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Old 02-07-2021, 02:48 PM   #1
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Join Date: Jun 2020
Location: Long Beach, CA
Posts: 1,075
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000, 40' MPV
Engine: 5.9 Cummins/B300 trans
Rated Cap: U/K
12v 5.9 RPM

I have a '98 Blue Bird with a 5.9 and a B-300 trans. It's showing almost 2200 RPM at 65 in 5th. I seem to remember max RPM is around 2600, is that correct? That would make 65 - 70 mph within the safe range?
Thanks
Rick

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Old 02-07-2021, 05:25 PM   #2
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Location: Virginia
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Year: 1971
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Chassis: International Loadstar 1700
Engine: 345 international V-8
max rpm in what way? The engine can be run up to 3200 without trouble, 4000 if you change valve springs. However in a school bus it is likely governed around 2600 rpm as you mentioned. 2200-2500 is a real good cruising speed for this engine for long life and decent fuel mileage.
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Old 02-07-2021, 05:47 PM   #3
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Join Date: Jun 2020
Location: Long Beach, CA
Posts: 1,075
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000, 40' MPV
Engine: 5.9 Cummins/B300 trans
Rated Cap: U/K
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Originally Posted by Ronnie View Post
max rpm in what way? The engine can be run up to 3200 without trouble, 4000 if you change valve springs. However in a school bus it is likely governed around 2600 rpm as you mentioned. 2200-2500 is a real good cruising speed for this engine for long life and decent fuel mileage.
Thanks for the info. I'm not planning on racing anyone but if I get up to 70 mph I'll still be in the safe zone
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Old 02-07-2021, 11:08 PM   #4
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Engine-wise, yes.
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