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Old 07-15-2015, 05:13 PM   #211
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I am replacing the clutch fan on my Cummins with an electric. Less drag on the engine too. They take a surprising amount of energy to turn.

You still have more drag on the alternator though...
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Old 07-15-2015, 05:20 PM   #212
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Sorry to read of the heating problems, but the rest of your trip seemed to be a great adventure! Glad you made it safely home
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Old 07-15-2015, 06:41 PM   #213
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I have replaced the 90 amp alt it came with, with a 250 amp unit so there will indeed be more drag. That's one of my reasons for getting rid of the mechanical fan. But the added pull of the electrical fan won't add much at all to the total.
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Old 07-15-2015, 08:19 PM   #214
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Sorry to hear about the overheating. It's a scary thing when you are far from home. On my trip from Texas, I drove the bus differently then the trip from Tennessee. I kept the rpms over 2000 at all times to make sure that everything was fully engaged in the tranny. When I hit the hills and the temp did climb, the fan clutch definitely engaged. If you don't hear it, yours is not working. There is no mistaking it. No such thing as "I wonder if my fan clutch is working?" because you will hear it. 212* sounds about right. Even when pulling my Excursion on the first try, it brought the temp back down to just above 180*.
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Old 07-15-2015, 09:00 PM   #215
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Sorry to hear about the overheating. It's a scary thing when you are far from home. On my trip from Texas, I drove the bus differently then the trip from Tennessee. I kept the rpms over 2000 at all times to make sure that everything was fully engaged in the tranny. When I hit the hills and the temp did climb, the fan clutch definitely engaged. If you don't hear it, yours is not working. There is no mistaking it. No such thing as "I wonder if my fan clutch is working?" because you will hear it. 212* sounds about right. Even when pulling my Excursion on the first try, it brought the temp back down to just above 180*.
Thanks CC,
You just kinda proved my thought on the clutch fan. I've never "heard the fan roar" It always looks like it is spinning. I've always heard you can stop a fan if the clutch is not engaged. I like my fingers though I still want to look into a bigger radiator and intercooler though. I haven't yet, but I would like to still turn up the power some. I won't do it though, unless I can cool it also. That's just the hp junkie in me though. I did find I could run 80 mph to North Dakota. I found that does come at a price though... Over 15 gallons in a hour. Since my odo is off, it's hard to figure mpg, but I figure that is just about 5 mpg or little less. Across Nebraska I was at 5.1 gallons per hour at 67 mph. That is probably as flat and no wind as you can get in the US. 13 mpg
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Old 07-15-2015, 10:15 PM   #216
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Most of my trip was 45-50 mph. Sometimes I drove 55 if I was feeling froggy. I hit 60 a couple of times when going downhill. I'm just not comfortable driving at over 2500 revs all day. I much prefer 2200 and so do my ears.

The clutch is more expensive then I would have imagined. They seem to be several hundred dollars. I have seen them used from wrecking yards.
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Old 07-15-2015, 10:35 PM   #217
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With 4.10's now, 67mph was just hair over 2300 rpm's. I could just start to hear the turbo. It really seamed to run well there. Any lower it would bog down some in the hills, faster and the turbo would start winding up, and heat would start going up.
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Old 07-16-2015, 12:51 AM   #218
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With 4.10's now, 67mph was just hair over 2300 rpm's. I could just start to hear the turbo. It really seamed to run well there. Any lower it would bog down some in the hills, faster and the turbo would start winding up, and heat would start going up.
I am hoping I can live with larger tires and the swap from the 545 to the 647 trans. If that gets me in range, I will call it good. If a gear change is needed, I think a 4.44 will be good. I think a 4,10 will be tough with a DT408.
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Old 07-16-2015, 08:22 AM   #219
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Curious...what is the difference in final ratio between the 545 and the 647?
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Old 07-16-2015, 08:32 AM   #220
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Curious...what is the difference in final ratio between the 545 and the 647?
They should both be 1:1 But the 6series is lockup converter. So the 5 series would probably run a 1-200 more rpm I'm guessing at top speed.
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