I'm a newbie to this forum...was told the RSX has the same engine as the civic. Anyone care to ellaborate?
I'm looking into purchasing a new RSX.
Thanks..

 

the civic si hatchback has the same k20a3 motor as the base model rsx
hope that clarifies things

 

and the TypeS has an engine that is similar, but produces more HorsePower.

 

The EP3 Civic SI hatchback has a detuned version of the base RSX engine. No other (stock) USDM Civic is sold with a K series motor.

While the base RSX engine is a nice smooth high quality engine, it doesn't have the third cam profile that the K20A2 (Type-S engine) has and as a result doesn't have the top end power.

 

i dont think they detuned the k20a in the EP Si
i think they are rated the same @160 bhp in BOTH the base rsx and Si

 

Special note: The K20A3 engine used in the Acura RSX base has a slightly different intake manifold design from the K20A3 engine used in the Civic Si. The RSX engine uses a dual-stage manifold, similar in concept to the manifold of the B18C1 in the old Integra GSR. It uses long intake runners at low-RPM to retain low end power, and switches at 4700RPM to a set of shorter intake runners to enhance high-end torque. This accounts for the extra 9 ft-lb of torque in the RSX (141 ft-lb, vs. 132 ft-lb in the Civic Si).