![]() ![]() J30A1 is the first modification of the engine, here the VTEC is activated after 3,500 rpm. J30A engine modifications and differencesġ. This is the only version that has not yet been discontinued. Today, you can buy an Acura RDX in China, and it will be fitted with a J30Y engine. This 3-litre engine was manufactured until 2007, and then it was replaced by the popular J35. Based on the J30A engine, a while family of J engines was developed: J25, J32, J35 and J37. The diameter of the throttle body is 60mm and the firing order is 1-4-2-5-3-6. The J30A engine uses 240 cc/min fuel injectors. Here are the valve clearances for a cold engine: 0.2-0.24 mm for intake valves, 0.28-0.32 mm for exhaust valves. In addition, you should adjust valves after every 25,000-30,000 miles. Don’t underestimate it, since if the belt breaks the valves will be bent. The camshafts are rotated by a timing belt to be replaced after every 60,000 miles. The J30A is also equipped with a variable valve timing and lift electronic control system VTEC. These heads use 34 mm intake valves, and 29 mm exhaust valves. This provides the displacement of 3 litres and the cylinder block is covered with two 12-valve SOHC heads. Inside this block, there is has a crankshaft with the stroke of 86 mm, 162 mm connecting rods and 30 mm compression height of the pistons. This is a typical 60° V6 engine with a compact aluminium cylinder block, its bore spacing is 98 mm, and the deck height is 235 mm. For those interested, In 1997, J30A engine was launched with the displacement of 3 litres.
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