Oil coolers
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Road Master
Joined: Dec 2006
Posts: 786
Likes: 9
From: Oceanside, California
Oil coolers
I was curious if an oil cooler lowers temps that much?
If so what is a good brand that would fit my 98 ultra?
How much extra oil does it hold or does that depend on the brand?
If so what is a good brand that would fit my 98 ultra?
How much extra oil does it hold or does that depend on the brand?
Club Member
Joined: Aug 2008
Posts: 22,861
Likes: 17,918
From: Lafayette, Louisiana
Oil coolers are only effective when you are moving, but if you are moving, you don't need them, especially on Evo. The exception to its effectiveness is if you get one that has a fan.
Jagg is a very good brand.
The reason I don't have one is it introduces more points of failure either in the form of potential leaks or a hose rupturing while you are riding.
There are plenty of people that will disagree with my opinion.
On an oil cooled M8, they are very necessary because oil circulates through cooling passageways in the head and around the exhaust valve in order to absorb some of the heat.
If you are having heat issues, make sure you aren't running too lean of an air fuel ratio. Free flowing air cleaner, exhaust, and retuning the carb will get you more power and lower temperatures. Some cams such as the Andrews EV13 can lower your temperature as well.
If I am stuck in a major traffic jam, I shut off for the engine and walk the bike forwards as traffic slowly advances.
Jagg is a very good brand.
The reason I don't have one is it introduces more points of failure either in the form of potential leaks or a hose rupturing while you are riding.
There are plenty of people that will disagree with my opinion.
On an oil cooled M8, they are very necessary because oil circulates through cooling passageways in the head and around the exhaust valve in order to absorb some of the heat.
If you are having heat issues, make sure you aren't running too lean of an air fuel ratio. Free flowing air cleaner, exhaust, and retuning the carb will get you more power and lower temperatures. Some cams such as the Andrews EV13 can lower your temperature as well.
If I am stuck in a major traffic jam, I shut off for the engine and walk the bike forwards as traffic slowly advances.
Cruiser
Joined: Jul 2013
Posts: 243
Likes: 6
From: Texas
Oil coolers are only effective when you are moving, but if you are moving, you don't need them, especially on Evo. The exception to its effectiveness is if you get one that has a fan.
Jagg is a very good brand.
The reason I don't have one is it introduces more points of failure either in the form of potential leaks or a hose rupturing while you are riding.
There are plenty of people that will disagree with my opinion.
On an oil cooled M8, they are very necessary because oil circulates through cooling passageways in the head and around the exhaust valve in order to absorb some of the heat.
If you are having heat issues, make sure you aren't running too lean of an air fuel ratio. Free flowing air cleaner, exhaust, and retuning the carb will get you more power and lower temperatures. Some cams such as the Andrews EV13 can lower your temperature as well.
If I am stuck in a major traffic jam, I shut off for the engine and walk the bike forwards as traffic slowly advances.
Jagg is a very good brand.
The reason I don't have one is it introduces more points of failure either in the form of potential leaks or a hose rupturing while you are riding.
There are plenty of people that will disagree with my opinion.
On an oil cooled M8, they are very necessary because oil circulates through cooling passageways in the head and around the exhaust valve in order to absorb some of the heat.
If you are having heat issues, make sure you aren't running too lean of an air fuel ratio. Free flowing air cleaner, exhaust, and retuning the carb will get you more power and lower temperatures. Some cams such as the Andrews EV13 can lower your temperature as well.
If I am stuck in a major traffic jam, I shut off for the engine and walk the bike forwards as traffic slowly advances.
If you have an evo and live in the south and you ride in the summer you need an oil cooler. 85 softail evo with the harley cooler and bra. It's been on there since 85 1/2. No leaks no problems. Just way cooler motor.
Road Captain
Joined: Aug 2012
Posts: 625
Likes: 102
From: New Albany, Ms.
Jagg is the brand I use with no problems.
If you live in a hot climate, oil cooler is a must.
Ride Safe,
Harold
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
Likes: 22,718
From: Farmington ,MS
84 Softail...live in the south...never seen the motor over 190 on a 100 degree day, according to my trustly HD tempature dipstick...properly tuned EVOs don't run hot.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,200
Likes: 3,089
From: NW AR
Jagg or Lockhart. Either get one with a built in thermostat or get the separate thermostat. I think the HD factory one was a Lockhart.
On my bike, before I put the cooler on it, I would see oil temps (sender in the bottom of the bag) sometimes of around 220-230F. After the cooler with the 180F thermostat, it never got over 180.
Now, that's with riding across Texas, across I90 in August, through Phoenix, Los Vegas, etc. If you are only riding around San Fran, you don't need one.
On my bike, before I put the cooler on it, I would see oil temps (sender in the bottom of the bag) sometimes of around 220-230F. After the cooler with the 180F thermostat, it never got over 180.
Now, that's with riding across Texas, across I90 in August, through Phoenix, Los Vegas, etc. If you are only riding around San Fran, you don't need one.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
Likes: 2,159
From: Ohio
Have a Jagg 10 row on the big block, calmed it's heat down and tune is on the rich side, it was a heat monster before the cooler. 10.2-1 compression 89" temps was fine without a cooler and heat was never a concern for years
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Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
An oil cooler can cool the engine too much, so as suggested above, get one with a thermostat. At a rough guess an oil cooler will add a mug-full or so to the system., much of it in the oil pipes to and from it. I always drained mine at oil change time, although it didn't actually hold much, compared with the oil tank.
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