Originally Posted by Wanda bus
Bus is a navistar 3800 T444E. Also, want to reprogram the governor if anyone knows anything about a 95 model. I have read lots and have a diesel mechanic to help. Apparently no computer until the next year.
But anyways, I will ask my mechanic about upgrading the alternator and if it would be advisable for this use. Any other ideas for cooling the driver? My bus never had an air conditioner and I was informed that putting an indash ac while costly could also damage or be too much for the engine since it was never built to run an ac.
If it does not have an ECM, then you have a mechanical indirect injected T444, not the electronic, direct injected T444E. This is an important distinction as they are completely different engines sharing only a displacement.
Who informed you that your engine was never built to handle AC? The same engine was installed in pickups which certainly had AC systems. I don't believe building an AC system for the driver only would be a significant load at highway speeds for a bus. Adding 2 or 3 compressors to cool the whole bus is a much larger load and can require some interesting fab work to make it happen. The later 7.3s definitely were able to do it and propel a 40 foot bus with only 210HP.
Look for a data sticker on the engine, it'll tell us which engine it is and how much power it has. Truck engines are offered with a variety of power ratings. The differential gear ratio and transmission will dictate your maximum possible speed regardless of governor settings.