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Twingo Technical & Detailing Information
Projects / Progress Threads
RS160 - Twingo Gordini #159
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<blockquote data-quote="singlespeed" data-source="post: 132638" data-attributes="member: 264"><p>The stage two cams for the 197/200 takes 4degree retard on the exhaust cam, which after lots of testing was eventualy found to be the ideal point for them... I think the setting slot is now ground with the 4 degree offset built in (not 100%) :? </p><p></p><p>As a new untested profile, any idle problems from larger inlet /exhaust valve opening overlap were not known. To reduce the overlap, retarding the exhaust cam a bit should help... Obviously theres a risk of going too far and getting valve to piston contact if your not carefull and they will still need to allow for some working clearance. Hence they were adjusted bit by bit untill the point where the idle was usable (if not perfect), without affecting the peak power or causing piston/valve contact .</p></blockquote><p></p>
[QUOTE="singlespeed, post: 132638, member: 264"] The stage two cams for the 197/200 takes 4degree retard on the exhaust cam, which after lots of testing was eventualy found to be the ideal point for them... I think the setting slot is now ground with the 4 degree offset built in (not 100%) :? As a new untested profile, any idle problems from larger inlet /exhaust valve opening overlap were not known. To reduce the overlap, retarding the exhaust cam a bit should help... Obviously theres a risk of going too far and getting valve to piston contact if your not carefull and they will still need to allow for some working clearance. Hence they were adjusted bit by bit untill the point where the idle was usable (if not perfect), without affecting the peak power or causing piston/valve contact . [/QUOTE]
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Twingo Technical & Detailing Information
Projects / Progress Threads
RS160 - Twingo Gordini #159
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