Honda J37a2 Engine Specs And Performance

If you’re looking for the detailed technical specifications and performance data for the Honda J37A2 engine, you’ve come to the right place. This article covers everything you need to know about the Honda J37A2 engine specs and performance.

Found in some of Honda’s most respected vehicles, this V6 powerplant is known for its smooth operation and robust output. We’ll break down its design, power figures, and where you can find it under the hood.

This section provides the core technical details that define the J37A2. It’s the foundation for understanding how this engine performs in the real world.

Core Technical Specifications

Let’s start with the basic numbers that every enthusiast looks for first. These specs give you a quick snapshot of the engine’s potential.

Engine Type: 60-degree V6, SOHC (Single Overhead Camshaft)
Displacement: 3.7 liters (3,664 cc)
Bore x Stroke: 89.0 mm x 98.0 mm
Compression Ratio: 11.2:1
Valvetrain: VTEC (Variable Valve Timing and Lift Electronic Control) on both intake and exhaust camshafts, 4 valves per cylinder (24 valves total)
Fuel System: Programmed Fuel Injection (PGM-FI)
Recommended Fuel: Premium unleaded (91 octane or higher) for optimal performance
Engine Block Material: Aluminum alloy
Cylinder Head Material: Aluminum alloy

Detailed Performance Output

Now for the numbers that really matter: horsepower and torque. The J37A2 is no slouch, delivering power in a characteristically smooth Honda manner.

Peak Horsepower: 300 hp @ 6,300 rpm
Peak Torque: 270 lb-ft @ 4,500 rpm
Redline: 6,800 rpm

This powerband is designed for strong mid-range pull, making everyday driving responsive. The engine feels eager without being peaky.

Key Design Features and Technology

Honda packed several advanced technologies into the J37A2 to achieve its blend of power, efficiency, and refinement. These aren’t just marketing terms; they’re real engineering solutions.

VTEC System

The J37A2 uses a sophisticated VTEC system that operates on both the intake and exhaust camshafts. This allows the engine to optimize valve timing and lift across the entire RPM range.

At lower RPMs, it prioritizes smooth idle and good fuel economy.
As you accelerate, the system transitions to a high-lift, long-duration cam profile for maximum airflow and power.
The transition is seamless, providing that classic VTEC “kick” when the engine comes alive.

Dual-Stage Intake Manifold

To further enhance its powerband, the engine employs a dual-stage intake manifold. This system uses two different intake path lengths.

At lower engine speeds, it uses a longer path for better torque.
At higher RPMs, it switches to a shorter path to maximize high-end horsepower.

This clever design helps the engine feel strong whether your merging onto a highway or just cruising around town.

Drive-by-Wire Throttle

The J37A2 uses an electronic throttle control system, often called drive-by-wire. This allows for precise control of the throttle valve by the engine computer.

It integrates with vehicle stability systems and allows for smoother throttle response tailored to different driving conditions. Some drivers prefer the feel of a direct cable, but the system is very well calibrated.

Vehicles Equipped with the J37A2 Engine

You won’t find this engine in just any Honda. It was reserved for their flagship performance and luxury models during its production run.

Acura TL SH-AWD (Type-S): (2007-2008) This is the primary application. The J37A2 gave the TL Type-S its potent performance character, sending power through a 6-speed manual or 5-speed automatic with paddle shifters to Acura’s Super Handling All-Wheel Drive system.
Acura RL: (2009-2012) In the RL luxury sedan, the J37A2 provided smooth, confident power, paired exclusively with a 5-speed automatic transmission and SH-AWD.

It’s important to note that not all Acura TL models from this era have this engine. The J37A2 was specific to the Type-S and SH-AWD performance variants, while other trims used the 3.5L J35 engine.

Real-World Performance and Driving Impressions

On paper is one thing, but how does the J37A2 actually feel from the driver’s seat? The consensus is overwhelmingly positive.

The engine is exceptionally smooth and free-revving. Power delivery is linear, with a noticeable surge as VTEC engages in the mid-range. It pulls strongly all the way to its 6,800 rpm redline.

Paired with the SH-AWD system in its primary applications, the power is put down effectively, providing excellent traction in corners and in poor weather. The engine note is refined but becomes pleasingly sporty under hard acceleration.

Reliability and Common Maintenance Points

Honda’s reputation for reliability largely extends to the J37A2. It’s a robust engine when properly maintained. However, there are a few areas that potential owners should be aware of.

Scheduled Maintenance is Key

Following the factory maintenance schedule is crucial. This engine’s performance depends on clean oil and proper timing.

Oil Changes: Use high-quality synthetic oil and change it regularly, every 5,000-7,500 miles. The engine holds about 5.7 quarts with filter.
Timing Belt: This is an interference engine, meaning if the timing belt fails, valves can collide with pistons. Replace the timing belt, water pump, and tensioner every 90,000-105,000 miles without fail.
Spark Plugs: Use the recommended iridium-tipped plugs and replace them at the interval specified in the manual, typically around 100,000 miles.

Potential Issues to Monitor

While generally reliable, a few issues have been noted by owners over the years.

Oil Consumption: Some J37 engines can develop higher oil consumption as they age, often related to piston ring wear. Regularly checking the oil level is a good habit.
Variable Cylinder Management (VCM) Note: Importantly, the J37A2 does NOT have VCM. This is a advantage, as VCM systems in other J-series engines can sometimes lead to issues like excessive oil consumption or mount vibration.
Water Pump: Always replace the water pump with the timing belt service, as its failure can lead to overheating and severe engine damage.
Motor Mounts: The hydraulic engine mounts can wear out over time, leading to increased vibration, especially at idle.

Modifications and Tuning Potential

While the J37A2 is tuned for performance from the factory, there is a community of enthusiasts who seek to extract even more from it. Gains are modest compared to forced-induction engines, but improvements can be made.

Intake and Exhaust: A cold air intake and a freer-flowing exhaust system can improve throttle response and add a slight bump in horsepower, while enhancing the engine’s sound.
ECU Tuning: Aftermarket tuning (often called “reflashing”) can optimize ignition timing, fuel maps, and VTEC engagement points. This is one of the more effective bolt-on mods for noticeable gains.
Forced Induction: Supercharger or turbocharger kits exist but are complex and expensive. They significantly increase stress on internal components, so proper supporting mods and tuning are absolutely critical.

Remember, modifying your engine can affect reliability and may have implications for emissions compliance in your area.

Comparing the J37A2 to Other Honda V6 Engines

Where does the J37A2 fit in Honda’s lineup of V6 engines? It sits at the top of the displacement range for production Honda V6s of its era.

vs. J35 (3.5L): The more common J35 makes less power (typically between 280-295 hp) but is also an excellent engine. The J37A2’s larger displacement gives it a torque advantage.
vs. J32 (3.2L): The smaller J32 was used in earlier Acura models and makes consderably less power. The J37A2 is a clear step up in performance.
vs. J30 (3.0L): The base V6 in many Hondas and Acuras, the J30 is focused more on efficiency and smoothness than outright power.

The J37A2’s unique combination of 3.7L displacement, dual-VTEC, and lack of VCM makes it a special unit for enthusiasts.

FAQ Section

What cars have the J37A2 engine?

The Honda J37A2 engine was used specifically in the 2007-2008 Acura TL Type-S with SH-AWD and the 2009-2012 Acura RL. It’s important to verify the engine code, as not all TL or RL models from those years have it.

Is the Honda J37 a good engine?

Yes, the J37 series, including the A2 variant, is widely regarded as a very good engine. It’s powerful, smooth, and inherits Honda’s strong reputation for reliability when properly maintained. The absence of VCM in the A2 version is seen as a plus by many.

How much horsepower does a J37A2 have?

The Honda J37A2 engine produces 300 horsepower at 6,300 RPM. This was a significant figure for a naturally aspirated V6 in the mid-2000s.

What is the difference between J37A1 and J37A2?

The J37A1 was used in the Acura MDX SUV. While similar, key differences include adaptations for an SUV application, such as a different intake manifold and tuning. The J37A2 in the TL Type-S and RL is tuned for a higher performance peak and is paired with rear-biased SH-AWD systems.

Is the J37 an interference engine?

Yes, the J37A2 is an interference engine. This means if the timing belt breaks, the pistons and valves can collide, causing extensive and expensive damage. Adhering to the strict timing belt replacement interval is non-negotiable.

What oil does a J37A2 take?

Honda/Acura recommends using premium-grade 0W-20 or 5W-20 synthetic motor oil for the J37A2 engine, depending on climate. Always check your owner’s manual for the specific recommendation for your vehicle and driving conditions. The engine holds approximately 5.7 quarts during an oil change with filter replacement.

The Honda J37A2 engine remains a highlight of Honda’s engineering prowess from the 2000s. It delivers a fantastic blend of silky-smooth operation, strong naturaly aspirated power, and proven durability. For owners of the Acura TL Type-S or RL that came with this motor, you have a piece of Honda’s performance heritage under the hood. Treat it to regular maintenance, adress any minor issues promptly, and it should provide many miles of driving pleasure.