12-02-2005, 12:49 PM
Andy Wrote:My impression is that oversquare motors VE drops at the upper rpm ranges due to piston speed and a miniscule dwell time. Though FI would appear to remedy the VE issue.
Though what do I know. Honda's K-series is square (86mmx86mm) and it revs like hell too.
Huh?? Oversquare (or I should say motors with a smaller stroke) have lower piston speeds. I'm fairly sure oversquare motors have higher VE at higher rpm. Look at motorcycle engines, they are oversquare with very short strokes and rev to 14k + rpm. It also has alot to do with rod stroke ratio. A longer rod slows piston acceleration near TDC.