Nissan H25 Engine Parts

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Summary

Nissan's H-series of engines were introduced in 1983, based on Nissan's F-engine block. Nissan used the H series in various applications until 2002 when Nissan M engines replaced it.

Nissan H25 Engine

Nissan's second-generation VQ engine. Produced from 1993 to 1999 with an aluminum block and head, a slight capacity increase over previous VG engines (essential capacity: 2851 cc). Bore x stroke 81.0×95 mm (3.2 in × 3.7 in), compression ratio 9:5:1; single overhead camshaft driven by a timing belt; four valves per cylinder; two parallel, gear-driven counter-rotating balance shafts located within the 'vee' to reduce second-order vibration and smooth the engine's operation.

Nissan REV Technology of these engines is a double-row roller timing chain, with a one-piece, forged steel crankshaft and cast aluminum pistons with floating wrist pins.

Nissan H25A Engine

Nissan's third-generation VQ engine shared many similarities with its predecessor, H25, while reaching further power and refinement. From 1999 to 2002, it increased displacement to 2988 cc (basic capacity: 3498 cc). Nissan REV technology was again implemented in this design for optimal durability and performance. Nissan also collaborated with Yamaha to create the variable valve event & lift system used in the VQ35DE(used by Nissan 350Z & Infiniti G35 models). A short production run of Nissan's VQ30DE(seen in Nissan Altima models), which had the Nissan REV technology implemented.

Nissan H25A1 Engine

Nissan's fourth and final generation VQ engine was produced from 2002 to 2007. Nissan REV is again a part of this design for optimal power and durability, along with Nissan's own variable valve timing system (NEMO technology). Bore x stroke 86.0×86 mm (3.4 in × 3.4 in), compression ratio 9:5:1; single overhead camshaft driven by a timing belt; four valves per cylinder; two parallel, gear-driven counter-rotating balance shafts located within the 'vee' to reduce second-order vibration and smooth the engine's operation.

Nissan REV technology is a single row roller timing chain with a one-piece, forged steel crankshaft and cast aluminum pistons with floating wrist pins. Nissan also implemented their Nissan NEMO Technology in this design, which varies the intake camshaft phase and duration to achieve optimal power and torque throughout the engine's rev range. Nissan has stated that there was no VQ35HR(H25R) version as many speculated due to Nissan's REV & Nissan NEMO technologies present in this design.

History of Nissan H25 Engine

Nissan has three different types of high-performance camshafts that can be utilized in their Nissan G engines; Nissan GTR High-Performance Camshafts, Nissan 370Z/G37 High-Performance Camshafts, Nissan G25/G35 High-Performance Camshafts. Nissan's GTR high-performance camshafts are Nissan REV technology seen in Nissan race applications such as the Nissan Skyline race cars that compete in D1GP sanctioned worldwide drift events. Nissan also utilizes Nissan 370Z & Infiniti G37 high-performance camshaft profiles within Nissan's newly designed Nissan FM platform models. Nissan utilized a similar design for their H series engines during a short production run of the VQ30DE, which had a unique Nissan NEMO Technology implemented with variable intake lift and duration to achieve optimal power and torque throughout the rev range engine.

Although several engine variations were produced, Nissan utilized much of the same design throughout these variations. Nissan's H20 engine was Nissan's first water-cooled four-cylinder to house Nissan's REV technology in their FWD applications after the discontinuation of Nissan's L series engines produced from 1975 to 1984. Nissan continued that tradition with Nissan G series engines, and Nissan H20 was one such engine in this line.

Nissan currently produces three high-performance camshafts for their VQ35DE; Nissan GTR High-Performance Camshafts, Nissan 370Z/G37 High-Performance Camshafts, Nissan G25/G35 High-Performance Camshafts. A fourth type is also available through GReddy as a complete valve train set Nissan 370Z/G37 Complete GReddy Nissan High-Performance GTR GT-K Evo Valve Train Kit. Nissan's GTR high-performance camshafts were explicitly designed for Nissan race applications such as the Nissan Skyline that compete in D1GP sanctioned worldwide drift events. Nissan also utilizes Nissan 370Z & Infiniti G37 high-performance camshaft profiles within Nissan FM platform models.

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Takeaways

• Nissan REV technology was again implemented in the H25 design for optimal durability and performance.

• Nissan REV technology is a single row roller timing chain with a one-piece, forged steel crankshaft and cast aluminum pistons with floating wrist pins.

• Nissan's GTR high-performance camshafts were explicitly designed for Nissan race applications such as the Nissan Skyline that compete in D1GP sanctioned worldwide drift events.
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