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Old 05-29-2016, 10:29 PM   #21
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
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Year: 1991
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Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
depending on your rim width you may be able to go up to 11R22.5 tires which would gain you a few MPH... you'll have to re-cal the speedometer... I didnt read to see what chassis this bus is on? if its IHC I have a fighting chance at getting you the proper dip switches for the speedometer..

-Christopher
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Old 05-30-2016, 02:23 AM   #22
Mini-Skoolie
 
Join Date: Jan 2016
Location: Austin, TX
Posts: 27
Sorry to hijack the thread, but where do you guys get new (or used) gears for your bus' differentials (or any other parts in general for that mater)? I'm used to being able to pop down to AutoZone and pick up whatever I need. But now... I have no clue!
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Old 05-30-2016, 06:02 AM   #23
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It may be easier and less expensive to purchase a complete used rear end in order to get the gears you want.

As far as where to go to get them, you need to think truck wrecking yard.

A quick Google search brought up this company: Truck Salvage Company
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Old 05-30-2016, 08:38 PM   #24
Mini-Skoolie
 
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Year: 1986
Coachwork: Boyerville
Chassis: GMC
Engine: 8.2 Detroit
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Quote:
Originally Posted by cadillackid View Post
depending on your rim width you may be able to go up to 11R22.5 tires which would gain you a few MPH... you'll have to re-cal the speedometer... I didnt read to see what chassis this bus is on? if its IHC I have a fighting chance at getting you the proper dip switches for the speedometer..

-Christopher
thanks Cadillac kid for the information
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Old 05-30-2016, 08:49 PM   #25
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first you need to find which rear end your bus has under it
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Old 06-06-2016, 07:24 PM   #26
Mini-Skoolie
 
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Year: 1986
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Engine: 8.2 Detroit
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8.2 L detroit diesel engine

I talk to a guy that sells used school buses and he said the 8.2L is a good engine as long as you do the PM on them at regular basis. He has seen 8.2 GMC Blue Bird buses with 300k on them and still running good. He told me the 586 rear end I have in the trolley will run that buses 55-60 mph at 3000 rpm and that is where the Detroit Diesel is design to run at. He said they are high rpm engine and running the engine at 3000 rpm is good for the engine.
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Old 06-06-2016, 07:57 PM   #27
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 5,018
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Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
always does seem like the Detroits like to run faster than the other variants..

are all detroits 2 cycle?

-Christopher
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Old 06-06-2016, 08:28 PM   #28
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Location: Montana
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Year: 1995
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Originally Posted by cadillackid View Post
are all detroits 2 cycle?

-Christopher
No, they are not.
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Old 06-06-2016, 09:11 PM   #29
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Most of the old 2 stroke DD's were designed to run at what are considered high RPM's compared to most diesels. My old 6v53 "screamer" had to stay at 3000 to 3300 to keep moving. And it would hit 3500 on most inclines (note that did NOT say "hills". That was a whole nuther matter).
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Old 06-06-2016, 10:00 PM   #30
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Join Date: Apr 2016
Location: on the land of tejas; state of mind
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Year: 95
Coachwork: Amtran ss-33
Chassis: Int 3800
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2 stroke detroits have very strong but narrow power band ~~~~~~~~~~~~ my oven setup 22.5's 4.44 ratio 444 engine 2500 rpm 60 mph .... with the calculator 3.55' ratio brings 75mph~~~~3.55 brings 72mph~~~~ radius of 24 vs 22.5 tires would gain some mph but i cant remember how much. tires and rims on craigslist are relatively cheap pick and choose the cheap ones one at a time and build your reserves imo.
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