Cummins 8.9 ISL 400/1200. What do you guys consider to hot for coolant temps.

BaBaBouy said:
This rig always ran cool on my trips into town to pick up some fish sticks, what’s all the hubbub!
I like the muffler, I was going to put an angled exhaust pipe to help steer the exhaust up and back to keep the dust down at low speed on dirt in campgrounds, the dust is right in front of the radiator
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I was thinking about trying to make some sort of shield to stop the fan from kicking dirt up.
 
No wonder this thing makes its own haboob going down a dirt road. Holy crap what were they thinking. Those fan blades hang out of the shroud inch and a half.
 

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I just got back from St Anthony.

I have a '11 43' American Coach Tag towing a heavy stacker. In the hotter 100+ degree times of the drive trip I would get around 220 on the large grades. If I really watched the RPM's I could stay around 215-217. Normal flat was around 190-200, down hill around 180. It would cool quickly after reaching peak once we hit the downhill. Overall coach ran great, always sluggish down to 35 mph on the steep grades, thought about a tuner many times but it ain't worth it to me, keep it stock. Plus the Allison 3000 is only good to 500hp but as far as torque, it's only rated for the 1250 ft/lb that it already has.

Towing my Jeep is a different story as far as grade speeds and temps. Again the stacker is a beast (I did beef up the 15K hitch when I bought it 4 years ago).
 
See how this does
 

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I have the same engine with the side draft and a dash warning light will come on at 225.
I have hit 225 a couple times but it's always 110+ towing. I'm not racing anybody, I just slow it down and drop a gear.
 
onanysunday said:
No wonder this thing makes its own haboob going down a dirt road. Holy crap what were they thinking. Those fan blades hang out of the shroud inch and a half.
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That actually is normal all the way in it will not cool hardly at all
 
GBR said:
That actually is normal all the way in it will not cool hardly at all
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So now you have me wondering if that little flat deflector piece I put on the bottom could affect cooling or air flow. I don't see how it could but......
 
onanysunday said:
So now you have me wondering if that little flat deflector piece I put on the bottom could affect cooling or air flow. I don't see how it could but......
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It will change the airflow for sure. Airflow from a fan is flung outwards. You’re now asking it to go straight back.

Whether this will affect cooling or not, TBD. Probably want to bring tools to remove it if you see issues.
 
Rockwood said:
It will change the airflow for sure. Airflow from a fan is flung outwards. You’re now asking it to go straight back.

Whether this will affect cooling or not, TBD. Probably want to bring tools to remove it if you see issues.
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I put in eight nut certs with a small bolt in each one. I can have it off in one minute. If you look at a circle it's going to affect only a very small portion. We will see.
 
onanysunday said:
So now you have me wondering if that little flat deflector piece I put on the bottom could affect cooling or air flow. I don't see how it could but......
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I don’t know if that should make that much difference but it will change air flow some
 
I would defiantly take that vertical "up/brake" piece off at the end.

Do a 45*~ DOWN after the rivnuts.
 
Kraut_n_Rice said:
I would defiantly take that vertical "up/brake" piece off at the end.

Do a 45*~ DOWN after the rivnuts.
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I put that bend in there just to give the piece some strength. It is only aluminum. That bend is quite a ways out from the fan.
 
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