WOD Race Radiator 38" x 17" x 3" - Dual 16" SPAL Fans & Shroud
CU-27714-05
The WOD 38" x 17" Race Radiator is a severe-duty cooling package built for high-horsepower off-road vehicles that cannot afford cooling problems. Proven by Wide Open Design for more than 15 years in Ultra4 race cars, competitive rock bouncers, Rocketship and Revolution chassis builds, and custom tube chassis applications, this TIG-welded aluminum radiator provides the core size and airflow support required for extreme operating conditions.
Designed for big block, small block, LS, LT, and other high-output engine combinations, this package combines a 38" x 17" x 3" aluminum radiator with dual 16" SPAL puller fans rated at a combined 3,836 CFM. It is built for low-speed crawling, extended hill climbs, restricted chassis airflow, high ambient temperatures, and repeated wide-open-throttle use where smaller universal cooling packages may not provide enough capacity.
Includes:
- (1) WOD 38" x 17" x 3" TIG-Welded Aluminum Race Radiator
- (2) 16" SPAL Electric Puller Fans
- (1) Mounted Aluminum Fan Shroud
- (1) Straight -16 AN Upper Radiator Fitting
- (1) Straight -16 AN Lower Radiator Fitting
- (1) Petcock Drain Valve
Note: This is a large universal cooling package intended for custom fabrication. Verify radiator dimensions, fan depth, hose routing, fill-cap access, and chassis clearance before ordering.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Wide Open Design |
| WOD Part Number | CU-27714-05 |
| Product Type | Severe-Duty Off-Road Race Radiator Package |
| Radiator Dimensions | 38" Wide x 17" High x 3" Thick |
| Radiator Material | Aluminum |
| Radiator Construction | TIG-Welded |
| Core Style | High-Efficiency Cooling Core |
| Fan Quantity | 2 |
| Fan Brand | SPAL |
| Fan Part Number | VA18-AP70/LL-86A / 30102120 |
| Fan Diameter | 16" |
| Fan Overall Diameter | 15.75" |
| Fan Depth | 3.45" / 88 mm |
| Fan Configuration | Puller |
| Blade Style | Straight Blade |
| Fan Voltage | 12V |
| Airflow Per Fan | 1,918 CFM |
| Combined Rated Airflow | 3,836 CFM |
| Amp Draw Per Fan | 17.4–19.5 Amps |
| Upper Fitting | Straight -16 AN, Passenger Side |
| Lower Fitting | Straight -16 AN, Driver Side |
| Fill Cap Location | Passenger Side |
| Drain | Petcock Drain Valve Included |
| Shroud | Mounted Fan Shroud Included |
| Intended Use | Severe-Duty Off-Road, Racing, Rock Bouncing, Ultra4, and Custom Chassis Applications |
Fan airflow figures are rated values. Actual cooling performance depends on radiator restriction, shroud design, system pressure, coolant flow, engine load, airflow path, and installation quality.
Fitment
Universal Custom-Fabrication Fitment
Common Vehicle Applications:
- Wide Open Design Rocketship Rockbouncer chassis
- Wide Open Design Revolution chassis
- Ultra4 race cars
- Competitive rock bouncers
- Rock crawlers
- Custom tube chassis buggies
- High-horsepower trail rigs
- Severe-duty off-road race vehicles
Common Engine Applications:
- GM LS engine combinations
- GM LT engine combinations
- Small Block Chevrolet engines
- Big Block Chevrolet engines
- Other high-output custom engine combinations
Fitment Notes:
- Builder measurement is required before ordering.
- Verify the full 38" x 17" x 3" radiator dimensions against the available chassis space.
- Allow additional clearance for the fan shroud, 3.45" fan depth, wiring, fittings, and hose bends.
- Upper outlet is located on the passenger side.
- Lower outlet is located on the driver side.
- Both radiator connections use straight -16 AN fittings.
- Verify fill-cap access after the radiator is mounted.
- Custom mounting brackets, coolant plumbing, wiring, relays, fuses, and controls may be required.
- Support the radiator securely while isolating it from excessive chassis flex and vibration.
- Confirm adequate air intake and hot-air exit paths around the radiator.
FAQ
Who is this radiator package designed for?
This package is intended for high-horsepower off-road vehicles that generate substantial heat during low-speed crawling, extended hill climbs, racing, repeated throttle use, and severe-duty operation. It is best suited to custom chassis builds with enough space to support a large radiator and dual-fan package.
Why use such a large radiator?
A larger core provides more cooling surface area and greater coolant capacity. In high-load off-road applications, that additional capacity helps the cooling system absorb and reject heat when vehicle speed is low and natural airflow through the chassis is limited.
Why are dual puller fans used?
Puller fans mounted behind the radiator draw air through the core. The dual 16" SPAL fans provide strong airflow support across a broad section of the radiator when vehicle speed alone cannot move enough air through the cooling package.
Does 3,836 CFM guarantee that the engine will stay cool?
No. Fan airflow is only one part of the system. Cooling performance also depends on radiator size, shroud coverage, coolant flow, thermostat operation, system pressure, hose routing, water-pump speed, engine tune, airflow entry, and the ability to discharge hot air from the chassis.
Why is a full fan shroud important?
A properly fitted shroud helps the fans pull air through a larger portion of the radiator core instead of only through the area directly in front of the fan blades. Better core coverage improves low-speed cooling efficiency and reduces dead-air areas.
What electrical system is required for the fans?
Each fan draws approximately 17.4–19.5 amps, so the combined running load can approach 39 amps. The fans should be wired with correctly sized relays, fuses, wiring, grounds, and charging-system capacity. Startup current may be higher than the stated running draw.
Can both fans run from one relay?
The electrical system should be sized for the combined current demand and startup load. In many custom installations, each fan is placed on its own appropriately rated relay and fuse so one circuit failure does not disable both fans.
Are -16 AN coolant lines large enough?
This radiator is configured with -16 AN upper and lower connections because that plumbing size is commonly used in WOD race and custom chassis cooling systems. The complete cooling system must still be designed around the engine, water pump, hose length, routing, restrictions, and intended operating conditions.
Where should the radiator be mounted?
The radiator should be positioned where it receives a reliable supply of cool air and has a clear path for hot air to exit. Rear-mounted radiators often require carefully designed ducting, body vents, fan controls, and hose routing to prevent heat recirculation and trapped air.
How should the radiator be mounted in a tube chassis?
The radiator should be securely supported while allowing some isolation from chassis twist and vibration. Hard-mounting a large aluminum radiator into a flexing chassis can place unnecessary stress on the tanks, welds, fittings, and core.
What should be checked before ordering?
Measure the available width, height, radiator thickness, fan depth, hose clearance, fill-cap access, mounting structure, and airflow path. Also confirm that the vehicle's electrical and coolant systems can support the dual-fan package and -16 AN plumbing configuration.
