Originally Posted by 98CoupeV6
K20 Si and K18 base.
Actually, I've heard the 1.8-liter SOHC i-VTEC engine will use the designation
R18 and the 2.0-liter DOHC i-VTEC will use the designation
K20Z3, since the Civic Si coupé's engine is actually a derivative of the Acura RSX Type-S engine.