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Old 03-14-2019, 05:53 AM   #1
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Engine Too Small!?

So I'm browsing the auctions this morning and found something funny.
They're selling 2011 buses in AZ because the emissions engines are too wimpy. I guess this is the kind of school district that typically bought 8.3's till they became unavailable.

https://www.publicsurplus.com/sms/au...ew?auc=2297682
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WAS TAKEN OUT OF SERVICE BECAUSE ENGINE TOO SMALL
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Old 03-14-2019, 06:58 AM   #2
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A lot of Arizona is flat, but from Mesa to Heber is a 7000 ft difference. Other parts of the state have some real mountains too. So I can see where these buses would have a real struggle.
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Old 03-14-2019, 07:29 AM   #3
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I don't know if I buy that. The ISB was available with up to 300hp IIRC.

The reason they eliminated the ISC is because it's power production overlapped the ISB and ISL. No need for cummins to have 3 engine lines when 2 will suffice.

I'd bet they have issues with the emissions on this guy. We've had a lot of trouble with the 2010 and 2011 models. Seems the '10 emissions systems in the early years aren't as robust as the later years and are expensive to repair. A lot of injectors, egr coolers, turbos, particulate filters and catalysts have been replaced to keep them in service.

Emissions equipment on diesel engines sucks. You take what once was a reliable engine and knock years off it's life with that crap. That's why manufacturers are bring back gasoline/propane/natural gas engines. A set of plugs every 50k miles is cheaper then 1 new diesel injector.
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Old 03-14-2019, 08:54 AM   #4
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That's funny.
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Old 03-14-2019, 08:57 AM   #5
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300 hp might be available in a pickup, but seems 200hp or so is the most available in buses.
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Old 03-14-2019, 08:59 AM   #6
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Originally Posted by Ronnie View Post
300 hp might be available in a pickup, but seems 200hp or so is the most available in buses.
I have for sure seen 230hp ISB, in fact the recent post of buses in Oregon I believe are all 230hp ISB. I haven't seen above that but I haven't really been looking either.
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Old 03-14-2019, 09:22 AM   #7
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https://www.cummins.com/engines/isb6...n=School%20Bus

It was offered. What the districts usually buy is something completely different.
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Old 03-14-2019, 10:51 AM   #8
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Originally Posted by brokedown View Post
I have for sure seen 230hp ISB, in fact the recent post of buses in Oregon I believe are all 230hp ISB. I haven't seen above that but I haven't really been looking either.
I just checked an Oregon listing and the description says "CM550 260hp". CM550=ISB. Are they not allowed to reprogram/mod these?
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Old 03-14-2019, 05:58 PM   #9
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Originally Posted by Booyah45828 View Post
https://www.cummins.com/engines/isb6...n=School%20Bus

It was offered. What the districts usually buy is something completely different.
Thanks for the link. I wonder what would be involved in bringing up the HP on these buses?
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Old 03-14-2019, 06:38 PM   #10
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Thanks for the link. I wonder what would be involved in bringing up the HP on these buses?
Maybe a computer tune and exhaust mod would help? I also hear about people messing with propane injection on older engines.


I forgot to mention that the 2010 model has the 6.7 version of the ISB with full blown emission equipment. It performs worse than the 5.9.
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