![]() At high engine speeds, both intake valves open fully to improve engine breathing. The VTEC system on engines like the K20A3 only operate on the intake cam at low rpm only one intake valve is fully opened, the other opening just slightly to create a swirl effect in the combustion chamber for improved fuel atomization. Two versions of the Honda i-VTEC system can be found on a K-series engine, and both versions can come with variable timing control (VTC) on the intake cam. K20 uses the short block with a deck height of 212 mm (8.3 in) where K23 and K24 block has a deck height of 231.5 mm (9.1 in). Similar to B series, the K-series car engines have two short blocks with the same design the only difference between them being the deck height. The cylinders have cast iron sleeves similar to the B- and F-series engines, as opposed to the FRM cylinders found in the H- and newer F-series engines found only in the Honda S2000. This system forgoes the use of a conventional distributor-based ignition timing system in favor of a computer-controlled system that allows the ECU to control ignition timings based on various sensor inputs. ![]() The engines use a coil-on-plug, distributorless ignition system with a coil for each spark plug. The K-series engines are equipped with DOHC valvetrains and use roller rockers on the cylinder head to reduce friction. The Honda K-series engine is a line of four-cylinder four-stroke car engine introduced in 2001. Components of the i-VTEC system can be seen.
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