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Originally Posted by Siriusly.Andrew
Mary-go-round works, at least it worked for me.
And in the scheme of things aren't all engines "archaic"? I'd say it really does come down to the technology advancements versus the engine designs. Engine design has been primarily unchanged for the last century with the significant changes being in materials and the afore-mentioned changes in tech (SOHC vs DOHC, timing chain > timing belt, push rods vs cam shafts etc. etc.).
I definitely don't know the full history of the changes, but the principle and primary design, as to say cylinder lay out and 4 stroke etc, has been standard for... I would have to guess a little over a century. Except for those guys at Mazda and their crazy Wankel.
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Most of the major EJ changes are done to the head(s). Basically what seems to have stayed the same with the EJ will have been its bore spacing and mounting points for engine to chassis and for transmission to engine, and the fact that is some kind of OHC. It has come in displacements ranging from 1.8L (maybe less in Japan or Europe?) to 2.5L, so there is no need for major changes to the bottom end for displacement changes. Fundamentally its a very solid starting point for whatever they want to do to this motor.
Quote:
Originally Posted by MatadorRacing_F1
Subaru has AVCS and AVLS, Doubt either will be present though. Toyota is working on the engine heads. They are implementing D4-S (direct injection).
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AVCS is cam phasing (VVT-i)? And AVLS is profile changing (VTEC)? Which systems are on which current motors?
Either way if it's NA it will at least have AVCS/VVT-i. That is pretty much required for a combination of any form of performance with good emissions.
As for profile changing, Toyota seems to have moved away from VVTL-i, (the Lift part anyways). Why is that? Cost? Or just not having a performance platform to bother putting it in?