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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
DIY Naturally Aspirated 6.2L Build
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<blockquote data-quote="B E N" data-source="post: 1655121" data-attributes="member: 33355"><p>If you can find a block that is in good shape I would be really inclined to keep the bore to a minimum. Thin cylinder walls are no ones friend and these blocks aren't real meaty to begin with, it also gives you a chance to bore it again in the future if required.</p><p></p><p>Rather than trying to up the displacement (6.2l-6.6l is 6%) increase the rev range like you are talking using quality bottom end parts and good cylinder head components. A peak power rpm increase from 5500 rpm to 6000 rpm is 9%, so you are already exceeding the strokers airflow ability. If you can push to 6500 you will be even better off. When you start adding head flow and cam lift to the equation you can get where you need to be. Yes the extra 6% displacement will net 6% flow across the board but for a driver, and the cost of all the parts involved it just doesn't make sense. Just different ways of achieving the same thing, max effort would be a stroker that revs.</p><p></p><p>Boost will net you far more power, for less cost, 7.3 psi = 50% flow increase. It will also drive around better and it is very likely your fuel economy will be better with a supercharger than it will be with a stroker (at least when cruising).</p></blockquote><p></p>
[QUOTE="B E N, post: 1655121, member: 33355"] If you can find a block that is in good shape I would be really inclined to keep the bore to a minimum. Thin cylinder walls are no ones friend and these blocks aren't real meaty to begin with, it also gives you a chance to bore it again in the future if required. Rather than trying to up the displacement (6.2l-6.6l is 6%) increase the rev range like you are talking using quality bottom end parts and good cylinder head components. A peak power rpm increase from 5500 rpm to 6000 rpm is 9%, so you are already exceeding the strokers airflow ability. If you can push to 6500 you will be even better off. When you start adding head flow and cam lift to the equation you can get where you need to be. Yes the extra 6% displacement will net 6% flow across the board but for a driver, and the cost of all the parts involved it just doesn't make sense. Just different ways of achieving the same thing, max effort would be a stroker that revs. Boost will net you far more power, for less cost, 7.3 psi = 50% flow increase. It will also drive around better and it is very likely your fuel economy will be better with a supercharger than it will be with a stroker (at least when cruising). [/QUOTE]
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