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Historically Subaru rarely introduces an all-new model, with all new running gear, all in the same year. The last Subaru to do that was the SVX back in '91. I expect to see the following on the Tribeca, perhaps starting with MY07: • A turbo trim level• A larger displacement H-6. It's well known that they have a 3.6 H-6 in the works.• Detail content upgrades such as xenon headlights, auto up/down window switches, and so forth
Technically, Subaru could increase the bore. I'm not saying they should, but they could. Using a technique similar to Honda's quad sequential-sleeve design, they might get the the distance between bores below 9mm. Honda got it down to 6mm.
With this liner construction, the web distance, or distance between the inner walls of the adjoining cylinders, could be reduced to 6 mm from the separate lines' 9 mm, while retaining the same bore pitch. This was the essential requirement so that the new block could be cast and machined on the existing Suzuka lines.
"Getting a new bore pitch-the distance between two adjoining cylinder centers-is really a once-in-your-engineering-life occurrence," said Sekine, "so significant is its influence."
They could stroke it - remember the Tribeca's platform is wider, so it could accomodate a 3.3-3.6l or so engine based on the EZ30.
Or we could see some form of the EJ257 turbo, maybe with 280-300hp if Subaru wanted to keep it affordable.
An STi could get the H6 and a turbo, but that would put prices in the $40s, and then everyone would be screaming about the price.
I bet there are several design studies going on simulateously. The ST-X had a supercharged engine that never made it to production. So just because a certain engine is rumored, even factual, does not mean it will make production.
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