The newest engine in the Honda tuning community. The "K Series" is Honda's mass produced version of the roller rocker valve train assembly found in the S2000. Less friction, more rpm potential, faster action cam profiles...this engine has untapped potential. First introduced in the JDM Integra Type-R in 2001, this engine put out a respectable 220HP @ 8000 rpm straight from the factory (DC5). The K20A also sees service in the JDM Civic Type-R, using the same compression and cam profiles. The first USDM production model was the K20A2 found in the 02-04 RSX-S. Other engines featuring the same head configuration include the K24A2 (TSX) that features a 9.114" deck height, the K20Z1 in the 05-06 RSX-S that includes various JDM Type-R add-ons like cams, throttle bodies, higher compression and Honda's answer to the tuning crowd, the K20Z3 found in the 2006-up Civic Si.
|Stage||Description||Cam #||Adv. Dur.||Dur @ .050||Lift (in)||Lift (mm)||Kit #|
|Forced Induction Specification|
Short duration profile builds cylinder pressure by reducing overlap, high lift for more air intake. Requires kit BC0040 or BC0040S.
|Normally Aspirated Specification|
Hot street/strip or road race spec. Use with CAI, H, E, ECU, A/F mods. Excellent street manners and idle quality. Requires kit BC0040 or BC0040S.
|Normally Aspirated Specification|
Intended for fully built engine. Extensive modifications, high compression pistons. Also works on K24 all motor. Requires kit BC0040 or BC0040S.
|USDM K20A2 (RSX-S)||Stock||302°/305°||219°/215°||.483"/.431"||12.27/10.95|
|USDM K24A2 (TSX)||Stock||310°/302°||210°/212°||.451"/.453"||11.45/11.50|
|JDM K20A (DC5)||Stock||320°/318°||224°/219°||.483"/.424"||12.27/10.77|
Rocker Ratio: 1.75:1 mid, 1.7:1 sec, 1.7:1 pri.
No valve timing events due to variable intake cam.
VALVE SPRING/RETAINER KIT
Designed for high rpm, BC valve springs are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. BC titanium retainers are CNC machined from 6AL4V round bar titanium to exacting tolerances. Use steel retainer for high mileage applications.
|Kit #||Spring #||Retainer #||Seat #||Description|
|BC0040||BC1040||BC2010||BC2904||Dual spring, titanium retainer/seat|
|BC0040S||BC1040||BC2011||BC2904||Dual spring, steel retainer/seat|
|BC0040X||BC1040||BC2010||No Seat||Dual spring, titanium retainer|
|BC0040SX||BC1040||BC2011||No Seat||Dual spring, steel retainer|
BC1040 Seat: 1.590" @ 80 lbs / Open: 1.110" @ 250 lbs / Coil Bind: 1.030" (no machine work required)
If running 2006-up K20Z3 cylinder, you may need to purchase BC2940 keepers to accommodate the BC2010 or BC2011 retainers.
STAINLESS STEEL VALVES
BC valves are made from premium stainless steel, fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head.
|Part #||Description #|
|BC3040||35.0mm Intake (standard head diameter)|
|BC3041||30.0mm Exhaust (standard head diameter)|
|BC3042||35.5mm Intake (+.5mm head diameter)|
|BC3043||30.5mm Exhaust (+.5mm head diameter)|
|BC3044||36.0mm Intake (+1mm head diameter)|
|BC3045||31.0mm Exhaust (+1mm head diameter)|
K20A/K20Z 2.35L STROKER KIT
K24 BLOCK 2.6L
|Kit #||Crank #||Rod #||Piston #||Bearing #||Desc.|
|BC0044||BC5048||BC6058||BC7048||BC4020||92mm w/LW rods|
|BC0045||BC5048||BC6048||BC7048||BC4020||92mm w/heavy duty rods|
|BC0048||BC5049||BC6059||BC7049||BC4020||102mm w/LW rod|
|BC0049||BC5049||BC6049||BC7049||BC4020||102mm w/heavy duty rods|
The BC stroker kit for the Honda/Acura K Series engine platform incorporates the wider B16A bearing (.935" width) that offers more surface area than the .740" width bearing found in the OEM K Series crank and rod combination. The added surface area increases bearing life, especially at extended rpm. Note: This kit requires custom connecting rods (modified BE bore and BE width).
K20A/Z 86mm Bore x 86mm Stroke - 8.350" Block Height
K24A 87mm Bore x 99mm Stroke - 9.114" Block Height