Diesel cooling options and ideas

[@californiajeeping]

Wonder when the 24" Wrangler grills will be available to order and if they'll be a direct fit. It's grown on me and the added airflow will be welcomed.

I am interested in this. I’d like to see what this grill and an upgraded radiator and thermostat could do. A 180 degree thermostat with a larger radiator may keep the oil from ever going nuclear in the first place. Hard for oil to be above 200 if everything it touches is at 180…

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[RudeJeepin]

I am interested in this. I’d like to see what this grill and an upgraded radiator and thermostat could do. A 180 degree thermostat with a larger radiator may keep the oil from ever going nuclear in the first place. Hard for oil to be above 200 if everything it touches is at 180…

For arguments sake, let's say you could keep the engine at 180 degrees, I don't think the motor would run properly. With out some kind of retune, I doubt the programming would even come out of the enrichment circuit. Modern diesels are designed to run hotter.

I'd be interested in the new grill for more air flow. But honestly I haven't had an issue with overheating or derating yet.

 

[azaustin]

Attached is a picture of my Off Road Pages taken today on one of the killer hills between Ash Fork and Williams, AZ on I-40. I was running 50-55mph and shifting down manually one extra gear from the gear it was in if left in drive. OAT was 73 degrees as shown on the display. You can also see the altitude. I wish it would display the rpm as well. Probably around 3200-3500 rpm if I recall correctly. Traffic was heavy, so my partner took the picture. I will try to do a little better job of documenting this kind of shot on our trip in June. We were pulling our 2020 Rockwell 2104S, which is supposed to weigh under 5k empty. I’m guessing we were around 5500lbs, with a moderate load in the bed of the truck and cab, and about half a tank of fuel, 305 pounds of people and a 14 lb Chihuahua. I promised I’d post some display pictures, so here is the first one. I could have driven faster but was trying to keep the oil temperature under 270. Loads and weights are estimates only.

 

[azaustin]

Looks like the picture may not have made the post. Here it is again.

 

[CrazyCooter]

Looks like the picture may not have made the post. Here it is again.

You were about to be denied......2° more oil temp.

 

[@californiajeeping]

For arguments sake, let's say you could keep the engine at 180 degrees, I don't think the motor would run properly. With out some kind of retune, I doubt the programming would even come out of the enrichment circuit. Modern diesels are designed to run hotter.

I'd be interested in the new grill for more air flow. But honestly I haven't had an issue with overheating or derating yet.

GDE offered a low temp thermostat and tune with their ram 1500 ecodiesel tubes in the past. I’m sure it helped immensely.

 

[GoFastJTR]

I finally got to test my S&B Rubicon hood scoops in hot weather and I think they work! I think they lower oil temp by 10 degrees.

I was driving to La Vegas in 90 degree weather with AC on full blast. There’s a stretch of highway where you drive uphill for like 10 miles straight. I was driving 75-80mph uphill the whole time and couldn’t get my oil temp to go above 250. Last year when I drove this section of road in the same weather without hood scoops, my oil temp got up to 260’s.

I think they help cool down the whole engine compartment. They blow air right over the exhaust pipes.

 

[Sweetums]

I've had my diesel about a month and we are coming into the hot months, I'm interested in preventive measures to keep it cool and healthy. There's a ton of information and debate in this thread; is there a consensus of what combination of solutions will actually work best? As a new owner, there's a lot to comb through - it's interesting to see the process and debate unfold, but it would be nice if there was a post or thread with a "current best practices" to follow to get a working cooling formula.

I had thought about opening up the stock hood vents to exhaust hot air from the engine bay, but it will involve cutting into the under-hood liner and allow water and debris into the engine bay (I unfortunately have to park outdoors). I've always thought hood scoops were counterproductive by putting cold air behind the radiator and making it more difficult to draw cool air through. The convention on the XJ I used to own was to shim the back of the hood or cut hood vents to let hot air out and draw cold air through the radiator. Earlier in the thread it seemed that hood scoops were working to reduce temperatures, so maybe my old logic is wrong. Hood scoops would at least keep rain and leaves out when parked.

I'm also hoping the more open 2024 grille will fit my 2021 and would consider swapping if it means a happier engine.

 

[Rusty PW]

I've had my diesel about a month and we are coming into the hot months, I'm interested in preventive measures to keep it cool and healthy. There's a ton of information and debate in this thread; is there a consensus of what combination of solutions will actually work best? As a new owner, there's a lot to comb through - it's interesting to see the process and debate unfold, but it would be nice if there was a post or thread with a "current best practices" to follow to get a working cooling formula.

I had thought about opening up the stock hood vents to exhaust hot air from the engine bay, but it will involve cutting into the under-hood liner and allow water and debris into the engine bay (I unfortunately have to park outdoors). I've always thought hood scoops were counterproductive by putting cold air behind the radiator and making it more difficult to draw cool air through. The convention on the XJ I used to own was to shim the back of the hood or cut hood vents to let hot air out and draw cold air through the radiator. Earlier in the thread it seemed that hood scoops were working to reduce temperatures, so maybe my old logic is wrong. Hood scoops would at least keep rain and leaves out when parked.

I'm also hoping the more open 2024 grille will fit my 2021 and would consider swapping if it means a happier engine.

I opened up the hood vents on my Rubi. It didn't make a difference going down the highway. On the trail. I could see some heat coming up at times.

 

[@californiajeeping]

I opened up the hood vents on my Rubi. It didn't make a difference going down the highway. On the trail. I could see some heat coming up at times.

I haven’t hit 250+ since I removed all of the foam cowl pieces and added my poison spyder hood vent.

when the fan kicks on at a light hot air blows out of every gap And slot.

 

[jc99]

@californiajeeping did you remove the rubber insulators on top where my finger is resting on?

 

[@californiajeeping]

Yes remove those and the engine cover and the one on the injector pump. The seal at the back of the hood and foam corner pieces. All of it helps to let air out but you will hear the diesel engine more.

 

[Rusty PW]

Yes remove those and the engine cover and the one on the injector pump. The seal at the back of the hood and foam corner pieces. All of it helps to let air out but you will hear the diesel engine more.

That's all gone. I removed it when I installed my Banks Derringer.

 

[jc99]

@californiajeeping was the injector pump insulation easy to remove? do you take the front cover and the insulation off or just the insulation and put the cover back on?

 

[@californiajeeping]

@californiajeeping was the injector pump insulation easy to remove? do you take the front cover and the insulation off or just the insulation and put the cover back on?

Took the covers and insulation off.

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