The intake valve diameter is 35 mm, exhaust valve - 30 mm valve stem diameter is 5.5 mm. This power unite had the i-VTEC on the intake camshaft only. It was a start line for the all K24 engine series. The base K24A1 version was produced from 2001 to 2006. The periodic valve clearance adjustment is needed. The chain-driven intake and exhaust camshafts open and close valves via roller rocker arms without hydraulic tappets. The cylinder head design stayed untouched: it's made from aluminum, 16 valves (four valves per cylinder), dual overhead camshaft, central-located spark plugs with individual coils (coil-on-plugs), and i-VTEC system. Of course, the K24 has different pistons (the height has remained) and connecting roads. K24A block has a deck height of 231.5 mm. The engine got the new crankshaft with an increased stroke by 13 mm, and cylinders were bored out by 1 mm. Like the K20, the K24A has an aluminum cylinder block with cast iron.
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