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<blockquote data-quote="52merc" data-source="post: 15958650" data-attributes="member: 197"><p>Compliance to SFI 18.1 has to do with the materials used in construction and the ability of the damper to pass an endurance test of 1 h at 12,500 to 13,500 rev/min. It has nothing to do with the effectiveness of the damper to reduce engine vibrations. </p><p></p><p>I just finished reading an abundance of posts on this and other sites. Like most subjects, there are a lot of opinions, but no clear consensus on whether UDPs are worth it or not. Many of the posts strongly warn against the Steeda product, yet there are about as many that claim many miles of trouble free operation. I believe that many of the Steeda related engine failures where early units that may have had some QC issues.</p><p></p><p>I think if I were to go that route, I'd go with an ATI 918041 harmonic damper which is 15% underdrive and pair that with a March 1172-08 short water pump pulley or 1152-08 long water pump pulley and 113-08 alternator pulley. This is 6-rib which is all that is needed for N/A. I could not find a single post where someone was not recommending them.</p></blockquote><p></p>
[QUOTE="52merc, post: 15958650, member: 197"] Compliance to SFI 18.1 has to do with the materials used in construction and the ability of the damper to pass an endurance test of 1 h at 12,500 to 13,500 rev/min. It has nothing to do with the effectiveness of the damper to reduce engine vibrations. I just finished reading an abundance of posts on this and other sites. Like most subjects, there are a lot of opinions, but no clear consensus on whether UDPs are worth it or not. Many of the posts strongly warn against the Steeda product, yet there are about as many that claim many miles of trouble free operation. I believe that many of the Steeda related engine failures where early units that may have had some QC issues. I think if I were to go that route, I'd go with an ATI 918041 harmonic damper which is 15% underdrive and pair that with a March 1172-08 short water pump pulley or 1152-08 long water pump pulley and 113-08 alternator pulley. This is 6-rib which is all that is needed for N/A. I could not find a single post where someone was not recommending them. [/QUOTE]
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