Cooling fan

[TheGeneral]

Long time since I posted on here, hope everyone is still going good.
I have a 2 row ally rad on my charger with a 16" electric fan, adjustable thermostat but no shroud.
Temperature is fine, less than 90 degrees C all the time, but after a blast and them sitting in traffic the temp will creep up to 95+ with the fan running. this never really seems to come down, so would I be better fitting a shroud with the elecy fan? Would this reduce normal cooling when the fan isn't kicking in or should I go back to a full mechanical set up. Motor is a 440. It hasn't boiled up but it does seem to be really hot. Thermostat seems to work fine and was replaced a few years ago. Cooling system was flushed and new coolant in. Any advice appreciated.

[mygasser]

what's the cfm capacity of the fan? they're not all created equal and some types just don't move enough air.
neil.

[Pete]

Shrouds are always a good idea.

I am personally not keen on electric only fans on the street.

It is always worth checking your ignition timing too, as this can contribute to excess temperatures.

[TheGeneral]

Hi, thanks for the replies. Timing etc is all spot on - has a restrictor plate in the dizzy etc and runs great, set up on a 4 gas... Is 95 degrees C too high, am I expecting too much? It has had an electric fan on for years, but this is a replacement so perhaps not as efficient as the previous one.
I have only 3 inches between the rad and the front pulley... so If I made a shroud, things would be tight...so is the thing to put a flex fan on (and lose fingers )???
Just checked the listing for the fan... says 120W 2500 CFM, which is way more than any other 120W fan, like 30% more!! so guessing this is bogus or they got cubic meters per hour mixed up with CFM. So thinking I may need a shroud and a better fan.

[sublimemike]

If you decide you need a shroud I have an ally one for a 26 ich rad. It's in the parts for sale listing.

Mike

[rocket70]

Have you tried giving the fins on the radiator a clean. A blast through with a jet wash to clear any bugs, dust etc out?

[Blue]

https://www.moparuk.com/forums/viewtopic.php?t=47233

Aftermarket electric fans even at 2500cfm do not move enough air. . Clutch fan and a shroud are all you need, fit and forget though the vast majority want to fit an electric fan. OEM electric fans with a bigger alternator is the only thing that totally works, lot of money and a lot of hassle and for what? 10hp at most, just not worth it IMO.

[mygasser]

Have you tried giving the fins on the radiator a clean. A blast through with a jet wash to clear any bugs, dust etc out?

agreed, but remove the rad and jet wash from the back side so any bugs come out the way they went in. if you blast from the front they can get bedded deeper into the core. we had to do this regularly on the rad's for my dad's fridge lorries that had a small engine on the refrigeration unit. they were always getting clogged with bugs.
neil.

[mygasser]

https://www.moparuk.com/forums/viewtopic.php?t=47233

Aftermarket electric fans even at 2500cfm do not move enough air. . Clutch fan and a shroud are all you need, fit and forget though the vast majority want to fit an electric fan. OEM electric fans with a bigger alternator is the only thing that totally works, lot of money and a lot of hassle and for what? 10hp at most, just not worth it IMO.

where's the 'agree' button on here, lol?
neil.

[Dave999]

if it gets hot when sitting in traffic after a good blast that is to be expected... you put a lot of heat into the head during the blast and then slowed down to idle speed.. the pump ain't pumping much and little natural flow through the radiator

if it doesn't come down when you start moving again at say 30-40 mph then is your fan just blocking and disrupting what would normally be a higher rate of natural flow.

can you switch it off after going for a blast and letting it heat up at idle, and then run it at 30-40 mph without the fan spinning and see if it cools down. that might indicate if the spinning blades of the fan are causing a disruption to natural airflow at a speed when i would expect normal fixed 4/5 blade Fan action to be meaningless and natural flow to be doing 99% of the cooling.

Dave




.

[TheGeneral]

Hi, thanks for all the thoughts on this.
Supplier of the elecy fan sent me another in case it wasn't getting up speed, it was exactly the same, so I spotted a 6 blade flex fan on my misses 66 Mustang, so 4 x 5/16 UNC bolts and a few sliced fingers and it was on my Charger lol.
What a difference - runs at 75 degrees C normal cruising, gave it a blast then left it ticking over for 20 mins where it stayed under 80 degrees, whereas it was up at 95+ with the elecy fan on. Not sure I will be needing the shroud. Now I have to find one to go back on the Mustang... but no rush as that still wants painting.
Cheers for the help.

[Blue]

You mostly need the shroud to save your fingers…

[mygasser]

You mostly need the shroud to save your fingers…

yep, they're proper sharp for sure. amongst other bits i got one at the nsra swap meet a few years back. it was cold and snowing and my mate was holding it for me. when we got to the car it had cut all 4 fingers on his hand but he didn't know because it was so cold.
neil.

[Blue]

Those aluminium and stainless flex fans are lethal, had more than my fair share of injuries from those.

[Blue]

The long discontinued Mopar performance viscous fan kit has long been my weapon of choice, great cooling without much HP draw. It is possible to replicate using parts from Hayden https://www.haydenauto.com/media/5587/i ... -pages.pdf