Why doesn’t Subaru use DOHC on non-turbo models?
The Toyota Corolla even Yaris has Dual OverHead Cam, comes standard. On the non-turbo Subaru’s it is SOHC.Why can’t they use DOHC? I like the Legacy 2.5i, but since it’s SOHC, is it slow? or does it have good pick-up?
Subaru switched back and forth several times. In the end especially on non turbo models they found that the gains from a DOHC setup were basically offset by the losses to additional rotating mass etc and unnecessary complexity. Also a DOHC boxter motor requires 4 camshafts instead of 2 like an inline engine. Back when they started selling the “sportier but still not a wrx” 2.5 RS they were DOHC for a year or two and then went back to SOHC without any real change in the power of the motor. Heck the new corvettes are killer fast and they have a single not overhead cam and they do fine. DOHC in and of itself doesn’t really make that much extra power, its just easier to build a 4 valve per cylinder engine with opposing pairs of valves with 2 cams instead of one.
T-Cam with Lewis Hamilton F1 2010
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