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Old 10-17-2016, 03:24 AM   #1
New Member
 
Join Date: Aug 2016
Location: Florence Oregon
Posts: 4
Year: 2000
Coachwork: Amtran
Chassis: RE 35'
Engine: T444E
Rated Cap: 72 passenger
T444E safe operating RPMs at highway speeds

How many RPMs can I safely run with a T444E on a freeway? My 35' 2000 International RE with a T444E is running around 2500 RPMs at 58 to 60 MPH. What are the safe RPMs for the T444E ? How many RMPs are these engines designed to run at highways speeds? I would like to be able to cruise between 65 and 70 on the freeway. Do I need to have the rear end ratios changed? Or can the T444E handle 3000 RPMs at freeway speeds?
steveningham is offline   Reply With Quote
Old 10-17-2016, 04:47 AM   #2
Bus Nut
 
Join Date: Jul 2011
Location: Winlcok, WA
Posts: 994
2500-2600 RPM's is about as tight as I would want to turn one of those on a regular basis.

3000 RPM's is really asking for trouble IMHO.
cowlitzcoach is offline   Reply With Quote
Old 10-17-2016, 08:05 AM   #3
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 3,079
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
ther T-444E should be limited to 2700 from the factory... maybe the 210 HP version is 3000? I do know they max out their power and torque curve at 2300.. which is a good optimal balance of economy and power there...

the bottom end on these things can take more.. ford ran them up to 3200, but the fords i believe have a slightly thicker head gasket than the IHC so you can run higher RPM wothout slapping a piston at the top of the cylinder.

even with 210 HP, i cant imagine being able to have enough power to run a big heavy RE bus at 65-70 with a T-444E..

when you regear you also lose torque at the tires... a good test is does your bus want to slow down any on mild hills? if you are floored and drop speed a little now on hills you would drop speed even more if you re-geared the rear...

-Christopher
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