BooWFO said:You all forgot the fact that the PI cars have slightly better, intakes and cams. Combined the heads, intake, cams make them PI.
Seraphitia102 said:what is PI and non-PI? I hear these terms and have no clue what they are. Is my car PI or non-PI?
Shiroelex said:PIITB = :SNSign:
MBDiagMan said:One of your questions has still not been answered. An S281 is a supercharged engine, so whether or not the base engine is PI or not you are WAaay up on power compared to a normally aspirated (non super charged) engine of either type.
As explained, this involve different and MATCHING cams, heads and intake manifold.
The Cams are entirely different in that the earlier cams are designed with a longer duration (leave the valves open longer), shorter lift philosophy while the PI cams use a shorter duration, higher lift philosophy.
The cam design philosophy change is to take full advantage of the high flow characteristics and flow pattern of the PI heads. For this reason if one were to change heads on an early engine to PI, they will be missing some of the power addition available if they do not also use PI intake and cams.
MBDiagMan said:One of your questions has still not been answered. An S281 is a supercharged engine, so whether or not the base engine is PI or not you are WAaay up on power compared to a normally aspirated (non super charged) engine of either type.
As explained, this involve different and MATCHING cams, heads and intake manifold.
The Cams are entirely different in that the earlier cams are designed with a longer duration (leave the valves open longer), shorter lift philosophy while the PI cams use a shorter duration, higher lift philosophy.
The cam design philosophy change is to take full advantage of the high flow characteristics and flow pattern of the PI heads. For this reason if one were to change heads on an early engine to PI, they will be missing some of the power addition available if they do not also use PI intake and cams.
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