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Originally Posted by Dragoneye
I'm still curious how Ford plans to make 100 more hp out of .4 liters without direct injection. Does the 4.6L suck that bad??  |
The changes are a bit more involved than another .4L, although the biggest improvement is indeed due to the larger bore that goes part way toward giving us that extra .4L. The trick here is that the improvement yielded by boring this engine block has more to do with how small the bore was to begin with rather than a simple displacement increase.The problem here is that the 4.6L's 3.5 inch bore really stymies engine breathing, so badly in fact that it has put a limitation on the level of improvement you can expect from improved cylinder heads in naturally aspirated trim. This is one of the reasons why forced induction seems like it works so well on these engines, the valve shrouding the smaller bore brings to the table becomes a far less important issue when the atmosphere turns artificial.
The 5.0L 'revision' solves this problem by moving to a ~3.63 inch bore, which may not seem like much at first glance.....but it transforms this engine. The GT500/GT derived heads this package will utilize make sure that bigger-bore, problem-solver of an engine block is topped by the best set of cylinder heads a Mod motor has ever seen. Throw in a revised fuel injection system and a revised intake setup and 100hp isn't at all difficult to believe. In fact, at this moment in time 400hp is just about exactly where a well-executed, mass-production, hi-po take on a DOHC 5.0L V8 should be.
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They won't...and I don't think they plan to until direct injection comes out.
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Believe what you will. It's 400+hp and that is without direct injection. Even better? The engine represents a noticeable fuel economy improvement over the 4.6L it replaces.