The engine efficiency also was improved by a 10:1 compression ratio. The cylinder head was equipped with larger valves the diameter of the intake valve is 35 mm, of exhaust - 30 mm. The new engine, marked as J35A4, has a revised intake system (64 mm throttle valve, a new intake manifold), redesigned exhaust system, and an improved VTEC system. In 2001, the J35A1 went through a significant upgrade. The J35A8 got a new 2-stage intake manifold activated at 4,000 rpm, fitted with a cold intake. There are modified heads with 36 mm intake valves, optimized intake ports, and hollow camshafts inside. The next J35A8 engine (2005-2008) for Acura models had a compression ratio of 11:1, oil jets for cooling pistons, and new connecting rods. The VTEC engagement was moved to 4,400 pm. It had a new cylinder block with cast iron sleeves, a new 2-stage intake manifold, an electronic throttle body, a better exhaust system, tuned camshaft. Like the previous engine, this power unit was installed in the MDX. This engine was laid in the base of the J35A5, produced from 2002 to 2006. It features a 10:1 CR, 2-stage intake manifold, a new engine control unite, and settings for the VTEC engagement. In 2000, the manufacturer introduced a slightly improved version of the J35A1 - the J35A3 engine for the Acura MDX. This engine also had a 9.4:1 compression ratio. The J35A1 intake system includes an aluminum 1-stage intake manifold and 55 mm throttle body. The J35A1 features 34 mm intake valves and 29 mm exhaust valves. Valves are pushed by roller rocker arms (there are no hydraulic tappets). The valve train is equipped with Honda's VTEC system. On top, there are aluminum cylinder heads with four valves per cylinder and a single overhead camshaft.
This stroked J32 also has 158.5 mm long, lightweight connecting rods. The bore size and pistons remained the same, but a new forged crankshaft provides a longer 93 mm stroke. Like the J32A, this engine has a compact aluminum cylinder block with a 60-degree angle between cylinder banks. The J35A engine stayed in production for almost fourteen years (1998-2012).
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