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Old 03-18-2016, 08:08 AM   #1
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road trip

well i took my first road trip, bus ran great. from va to il. i averaged 6.5 mpg. yikes. dont know if my gauges are right but it was running 2300 rpm at 62 mph. in the mountains i never dropped below 50 mph. i have an oil leak it looks like its coming from the timing chain cover behind the water pump pully. i looked at the gasket kit and there is a round gasket im thinking is the problem, any thoughts? anyone change these out? thanks.
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Old 03-18-2016, 08:24 AM   #2
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Nice to hear about you taking it out on the road, Dave.
Someone who knows about Cummins will be along soon, I'm sure.
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Old 03-18-2016, 10:23 AM   #3
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If it is a Cummins...they are happiest at about 17-1800 RPM's. Sounds like you have gearing made for lower top speeds if you need to turn 2300 at 62. But then, most skoolies are not geared for the highway.
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Old 03-18-2016, 11:08 AM   #4
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Im at about 2300 rpm at 62 with my 466.
4.44 rear.
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Old 03-18-2016, 11:24 AM   #5
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CB - Which tranny do you have? I'm looking into swapping rear ends on mine....I have a 5.38(I think) with the good 'ol AT545. right now I'm screaming at 57 MPH at a governed 2600rpm. Even if I could hit 60-65 at 2300-2400 I would be so much happier (as well as my engine!). I was looking into the 4.11-4.4 range. Do you still have plenty of power at slower speeds?

Thankx!

John
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Old 03-18-2016, 12:54 PM   #6
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Yeah for only having a 190hp DT, it pulls NICELY. It has a 643 tranny. Feels so good going into every gear. SO right....
My bus is 40' fwiw
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Old 03-18-2016, 01:05 PM   #7
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I've got a 3.54 axle and I have to pull 2200 revs to do 60.
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Old 03-18-2016, 07:09 PM   #8
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my bus was used to transport sports teams, i was hoping for a better gear ratio. but i plan on towing a vehicle so i guess it will work out ok.i like keeping the peddle floored so i think ill adjust it down to 55 mph .
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Old 03-18-2016, 10:37 PM   #9
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The Cummins ISB/ISC/ISL family of engines, the IHC T444/VT365/MaxxForce7/DT360/DT466, and the Cat 3208/3116/3126/C7 all have redlines at 2600 RPM's.

The heavy duty diesels like the Detroit -71, -92, Series 60, Series 50, and the Cummins 743/855/Big Cam engines all have redlines at 2100 RPM's.

Running any of them at the redline won't hurt them. In fact, running a 2-cycle DD at redline is actually the preferred place to run them.

Running a small Cummins at 2300 RPM's is going to be right about in the sweet spot for it.

Figuring out what rear gear with your size tires to get the speed you want is a straight forward math problem. There are several places online that have the formula set up that all you have to do is input the correct numbers and it will spit our your gear ratio.

For those that do not have OD transmissions 4.10 gears usually mean an easy cruising speed of 70 MPH with engines that turn 2600 RPM's. You will need 3.56 gears if you have an engine that turns 2100 RPM's if you want to go 70 MPH.
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Old 03-18-2016, 11:43 PM   #10
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Thanks Cowlitz. That's reassuring. I just need to learn to drive this bus like it still belongs to someone else. The engine sounds healthy and it doesn't overheat at all. I was uncomfortable about keeping my foot on the firewall while on the highway but apparently it's a fairly common thing.

I don't think I'm going to need more than 60 mph, so I'll definitely be in the slow lane in WA. This medium bus just doesn't feel all that stable on county roads. The wheel base is only about 18" longer than my K-5 Blazer. A few consecutive bumps and this bus can start bucking. Maybe that's shocks? I'm surprised it doesn't go a little faster, but then it is basically a pickup engine and this bus weighs a number of times more than a pickup.

From your description I think I've got a fairly healthy beast here. There is a little deferred maintenance to catch up on and this bus obviously sat for a while before being sold. I'm still not used to driving my house to go shopping but I'm learning to like it.

Going to see America. Worked overseas most of my life. Weird how life goes.

Thanks.
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