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Message: <blockquote data-quote="nsbone" data-source="post: 69359" data-attributes="member: 137">BTW there's side effect of longer stroke against the HP, as this will reduce happy revving comparatively, since HP is ratio of  rpm. And perhaps that's the reason for the puny 1 hp increase. But a monster V12 5.0L has only 75mm stroke per cylinder with same bore. But in this case displacement gives the torque impact but shorther stroke means it's a hi revving engine, you'd probably almost wont feel it.Or compare between earlier perdana 4 cyl 2.0L vs later V6 2.0L which has longer stroke?Perhaps a 3.0L (is it?) F1 engine comes with 10 cylinder, to balance between torque revving-ability (shorter stroke relatively) and high torque etc etc. But as technology progresses, eg a 3.0L M30 (Str 6) vs 3.0L M60 (V8) vs 3.0L M5x (Str 6-DOHC and vanos-for torque/HP improvement) will give us different view to the basic formula. This is also similar to other creativity like VVTI, VTEC and campro(???), or 8valve, 12V, 16V, single cam, dual cam, single spark, dual spark..... and technology from audi, porche, VW as well super bikes of the oldies and the new schools...</blockquote>