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Message: <blockquote data-quote="amdfaisal" data-source="post: 1841948" data-attributes="member: 4871">smooth VTEC transition for the i-VTECs in the new civics/accords/CRV/stream i think since it's the transition from 12-valve operation to 16-valve operation as seen in D15B and also D17A. refer http://asia.vtec.net/article/k20a/index.html and http://asia.vtec.net/article/ivtec/index.htmlfor those high perf EP3, DC5, CL7 (not that fast), a different approach was taken. these K20A R are permanent 16-valvers with a switch of profile depending on the rpm (engine load). This profile switch occurs on both intake and exhaust.http://asia.vtec.net/article/MME2004ET1/index1.htmlif u read american forums... lots of ppl are dumping their normal K20As for the 'R' K20As... different tech altogether and of cos different power le...and yup.. add that VTC thingy also... to improve low-end + mid-rangejust my comprehension from the articles read</blockquote>

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