First of all, the K24A2 has a deeply revised bottom end. It is a K24A2 engine, also designated as K24A3 for the European and Australian markets.
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With the following changes, the engine was able to fit in the more stringent environmental standard.īesides those regular engines, the K24A series also includes the true Honda's performance unit for their sporty models. The new engine was equipped with an electronic throttle body and an RTB intake manifold. The K24A4 was slightly upgraded in 2006 and got a new index - K24A8. This engine has its own pistons and increased compression ratio up to 9.7:1, modified intake and exhaust ports inside the cylinder head, an aluminum 1-stage RAA intake manifold, and other i-VTEC settings over the K24A1 had. There was one more mass-market modification in the engine range - the K24A4. The K24A1 had the lowest compression ratio between others in the series - 9.6:1. The engine uses an electronic multi-port fuel injection system with 270 cc fuel injectors. It was equipped with a variable geometry intake manifold (Honda's 2-stage PPA intake manifold made from aluminum and composite material) and a 60 mm throttle body. 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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