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2012-2013 Boss 302 Mustang
Whats next for more N/A power?
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<blockquote data-quote="Rebel302" data-source="post: 12439245" data-attributes="member: 138366"><p>Seems as though we all had a slight misconception here...</p><p></p><p>:read:"The spring is typically designed so that at max lift there is not a lot of room for the coils to surge up and down. The base spring (Coyote) was designed for 12mm lift, and there is only another millimeter before it goes completely solid, which wouldn't have worked, so we lowered the solid height on the spring so we could get to the 13mm lift and still have a half a millimeter of clearance before it went fully solid. So in addition to the higher load, we had to take out some coils." ---quote from Kevin Shinners from the RR team</p><p></p><p>That being said, that explains why the Comp cams(which were designed for the Coyote to begin with and have 12.5mm of lift) need limiters while the Boss upgrade cams/Cobra Jet (which have 13mm of lift) do not when installed on a Boss. I'm sure if someone took the time to do the clay check on the comp cams in the Boss, you probably wouldn't need the limiters technically. But when reading the article I posted before about the Comp cams, they were designed with the limiters and not having to upgrade the springs in the Coyote in mind.</p><p> It has nothing to do with "deeper valve pockets" as the 302R didn't have an issue with p2v clearance. It's the same motor with a 12qt oil sump and a few other ancillary differences.</p><p></p><p>We all said we read the articles....but did we really? :dw:</p></blockquote><p></p>
[QUOTE="Rebel302, post: 12439245, member: 138366"] Seems as though we all had a slight misconception here... :read:"The spring is typically designed so that at max lift there is not a lot of room for the coils to surge up and down. The base spring (Coyote) was designed for 12mm lift, and there is only another millimeter before it goes completely solid, which wouldn't have worked, so we lowered the solid height on the spring so we could get to the 13mm lift and still have a half a millimeter of clearance before it went fully solid. So in addition to the higher load, we had to take out some coils." ---quote from Kevin Shinners from the RR team That being said, that explains why the Comp cams(which were designed for the Coyote to begin with and have 12.5mm of lift) need limiters while the Boss upgrade cams/Cobra Jet (which have 13mm of lift) do not when installed on a Boss. I'm sure if someone took the time to do the clay check on the comp cams in the Boss, you probably wouldn't need the limiters technically. But when reading the article I posted before about the Comp cams, they were designed with the limiters and not having to upgrade the springs in the Coyote in mind. It has nothing to do with "deeper valve pockets" as the 302R didn't have an issue with p2v clearance. It's the same motor with a 12qt oil sump and a few other ancillary differences. We all said we read the articles....but did we really? :dw: [/QUOTE]
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2012-2013 Boss 302 Mustang
Whats next for more N/A power?
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