding of this engine and as well some changes they made, wrist pins, modified pistons.......hardened valves when they added the turbo different cranks for the Mechanical different cranks for the electronic...........and of course the T444E and the Navistar tweaks and different electronics used and the in the Mythology both engines Powerstroke and the Navistar being discussed in the same breath as the same engine when in fact they are not. Basically the same is not the Same..............So it's confusing to me first to fine information about a T444E and finding it in a discussion as a PowerStroke.........I just want to glean information on the engine in this bus. Know being the operative word. Not speculate, not appears to be or could be. I will simply put it on the back burner snag the VIN and find out exactly what is in this 96 and take my exploration and learning from there. A lot of folks like these engines for the most part..........but there were glitches along the way. I simply want to know what I have.
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Old 04-04-2015, 07:34 PM   #8
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Join Date: Sep 2014
Posts: 546
All this talk about MPH inspired me. On my glampout return trip I decided to "see what she'll do".
I had forgotten to unplug the GPS while camped for quite a while so the
averages are way low.

2000 BB TC1000 5.9 with 3.54 diff.
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Old 04-05-2015, 04:14 PM   #9
Bus Nut
 
Join Date: Apr 2009
Posts: 287
Year: 1986
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Chassis: Built on a Crown Chassis
Engine: 300HP BIG CAM TURBO 855
Rated Cap: 78
84MPH.........with a 5.9 with 160 HP is just fine isn't it? Really don't understand why your fuel mileage is below 10 to 12 though..............I was regularly seeing 12 MPG in my TC1000 while cruising at 67 MPH
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Old 04-05-2015, 04:36 PM   #10
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Join Date: Sep 2014
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Quote:
Originally Posted by mokibrabrant View Post
84MPH.........with a 5.9 with 160 HP is just fine isn't it? Really don't understand why your fuel mileage is below 10 to 12 though..............I was regularly seeing 12 MPG in my TC1000 while cruising at 67 MPH
The mpg info is left over from my old gasser. Since I took the pic, I have entered the new info of 12 mpg for the 5.9 and lower fuel prices too.
When I set that, diesel was about $4 and gas was about 3.50.
My 5.9 is tagged as 185 hp.
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