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5.0 voodoo engine?
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<blockquote data-quote="Jroc" data-source="post: 13724693" data-attributes="member: 51847"><p>I think they would need to make a block to work with the heads instead of trying to mod Coyote heads to work on a 5.4. If they'll work on a 5.4 then they'll work on a 4.6. Coyote heads use different coolant passages and things like that. Also a Coyote has a different firing order than a 4.6/5.4 based Modular. Besides 00 Cobra R/FGT/GT500 heads already flow about as well as the small Coyote head.</p><p></p><p>Your kind of missing my point. I'm not knocking more displacement. What I'm saying is a 5.4/5.8's extra displacement over the smaller Modulars is in the wrong place for a performance car motor. The extra displacement comes from almost an extra 5/8 length in the motors stroke over the 4.6's. A Modular has never had a problem with too little a stroke. Even a 4.6 has a decent enough stroke. A 4.6's stroke(3.543") is even longer than a 351's stroke(3.500) and a old Windsor based 302 only had a 3.000" stroke. Hell a Coyotes stroke(3.649") is longer than all your factory performance LS motors stroke other than a LS7's.(it has a 4" stroke) A 5.4's stroke is freakishly long for such a small bore.(4.165" stroke with a 3.552" stroke) This has even cause piston slap issues on 5.4's because of the long stroke/short shirts. A 5.4's rods are pretty close to contacting the small bores also. Generally manufactors will build a bigger bore/smaller stroke motor or either a bore/stroke that's similar to one another. The length of a 5.4's stroke compared to it's bore is freakish for a performance motor and it makes for much higher piston speeds at any given RPM than a 4.6/5.0 shorter stroke.</p><p></p><p>A 5.4 was developed to be a truck motor. In general when you think of a long stroke motor you think of more of a lowend stump puller, and a short stroke motor you think of more of a topend, high RPM motor. A new Boss 6.2 has a much more ideal bore/stroke(and bore spacing) than a Modular. If Ford would develop the 6.2 into a performance motor it would be one awesome motor. The 4.000+ bore is nice.</p><p></p><p>I'm not knocking having some decent stroke. I'd rather build a 351 than a old 302 SBF, but the 5.4's is really just to much for a good performance motor. The 5.4 makes good low-end power and that's exactly what Ford intended when they designed it, and not to be some powerhouse motor at high engine speeds where it will live happy all day at 7K+ RPM's.</p></blockquote><p></p>
[QUOTE="Jroc, post: 13724693, member: 51847"] I think they would need to make a block to work with the heads instead of trying to mod Coyote heads to work on a 5.4. If they'll work on a 5.4 then they'll work on a 4.6. Coyote heads use different coolant passages and things like that. Also a Coyote has a different firing order than a 4.6/5.4 based Modular. Besides 00 Cobra R/FGT/GT500 heads already flow about as well as the small Coyote head. Your kind of missing my point. I'm not knocking more displacement. What I'm saying is a 5.4/5.8's extra displacement over the smaller Modulars is in the wrong place for a performance car motor. The extra displacement comes from almost an extra 5/8 length in the motors stroke over the 4.6's. A Modular has never had a problem with too little a stroke. Even a 4.6 has a decent enough stroke. A 4.6's stroke(3.543") is even longer than a 351's stroke(3.500) and a old Windsor based 302 only had a 3.000" stroke. Hell a Coyotes stroke(3.649") is longer than all your factory performance LS motors stroke other than a LS7's.(it has a 4" stroke) A 5.4's stroke is freakishly long for such a small bore.(4.165" stroke with a 3.552" stroke) This has even cause piston slap issues on 5.4's because of the long stroke/short shirts. A 5.4's rods are pretty close to contacting the small bores also. Generally manufactors will build a bigger bore/smaller stroke motor or either a bore/stroke that's similar to one another. The length of a 5.4's stroke compared to it's bore is freakish for a performance motor and it makes for much higher piston speeds at any given RPM than a 4.6/5.0 shorter stroke. A 5.4 was developed to be a truck motor. In general when you think of a long stroke motor you think of more of a lowend stump puller, and a short stroke motor you think of more of a topend, high RPM motor. A new Boss 6.2 has a much more ideal bore/stroke(and bore spacing) than a Modular. If Ford would develop the 6.2 into a performance motor it would be one awesome motor. The 4.000+ bore is nice. I'm not knocking having some decent stroke. I'd rather build a 351 than a old 302 SBF, but the 5.4's is really just to much for a good performance motor. The 5.4 makes good low-end power and that's exactly what Ford intended when they designed it, and not to be some powerhouse motor at high engine speeds where it will live happy all day at 7K+ RPM's. [/QUOTE]
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