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New Edge Cobras
FR500 cams sound clips?
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<blockquote data-quote="na svt" data-source="post: 4612673" data-attributes="member: 35346"><p>Your 4v would make peak power at 9k if it idled like that.</p><p></p><p></p><p>To get the nasty idle you need cams that have a narrow LSA, 108-110 (which means a lots of overlap). The Comps have wide LSAs so to get that idle you have to go with the 106500s installed per the specs or you could go with the 106300s or 400s and install them with a 110 LSA. You could time your cams at an intake LC of 107 and exhaust LC of 109 (108 LCA) and you could possibly get that nasty idle with stock cams. </p><p></p><p>The FR500s have an LSA of 109 but the .050 durations are a little less than the 106300 comps, the adv durations are similar which means the ramps are a lot less aggressive.</p><p></p><p>So, it's not the duration or lift that results in the "sound", it's the overlap.</p><p></p><p>BTW, 2V engines use LSAs more narrow than 4v engines because they are under valved and the added overlap increases cylinder filling. BB and stroker engines can get away with even tighter LSAs because they are more undervalved than standad bore/stroke motors.</p></blockquote><p></p>
[QUOTE="na svt, post: 4612673, member: 35346"] Your 4v would make peak power at 9k if it idled like that. To get the nasty idle you need cams that have a narrow LSA, 108-110 (which means a lots of overlap). The Comps have wide LSAs so to get that idle you have to go with the 106500s installed per the specs or you could go with the 106300s or 400s and install them with a 110 LSA. You could time your cams at an intake LC of 107 and exhaust LC of 109 (108 LCA) and you could possibly get that nasty idle with stock cams. The FR500s have an LSA of 109 but the .050 durations are a little less than the 106300 comps, the adv durations are similar which means the ramps are a lot less aggressive. So, it's not the duration or lift that results in the "sound", it's the overlap. BTW, 2V engines use LSAs more narrow than 4v engines because they are under valved and the added overlap increases cylinder filling. BB and stroker engines can get away with even tighter LSAs because they are more undervalved than standad bore/stroke motors. [/QUOTE]
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