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ENGINE CHOICES
There are basically 2 types of K series, the economy versions and the performance versions.
First I will talk about the performance versions.
The following engines are performance oriented with 3 lobe Vtec on both camshafts, similar to the DOHC VTEC engines we all love:
K20A2 found in 02-04 acura RSX type-s
K20A (jdm only) found in JDM ITR and CTR, also UKDM ITR. UKDM CTR is like our K20A2 but with LSD
K24A2 found in USDM Acura TSX. Only available in America
K20Z1 found in 05+ RSX type-s
K20Z3 found in 06+ Civic SI
Ok all of these engines are basically similar. The ITR, CTR, K20Z1 and K20Z3 have better cams than the K24a2 and K20a2.
For Drag racing the K24a2 is the best platform. The K24a2 head has more meat to port out and flows similar to the others. All of the heads flow amazing and most 300whp+ motors have stock headwork still. The heads are not what needs improvement on these engines, its the induction systems that are lacking (unlike B series which lack in the head department in comparison).
Now for the Economy engines. Although they say I-vtec on them still they are quite different. They don't have any vtec on the exhaust camshaft, and on the intake camshaft its just a Two lobe system instead of three. Their vtec activates at 2200rpm and just helps with fuel ecomony. That said these are still big motors and make extremely fast cars for a budget (most can be had for $800 to $1200).
K20A3 found in 02-05 Civic SI hatchback and 02-05 RSX base model
K24A1 found in Honda CRV 02+
K24A3 found in Honda Accords
K24A4 found in Honda Accords
