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New Edge Cobras
Installing cams in a DOHC 99 Cobra
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<blockquote data-quote="na svt" data-source="post: 4391656" data-attributes="member: 35346"><p>Why all the name calling? I ask again, what has put out more power than an FR500 cammed motor?</p><p></p><p>Yes, I do have aftermarket cams and I know what works well in a 4V motor. The FR500 cams, though somewhat mild, have a lot of overlap. This is a resuly of the quite lengthy advertised duration (when compared to their duration @.050). For example, Naz said that he thinks that he would have liked .220@.050 better than the .204/.214 of the FR500s. Well, my cams have .220@.050 but have about the same advertised duration as the FR500 cams, mine are 255/253 and the FR500s are 255/258. The major difference is in the lobe centers. The FR500 lobe centers are at 109 (for both the intake and exhaust). This tight lobe center combined with the long advertised duration makes the overlap 38deg which is more than enough...as shown by how much power he makes. My cams have a 112 lobe center with the intake at 112 and an overlap of only 30 deg. Longer duration cams would have much more overlap if the lsa was kept at 109 so they would have to be opened up to say 114 or more to keep the overlap manageable (only if driveability is a concern. If not, the lower rpm power would be reduced and the peak power rpm would be so high that it would be unusable. </p><p></p><p>The FR500 cams are about the most efficient cams for a 4.6 that you can buy.</p></blockquote><p></p>
[QUOTE="na svt, post: 4391656, member: 35346"] Why all the name calling? I ask again, what has put out more power than an FR500 cammed motor? Yes, I do have aftermarket cams and I know what works well in a 4V motor. The FR500 cams, though somewhat mild, have a lot of overlap. This is a resuly of the quite lengthy advertised duration (when compared to their duration @.050). For example, Naz said that he thinks that he would have liked .220@.050 better than the .204/.214 of the FR500s. Well, my cams have .220@.050 but have about the same advertised duration as the FR500 cams, mine are 255/253 and the FR500s are 255/258. The major difference is in the lobe centers. The FR500 lobe centers are at 109 (for both the intake and exhaust). This tight lobe center combined with the long advertised duration makes the overlap 38deg which is more than enough...as shown by how much power he makes. My cams have a 112 lobe center with the intake at 112 and an overlap of only 30 deg. Longer duration cams would have much more overlap if the lsa was kept at 109 so they would have to be opened up to say 114 or more to keep the overlap manageable (only if driveability is a concern. If not, the lower rpm power would be reduced and the peak power rpm would be so high that it would be unusable. The FR500 cams are about the most efficient cams for a 4.6 that you can buy. [/QUOTE]
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Installing cams in a DOHC 99 Cobra
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