Jagg Oil Coolers for Harley-Davidson Motorcycles
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Frequently Asked Questions

How does the performance and flow of a Jagg Oil Cooler compare to the competition?

Jagg Oil Coolers, with Hyper-Flow Technology, consistently perform better than the competition. There is no other oil cooler in the world that can approach our heat rejection while maintaining our high flow/low pressure-drop. Conversely, if our flow is approached it is at the expense of lowering heat rejection ability. See The Jagg Advantage.

Why does my Offset Oil Filter Adapter loosen when I remove my oil filter?

An oil filter can tighten against its sealing surface due to thermal expansion of the o-ring during the normal heat cycle. If care is not taken to hold the oil filter adapter in place during oil filter removal, then removal of an oil filter that has been affected by this process can cause the offset oil filter adapter to rotate and loosen, requiring the removal and refitting of the oil filter adapter.

Jagg has developed a mechanical stop, the part # 4600AR-C Anti-Rotation Device, sold separately, to eliminate this inconvenience.

Do the fins on a Deluxe cooler offer a cooling advantage?

No. The original Deluxe Jagg Oil Cooler was designed to compliment the cylinder fins on a blacked-out motor with brushed cylinder fins. Jagg was the first to recognize a market demand for a functional and stylish oil cooler.

Do I need an oil cooler?

Only if your motorcycle gets hot.

What is the difference between the 4600 and 4700?

Aside from the obvious physical difference, the 4700 incorporates a built-in automatic, thermostatic by-pass.

Do I need a thermostat?

If you wish for your oil to by-pass the oil cooler until engine oil temperatures reach circa 190ºF, then choose a thermostat.

How does the 4000 work?

When the arrows of the by-pass knob are dialed toward the oil cooler, the oil has no choice but to travel to the cooler and return to the system. When the arrows on the by-pass knob are directed across the body of the by-pass, the oil will follow the immutable laws of physics and choose the path of least resistance...returning to the system.

How much can I expect your oil cooler to lower my temperature?

There are many variables associated with a specific answer to this question. While we possess the computational fluid dynamics programs and in-house oil-cooler-testing facilities to provide specific output, given specific input parameters, we prefer to state that our coolers are designed to bring your oil to within a standard operating range.

Why is Jagg better?

Jagg Oil Coolers are legitimate oil radiators offering greater surface area, flow dynamics, and durability than the competition. See What sets Jagg apart from the competition.

Why do I need an oil filter adapter?

Oil filter adapters provide an easy way to access the motorcycle's oil supply for the installation of an oil cooler. Jagg oil filter adapters direct oil through the filter first and then to the cooler. This is especially important on the pressure side of the engine. This allows the warmer, thinner oil to flow easily across the oil filter, and then on to the oil cooler, then sending clean, cool oil to the engine with the least amount of restriction.

All of Jagg's oil filter adapters employ HyperFlow Technology for a higher-flowing, higher-performing setup.

Will the 4600/4700 offset oil filter adapter fit my EVO?


How much torque do I need to place on the cinch nut of the oil filter adapter?

Since you are compressing a rubber o-ring when you tighten the oil filter adapter to the oil filter housing, it is not necessary to specify a torque value; however, we have determined this value at circa 144in-lbs or 12ft-lbs or 16.2Nm.

Be sure to thoroughly clean the filter mounting surface of oil (read: do not apply oil to this o-ring!) prior to tightening the lock nut to ensure that the adapter will remain stationary while tightening the cinch nut.

Which direction does oil flow in these oil coolers?

There is no "In" or "Out" on Jagg oil coolers. Whichever port the oil enters, it exits the other one.

Which port does oil come from in the oil filter adapter?

Refer to the instructions specific to the oil filter adapter part number.

Does the 10-row cooler cool better than the 6-row?

Heat exchange principles dictate that greater surface area will result in greater cooling potential.

Does the low mount cool as well as the vertical mount?

Heat exchange principles dictate that in an air-cooled heat exchanger greater airflow will result in greater heat exchange. While there is greater air-flow available to the vertical-mount coolers, the low-mount coolers have been designed to exceed the performance demands of most applications.

How does the 10-row vertical "inline" get air through it?

With the air rushing by the oil cooler in an area of relatively high pressure, a unique air foil simultaneously creates a low pressure area behind the air foil and draws air through the cooler from its backside. The greater the speed of the air passing the foil, the greater the volume of cooling air drawn through the cooler.

Will your cooler decrease my oil pressure?

Jagg Oil Coolers are engineered to strike the perfect balance between performance and flow. Square-inch to square-inch, there is no oil cooler that offers the combination of performance and low-pressure drop that a Jagg Oil Cooler offers.

The Jagg Oil Cooler philosophy is a "systems" approach. While Jagg components individually offer less flow restriction than the competition, the significant object is the balance of performance and flow within the entire system.

Why is one of the ports on my oil cooler white while the other one is black?

After the brazing process, Jagg oil coolers are fine-media blasted to ensure a uniform primary finish. To prevent entry of the media-blast material, the ports are plugged. During the powdercoating process, handlers will remove at least one of the plugs to ensure that pressure differential throughout the curing process will not cause a plug to blow out, bounce around, and stick to the gel-like powder. This would ruin the finish.

Before consumer packaging, the final plug is removed, revealing the original, raw-aluminum finish.

At what temperature does the automatic thermostatic by-pass operate?

The actuator begins to move at 185ºF. By 195ºF it is fully-actuated, plugging the by-pass hole, and directing 100 percent of the oil's flow to the oil cooler.

How does the automatic thermostatic by-pass work?

Jagg Oil Filter Adapters flow oil through the filter before the oil flows through the oil cooler. This is an original and revolutionary design pioneered by Jagg. Jagg Oil Filter Adapters are the only adapters to adopt this advantageous philosophy. The Jagg Oil Filter Adapter with Automatic Thermostatic By-Pass is a sophisticated component.

After oil travels through the oil filter, the by-pass hole allows oil to take the path of least resistance, returning to the system without traveling to the oil cooler until the actuator is fully stroked, plugging the by-pass hole.

Do you offer a warranty on your products?

Jagg has never published a warranty; however, Jagg stands behind its products and desires satisfied customers. Jagg manufactures the highest quality, highest performing oil coolers on the market. If you are dissatisfied with Jagg products, a Jagg representative stands ready to amicably resolve your dissatisfaction.

Do you make oil coolers as private-label brands for other manufacturers?

No. Jagg is the most prominent aftermarket oil cooler brand, and it is the only brand that we produce.

What should my oil pressure be?

It is recommended that you consult your specific motorcycle manufacturer's service manual.

How much oil capacity does your cooler add to my bike?

A 6-row oil cooler will add approximately 6oz. A 10-row oil cooler will add approximately 8oz.

Does my oil need to reach 212° to burn off the water?

No. Water prefers to separate from oil at ambient temperature. When the water/water vapor in your oil system encounters any hot engine component, the separation process is accelerated.

What is the life of the automatic thermostat?

Estimated to be greater than 10,000 cycles.

1 cycle = each time the actuator has actuated and contracted.

Can I purchase a Jagg oil cooler without purchasing an entire kit or system?

Yes. See Jagg Universal Oil Coolers. These oil coolers are sold separately for the odd custom project, for adding an additional oil cooler to an oiling system, for replacing an existing Jagg oil cooler, and generally for the applications that haven't been developed.

Will the addition of- or the upgrade to- a Jagg oil cooler kit void my vehicle manufacturer's warranty?

This is one of the most-asked questions among all aftermarket product manufacturing queries.

From the Federal Trade Commission:

  • "No. An 'aftermarket' part is a part made by a company other than the vehicle manufacturer or the original equipment manufacturer. A 'recycled' part is a part that was made for and installed in a new vehicle by the manufacturer or the original equipment manufacturer, and later removed from the vehicle and made available for resale or reuse. Simply using an aftermarket or recycled part does not void your warranty. The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket or recycled part. Still, if it turns out that the aftermarket or recycled part was itself defective or wasn't installed correctly, and it causes damage to another part that is covered under the warranty, the manufacturer or dealer has the right to deny coverage for that part and charge you for any repairs. The FTC says the manufacturer or dealer must show that the aftermarket or recycled part caused the need for repairs before denying warranty coverage."

    Source: http://www.ftc.gov/bcp/edu/pubs/consumer/alerts/alt192.shtm
    Accessed: 8/30/2012

For more information on the Magnuson-Moss Act and how it affects you, check out: