The J25A used a 10.5:1 compression ratio and was a SOHC VTEC design. The J25A was used only in the Japanese domestic Inspire/ Saber models. Some versions were able to turn off one bank of cylinders or one cylinder on opposing banks, allowing for three-cylinder use under light loads and four-cylinder use under medium loads. Initially, the system turns off one bank of cylinders under light loads, turning the V6 into a straight-3. One unique feature of some J-family engine models is Honda's Variable Cylinder Management (VCM) system. VTEC variable valve timing is used on almost all applications, with exceptions being the J30AC and J35Y8 (which use Variable Timing Control instead). All J-series engines are gasoline-powered, use four valves per cylinder, and have a single timing belt that drives the overhead camshafts. It has a shorter bore spacing (98 mm (3.86 in)), shorter connecting rods and a special smaller crankshaft than the C-series to reduce its size. Also unlike the C series, the J-series was specifically and only designed for transverse mounting. The J-series is a 60° V6 unlike Honda's existing 90° C-series engines. It is built at Honda's Anna, Ohio, and Lincoln, Alabama, engine plants. The J-series engine was designed in the United States by Honda engineers.
The J-series is Honda's fourth production V6 engine family introduced in 1996, after the C-series, which consisted of three dissimilar versions.
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