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Originally Posted by Exage
I found something interesting when calculating the FB25 de-stroked engine.
We de-stroke it by 18mm which means the piston is sitting 9mm lower in the cylinder at TDC (,9mm higher at BDC) with a 129.3mm rod. A 129.3mm rod to 72mm stroke is 1.796 (higher than K20, 2ZZ: 1.62).
Stock CR was 10.5:1 leaving 9.4737mm between piston and head with a 90mm stroke. With a 72mm stroke it would need 7.5790mm between piston and head to maintain 10.5:1 CR.
This is of course without lowering the FB25 deck height, would mean that it would need a 10.89mm longer rod then the 129.3mm to maintain 10.5CR on a 72mm stroke resulting in a 1.947 rod-stroke. Might be a good custom race engine (it would be better with a semi/closed deck and) with the appropriate work on the heads and timing.
So it could be a FB20. Unless they decreased the deck height... Any thoughts?
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Originally Posted by sneaky
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This is interesting, we've been speculating a bit on this already:
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Speaking to CarAdvice in New York, Subaru’s Impreza Product General Manager, Mr Akihide Takeuchi, said work on the replacement turbocharged engine has commenced but would not give any further details. He did confirm that it will not be based on the EJ25 and will not simply be a turbocharged version of the new boxer engine.
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What do you think of this?