Improving on its already sky-high 10.6 compression ratio, Honda created a new
pistonhead that increased the compression ratio to 11.0. By doing so, the burn-off response
increased, helping heat dissipation, as well as improving torque throughout the powerband.
The VTEC valve timing, lift, and duration were also adjusted as well. The valve lift on the
intake reaches 12.2mm, while the exhaust end reaches 11.2mm. As far as production engines go,
these are really high numbers. |
SiR Piston
Type S Piston |