<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:14px"><div id="yui_3_16_0_ym19_1_1482518850441_8468" dir="ltr"><span style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1482518850441_8485">" I'm pretty sure that </span><br clear="none" style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1482518850441_8486"><span style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1482518850441_8487">an intake normally opens before top dead center, so if it was </span><br clear="none" style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1482518850441_8488"><span style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1482518850441_8489">supposed to open to 0.050 lift at 20 degrees before top dead center,"</span><span></span></div><div id="yui_3_16_0_ym19_1_1482518850441_8468" dir="ltr"><span style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;"><br></span></div><div id="yui_3_16_0_ym19_1_1482518850441_8468" dir="ltr"><span style="font-family: "Helvetica Neue", "Segoe UI", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 13px;">Tony, didn't you want to say 0.500 lift?</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1482518850441_8469"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1482518850441_8474" style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 14px;" id="yui_3_16_0_ym19_1_1482518850441_8473"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1482518850441_8472"> <div dir="ltr" id="yui_3_16_0_ym19_1_1482518850441_8471"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1482518850441_8470"> <hr size="1" id="yui_3_16_0_ym19_1_1482518850441_8501"> <b><span style="font-weight:bold;">From:</span></b> Tony Drews via Fot <fot@autox.team.net><br> <b><span style="font-weight: bold;">To:</span></b> jerryvv@roadrunner.com; Duncan Charlton <duncan.charlton54@gmail.com> <br><b><span style="font-weight: bold;">Cc:</span></b> Duncan Charlton via Fot <fot@autox.team.net><br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, December 23, 2016 11:33 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Fot] Kastner F cam<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1482518850441_8580"><br>If you are putting in 4 degrees of advance, you want the valve <br clear="none">opening 4 degrees of crankshaft rotation earlier than whatever spec <br clear="none">you're following (0.010 lift or 0.050 lift or whatever). The degrees <br clear="none">are confusing because you have the "Before" and "After" degrees (BTDC <br clear="none">- Before Top Dead Center and ATDC - After Top Dead Center) - for one <br clear="none">you add the 4 degrees, for the other you subtract it. I always spend <br clear="none">about 5 minutes figuring out which way to go. I'm pretty sure that <br clear="none">an intake normally opens before top dead center, so if it was <br clear="none">supposed to open to 0.050 lift at 20 degrees before top dead center, <br clear="none">4 degrees of advance would have it opening at 24 degrees before top <br clear="none">dead center. It would also close 4 degrees earlier. If close is <br clear="none">supposed to be 50 degrees ATDC, 4 degrees early would be 46 degrees <br clear="none">ATDC (no one would close the intake that early I'm pretty sure). I <br clear="none">guess you add the advance to the "before" and subtract from the <br clear="none">"after" settings.<br clear="none"><br clear="none">When I degree a cam, I measure both the open and close events. If <br clear="none">the cam isn't ground PERFECTLY to spec, if you only measure opening <br clear="none">you may end up with more or less advance than you expected. So <br clear="none">average the open / close to get the centerline in the right spot. If <br clear="none">close is 4 degrees early when open is on spec, you really have 2 <br clear="none">degrees of advance already. I have a hard time explaining it so it's <br clear="none">clear - but it's clear in my head... :)<br clear="none"><br clear="none">Tony Drews<br clear="none"><div class="yqt4114973798" id="yqtfd98921"><br clear="none">At 08:46 AM 12/23/2016, Jerry Van Vlack via Fot wrote:<br clear="none">>Friends, can someone explain installing a cam with xx advance, <br clear="none">>somewhere I saw a reference to doing a cam installation with a 4 <br clear="none">>degree advance. Does that mean that if the valve opens at xx degrees <br clear="none">>that it should be set to open at xx minus 4 degrees and what purpose <br clear="none">>does that serve? Is this the same as using .010 or some other <br clear="none">>checking clearance. Seems that these two variables are related and <br clear="none">>one should use one or the other method but not both. Thanks, I'd <br clear="none">>like to learn more about this stuff. JVV<br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none"><a shape="rect" ymailto="mailto:fot@autox.team.net" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none"><br clear="none"><a shape="rect" href="http://www.fot-racing.com/" target="_blank">http://www.fot-racing.com</a><br clear="none"><br clear="none">Donate: <a shape="rect" href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br clear="none">Archive: <a shape="rect" href="http://www.team.net/archive" target="_blank">http://www.team.net/archive</a><br clear="none">Forums: <a shape="rect" href="http://www.team.net/forums" target="_blank">http://www.team.net/forums</a><br clear="none">Unsubscribe/Manage: <a shape="rect" href="http://autox.team.net/mailman/options/fot/kenandtweety@yahoo.com" target="_blank">http://autox.team.net/mailman/options/fot/kenandtweety@yahoo.com</a><br clear="none"><br clear="none"><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>