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Two versions of i-vtec are used on the K-series motor.

On engines like the K20A3 & K24A3 , found in our local CRV & ACCORD type-S, this type of vtec system only operates on the intake cam. At low rpm,only one intake valve opens fully, the other slightly, to create a swirl effect in the combustion chamber for improved fuel atomization and economy. At high rpm, BOTH intake valves operate the same,to improve power and torque.

On engines like the K20Z4, found in our local Civic Type-R (FN2), the vtec system operates on both the intake and exhaust  valves, allowing the benefit of multiple cam profiles & vtec at all times during the rev range.

SPECIFICATIONS:

K20A

2007 CIVIC TYPE-R 4 door(FD2)

Displacement: 1998cc (86mm x 86mm)

Compression: 11.7:1

Power: 165kw @ 8000rpm

Torque: 215nm @6100rpm

Redline: 8400rpm

Vtec engagement: 5600rpm 

K20A3

2002-2007 CRV & FRV

Displacement: 1998cc (86mm X 86mm)

Compression: 9.8:1

Power: 119kw @ 6500rpm

Torque: 179nm @5000rpm

Redline: 6800rpm

K20Z4

2007 CIVIC TYPE-R 3 door (FN2)

Diplacement: 1998cc (86mm x 86mm)

Compression: 11.0:1

Power: 148kw @ 7800rpm

Torque: 193nm @ 5600rpm

Redline: 8200rpm

K24A3

2003-2007 ACCORD TYPE-S

Displacement: 2354cc ( 87mm x 99mm)

Compression: 10.5:1

Power: 140kw @ 6800rpm

Torque: 223nm @ 4500rpm

Redline: 7400rpm 

Vtec engagement: 6000rpm 

K23A1 (turbo)

2007-2008 ACURA RDX

Displacement: 2300cc  (86mm x 99mm) (acura.com)

Compression: 8.8:1 (acura,com)

Power:179kw @ 6000rpm (SAE net)

Torque: 353nm @ 4500rpm (SAE net)

Redline: 6800rpm (acura.com)