The K20A VTC (Variable Timing Control) is designed to work with the standard pistons and camshafts. If used with either high lift camshafts and/or high compression pistons, the standard VTC and standard ECU settings may cause the valves to come close or in some cases touch the piston. Retaining the VTC system for the advancing of any high lift cam brings benefits to low end power and low speed drivability. Though even when the ECU is able to control the amount of advance that the cam can rotate through, it is difficult to know precisely how far the VTC has actually advanced. With tuned engines the full amount of advance can lead to no or very little clearance. TODA Racing has designed a range of mechanically limiting advancing cam-sprockets to prevent over advancing of the intake camshaft. Please choose from the range below the cam-sprocket which suits your particular application.
K20A Intake VTC Control Cam Sprocket
VTC Operating Range 30 degs 35 degs 40 degs
Part No. 14210-K20-V30 14210-K20-V35 14210-K20-V40
Price ¥30,000 ¥30,000 ¥30,000
Remarks *K20A standard VTC has the range of 50degs.
*Indicated angle is the crankshaft angle.
VTC Operating Range Reference Data
*Piston to valve clearance IN: 1.5mm and EX: 2.0mm
*With stock EX cam pully or TODA adjustable cam sproket at the center position.

The information will be affected by the engine modification (cylinder block or head milling) and valve timing. Please be sure to have enough clearance with VTEC high lift cam.

*** No milling in cylinder head and block, 0.6mm head gasket ***
Piston Camshaft
A2 A3 C D E F
Stock 40 degs 40 degs 40 degs 40 degs 35 degs 35 degs
TODA High Comp 40 degs 40 degs 40 degs 40 degs 40 degs 40 degs
TODA High Comp
30 degs 30 degs 30 degs - - -
TODA 2150 KIT 40 degs 40 degs 40 degs 40 degs 40 degs 40 degs
TODA High Comp
40 degs 40 degs 40 degs 40 degs 40 degs 40 degs
TODA 84mm Short Stroke KIT 35 degs 35 degs 30 degs 30 degs 30 degs -