Honda J engine

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Honda J engine
Manufacturer	Honda Motor Manufacturing
Production:	1996–
Predecessor:	Honda C engine

The J-series was Honda's second V6 engine family, introduced in 1996. It is a 60° V6 – Honda's existing C-series was a 90° engine. The J-series was designed for transverse mounting. It has a shorter bore spacing (98 mm), shorter connecting rods, and a special smaller crankshaft than the C-series for compactness. All current J-series engines are SOHC 4-valve designs with VTEC variable valve timing.

The J-series engine was designed in the United States by Honda engineers. It is built at Honda's Anna, Ohio engine plant.

One unique feature of some J-family engine models is Honda's Variable Cylinder Management (VCM) system. The system uses the i-VTEC system to turn off one bank of cylinders under light loads, turning the V6 into a straight-3. The latest Variable Cylinder Management system is able to turn off one bank of cylinders or two cylinders on opposing banks, allowing for three-cylinder use under light loads or four-cylinder use under medium loads.

[edit] J25

The J25A was the first J-series engine produced. It was only used in the export-model Inspire/Saber models, however. The J25A displaced 2.5 L and was an SOHC VTEC design. Output was 192 hp (143 kW).

• J25A
  • 1999 Honda Inspire
  • 1999 Honda Saber

[edit] J30

The J30 displaces 3.0 L and is a SOHC VTEC design. Output for the light weight 250 lb J30A1 was 200 hp (149 kW) and 195 ft·lbf (264 N·m) of torque. The J30A4 pushed output to 240 hp (179 kW) and 212 ft·lbf (287 N·m) using a three-way VTEC system, higher (10:1) compression ratio, and a novel exhaust manifold cast as one piece with the cylinder head. This version was on the Ward's 10 Best Engines list for 2003 and 2004. Honda provided an undocumented, but verified 10 hp boost when owners use 93 octane fuel, resulting in 250 hp^{[citation needed]}. The IMA hybrid version was on the list for 2005. In 2006 to mark the 30th anniversary of the Accord, Honda created the J30A5, which boosted output to 244 hp (SAE Net 08/04) and 211 ft·lbf (SAE Net 08/04) of torque. According to Honda, horsepower gains were achieved with extensive improvements to the airflow of the intake and exhaust systems.

The J30A1 used in the 6th-generation Accord (1998-2002) has heads which are very similar to the J32 engines used in Acura CL and TL Type-S engines of approximately the same years. This makes it possible to swap in J32A2 camshafts. These are readily available and not particularly expensive (about $200 for two camshafts plus $40 or so for gaskets and other items, vs. $1000+ for custom-ground camshafts from other sources) and produce excellent performance gains, particularly in the mid to high RPM range. However, the stock J30A1 valve springs are not as stiff as the J32A2 valve springs, so the valves may need adjustment more frequently than on an unmodified J30A1 engine. Also, 1998-1999 Accords used a distributor, which means the rear camshaft has to be notched by a machinist in order to work in those cars. (2000 and above J30A1s use direct ignition and thus can be dropped in unmodified.)

• J30A1
  • 1997-1999 Acura 3.0CL
  • 1998-2002 Honda Accord V6
  • 2000-2004 Honda Odyssey
• J30A4
  • 2003-2005 Honda Accord V6
• J30A5
  • 2006-2007 Honda Accord V6
• Variable Cylinder Management
  • 2005 Honda Accord Hybrid

[edit] J32

The J32 displaces 3.2 L and is a SOHC VTEC design. Bore is 89 mm (3.5 in) and stroke is 86 mm (3.4 in). Output was 225 hp (168 kW) for the J32A1, with the J32A2 raising output to 260 hp (194 kW) and 232 lb·ft (315 N·m) @ 3500-5500 rpm. A more aggressive camshaft, freer flowing intake/exhaust, and a 2-stage intake manifold all result in a 35hp increase over the J32A1. The J32A3's output in the 2004/2005 TL is 270 hp (201 kW). SAE corrected hp for the 2006-2008 TL is 258 hp (192 kW). The J32A3 also includes the one-piece exhaust manifold cast with the cylinder head, first introduced on the J30A4.

• J32A1
  • 1999-2003 Acura TL
  • 2001-2003 Acura CL
• J32A2
  • 2001-2003 Acura CL Type-S
  • 2002-2003 Acura TL Type-S
• J32A3
  • 2004+ Acura TL

[edit] J35

The J35 displaced 3.5 L (3471 cc) and is an SOHC VTEC design. Bore is 89 mm (3.5 in) and stroke is 93 mm (3.7 in). Output was 210 hp (157 kW) for the J35A1, 265 hp (198 kW) and 253 ft·lbf (343 N·m) for the J35A3, and 240 hp (178.97 kW) @ 5500 rpm and 242 ft·lbf (327.74 Nm) @ 4500 rpm for the J35A4.

The new J35 used in the Acura RL produces 290 hp (224 kW) at 6200 rpm and 256 ft·lbf (347 N·m) at 5000 rpm. This engine was on the Ward's 10 Best Engines list for 2005 and 2008.

The J35A9 used in the Honda Ridgeline produces 247 hp (184 kW) at 5750 rpm and 245 ft·lbf (332 N·m) at 4500 rpm.

The J35 was also used by General Motors in the 2004-2007 Saturn Vue, though GM refers to it as the L66.

• J35A1
  • 1999-2001 Honda Odyssey
• J35A3
  • Acura MDX
  • 2005-2008 Acura RL
• J35A4
  • 2002-2004 [[Honda Odyssey]
• J35A8
  • 2007-2008 Acura TL Type-S
• J35A9
  • Honda Ridgeline
  • Honda Pilot (VTM-4 models)
• J35Z1 - Variable Cylinder Management
  • 2005 Honda Odyssey
  • 2006 Honda Pilot (front-wheel-drive models)
• J35Z2 - Variable Cylinder Management
  • 2008+ Honda Accord (except V6 6MT coupe)
• J35Z3
  • 2008+ Honda Accord Coupe 6MT

[edit] J37

The latest variant J37A1 displaces 3664 cc with bore 90 mm (3.5 in) and stroke of 96 mm (3.8 in). Compression ratio is 11:1. Rated output is 300 hp (220 kW) at 6000 rpm and 275 lb·ft (373 N·m) at 5000 rpm.

• J37A1
  • 2007+ Acura MDX
  • 2009 Acura RL (the J37 version in the 2009 Acura RL will have an innovative new VTEC valvetrain system for both the intake and exhaust valves and most likely will receive a different engine code)

[edit] See also

• List of Honda engines

[edit] References

• Car and Driver magazine, November 1996, p111