Cooling options
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Cruiser
Joined: Jun 2019
Posts: 107
Likes: 50
From: TX
Cooling options
I'm about to pull the trigger on a coolflow fan from HD and a fan assisted oil cooler for my 19 SG. Wanted to know of anyone else has done these two mods and their opinion ok them.
Road Captain
Joined: Jul 2016
Posts: 504
Likes: 192
From: Atlanta
I have the cool flow fan on my 2019 SGS. Works very well and moves a lot of air. Its not intended to help cool the back cylinder when stopped, but it almost certainly has to have some positive effect. I dont have the oil cooler assisted fan.....in fact, I wanted to get it but my dealership service manager said it wasnt really necessary......cant remember the logic, but I took his advice.
Thread Starter
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Cruiser
Joined: Jun 2019
Posts: 107
Likes: 50
From: TX
I have the cool flow fan on my 2019 SGS. Works very well and moves a lot of air. Its not intended to help cool the back cylinder when stopped, but it almost certainly has to have some positive effect. I dont have the oil cooler assisted fan.....in fact, I wanted to get it but my dealership service manager said it wasnt really necessary......cant remember the logic, but I took his advice.
Road Warrior
Joined: Oct 2017
Posts: 1,883
Likes: 809
From: Ormond Beach, Florida
The H-D Coolfan works well. My right leg used to get burning hot in slower traffic. With the CF in the auto mode it takes the heat away from the rear head and off the leg. Now it is much more comfortable.
Just know, if you install it yourself you will need the optional harness shown in the installation instructions. You can see these instructions ahead of time online. Then, you will also have to have your dealer flash the ECM for it to regognise the CF.
The mounting bolts are a stif PITA to install without taking everything apart like the instructions suggest, but I managed to do it with a little perserverence and an extension on the socket.
Didn't feel a need for the oil cooler assist fan. Just needed to get the heat off the right leg.
Just know, if you install it yourself you will need the optional harness shown in the installation instructions. You can see these instructions ahead of time online. Then, you will also have to have your dealer flash the ECM for it to regognise the CF.
The mounting bolts are a stif PITA to install without taking everything apart like the instructions suggest, but I managed to do it with a little perserverence and an extension on the socket.
Didn't feel a need for the oil cooler assist fan. Just needed to get the heat off the right leg.
Road Warrior
Joined: Sep 2014
Posts: 1,271
Likes: 246
From: Columbia SC
I have the cool flow fan on my 2019 SGS. Works very well and moves a lot of air. Its not intended to help cool the back cylinder when stopped, but it almost certainly has to have some positive effect. I dont have the oil cooler assisted fan.....in fact, I wanted to get it but my dealership service manager said it wasnt really necessary......cant remember the logic, but I took his advice.
Oil temperatures are at their highest when you're cruising at fast-moving speeds as the Pistons are sprayed with oil to cool them. Of course at these speeds you already have a lot of air moving through the oil cooler.
At slow-moving speeds they are not really sprayed any longer with oil and the oil cools down. However if you're stuck in traffic the oil temperatures will rise up to and possibly passing the oil temperatures at high speeds so it's at this point where a fan might come in handy if you're stuck in traffic.
Add to that the M8 engine uses oil to cool around the valves so my opinion is having a fan is not a bad idea.
I have a Rushmore bike and the valves are not cooled by oil I did put in a 10 row Jagg oil cooler to replace the eight row OEM and use a Lenale engine fan for those few times I'm stuck in traffic or moving very slowly on a hundred degree day.
Typical oil temperatures on my Rushmore at highway speeds of over 70 miles an hour for extended periods we'll reach around 257 degrees soon as I get off the interstate it cools down on its own without the fan but again if I'm stuck in traffic it will climb back up there and more unless I turn on the engine fan. The engine fan will cook your leg though but whatever..
Since Harley makes a drop in oil cooler with fan for the M8 it's something that I would probably install in my hot climate.
Last edited by alarmdoug; Jul 27, 2019 at 08:12 PM.
Cruiser
Joined: May 2007
Posts: 167
Likes: 18
From:
I had terrible heat on my right leg. I installed the thunder max oil cooler fan about a hundred cheaper than Harley. Dealer flashed it for me when I had other work done for free. I also installed the cool flow fan with the mid frame deflection which catches the heat for the cool flow fan to catch and divert. I also decatted the headers. Now I run very comfortably. I did it all at once
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Outstanding HDF Member
Joined: Dec 2012
Posts: 2,557
Likes: 235
From: Texas
I am running Rinehart True-Duals and the rear head pipe does not come down the right side and under the bike, it bends over the trans cover and down the left side. Even when I was aware that my engine was running hot in summer traffic (temp gauge reads ~250şF), I have never had any issues with either of my legs getting hot. It can get a bit warm on my upper right thigh when I am loitering or stopped in traffic, though, but I do not have heat deflectors and those would probably alleviate that issue somewhat.
Stellar HDF Member
Joined: May 2014
Posts: 2,486
Likes: 695
From: Huntington Beach, CA
I have the fan-assisted oil cooler accessory on my 2018 Road King. It significantly cools the engine in stop-and-go traffic, which is what it is for. In my opinion it should be stock equipment.