MHX-514 High-Efficiency Oil Cooler

Out of stock
SKU: MHX-514
Regular price $349.00



REPLACED BY THE MHX-515 - Click to view the new cooler.




Improved Racing's Motorsport Heat Exchanger (MHX) series oil coolers are the result of several years of development and testing to create a highly efficient oil cooler. These coolers were perfected through extensive testing on our in-house heat exchanger test system and wind tunnel.

Design update: We have tweaked our cooler core designs by slightly increasing row density. This has resulted in adding one additional row for this cooler, providing a slight increase in performance while maintaining similar overall dimensions.

The MHX-514 oil cooler is a dual-pass oil cooler that matches heat rejection rates to larger, heavier stacked-plate coolers made by brands such as Setrab, Mocal, and Earl's. Compared to a typical 25-row stacked plate cooler, this cooler is 17% smaller overall and 20% lighter, yet holds 36% more oil volume capacity. The core is 23% thinner and has a lower row and fin density, allowing more air to flow through the cooler to other heat exchangers (such as a radiator) behind it.

A major design focus was to minimize welds and brazings to make these coolers stronger, lighter, and less prone to leaks. All four end caps are single-piece CNC-machined billet aluminum. The rows consist of laser-welded, thin-gauge aluminum tubes stuffed with turbulators to maximize heat transfer while minimizing weight.  The dual-pass design also maximizes heat transfer efficiency.

There are four M8x1.25 mm mounting holes, one on each corner of the cooler. Improved Racing has designed lightweight aluminum brackets (sold separately) to make mounting your cooler as easy as possible. The brackets feature integrated rubber isolators that protect the cooler from excessive vibration and extend the life of the cooler.

The MHX 500-series coolers feature -10AN female O-ring boss ports on the same side of the end tank for convenient line routing. Optional fittings are available in -6AN, -8AN, -10AN, and -12AN JIC male flare threads.

All Improved Racing oil coolers are pressure tested to 175 PSI to ensure no leaks and are rated for continuous operation at 150 PSI. Our coolers are made in the USA and backed by our Lifetime Warranty.

CNC-machined billet aluminum tank end caps with machined mounting holes on all four corners

3/8" or 1/2'' hose barb fittings or AN fittings in -06AN, -08AN, -10AN, or -12AN are available with the purchase of a cooler

Vibration isolating mounting brackets available (sold separately)

Features and Benefits

  • Compact, lightweight design is 17% smaller, 20% lighter, and has 36% more oil capacity than a 25-row stacked plate oil cooler
  • Similar heat rejection rates to larger 25-row stacked plate oil coolers
  • Dual-pass design
  • Higher pass-through airflow rate than stacked plate coolers
  • Female O-ring boss -10AN ports on same side of end tank
  • 4x flanged M8 mounting screws are included
  • Lifetime Warranty
  • Made in the USA

Dimensions and Specifications


Part # Rows HP Range


(Total Height)


(Port Spacing)


(Port Offset)

Passes Fittings / Ports Weight Capacity Mounting Holes
MHX-514 15 300-410 HP 7.12 in (180.8 mm) 4.6 in (116.8 mm) 1.17 in (29.6 mm) 2 -10AN O-ring Boss 2.98 lb (1.35 kg) 0.75 Qt (0.71 L) M8 x 1.25
MHX-520 20 400-500 HP 9.73 in (247.1 mm) 7.40 in (188.0 mm) 1.17 in (29.6 mm) 2 -10AN O-ring Boss 3.8 lb (1.7 kg) 1.04 Qt (0.98 L) M8 x 1.25
MHX-530 30 600+ HP 14.30 in (363.2 mm) 11.5 in (292.1 mm) 1.40 (35.6 mm) 2 -10AN O-ring Boss 5.64 lb (2.45 kg) 1.56 Qt (1.48 L) M8 x 1.25


Part #
Improved Racing
Part Weight
2.98 lb (1.35 kg)
Primary Material
Construction Type
Flat stuffed tube and fin
Number of Passes
Core Width
9.0" (228mm)
Core Height
6.94'' (176 mm)
Core Thickness
1.55" (39.4 mm)
Fitting Size
-10AN Female O-Ring Port
Test Pressure
175 psi (12.07 bar)
Maximum Operating Pressure
250 psi (17.24 bar)
Maximum Operating Temperature
302°F (150°C)
Minimum Operating Temperature
-40°F (-40°C)
Fluid Compatibility
Engine oil
Gear oil
Power Steering Fluid
Transmission fluid
Fluid Capacity
0.75 Qt (0.71 L)
Mounting Hole Size
M8 x 1.25


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