Quote:
Originally Posted by serialk11r
If they reduce stroke to 75mm, and then increase compression ratio to say, 12:1, that would take off 32ish mm. If the width grows by a full 36mm, that would create some issues...and 75mm stroke is unlikely as people said. Rather disappointing since Valvematic reduces pumping loss by a ton (especially if the exhaust timing is right), and allows for better flowing ports.
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It's unlikely that we'll see any cam-shift or variable lift mechanism on the engine. Subaru could implement i-AVLS, however all single cam-shift (lift) mechanisms are being replaced by the variable ones.
For the cost and simplicity sake of the engine I'd see them just running AVCS with the D4-S at high compression. 7Xmm stroke would work but not for production, depending on what the new WRX (and STI) cranks will be put in, I could see them squaring the FB up with stroke around 86mm.
Perhaps what should keep our eye out for is the aforementioned engines (WRX and STI), because I would be surprised if they kept the 90mm stroke as well (Dimman has eluded to this on more than one occasion). Has there been any word on the release of the new WRX/STI models? Or is it going to be a Toyota, Subaru launch fest at Tokyo?