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RE: Timing problems - LONG!
By Gerry Proctor - 06/10/2002 7:32:30 AM; IP 207.133.188.254
It's fair to say that the vacuum advance will respond differently under load, Todd. The "fluttering" your experiencing is caused by having too much advance.

Load is a bit ambiguous since there is a great deal of difference in load for just taking off from a stop and pulling a horse trailer up an incline. From a ported vacuum source, you will show vacuum advance from the taking off from a stop and no, or very little, advance when pulling the horse trailer. Considering how vacuum advance works, you would want the advance to start upon throttle application. Anytime you are using advance, you are building cylinder pressure. More cylinder pressure means more torque. You do not want to delay your vacuum advance.

You still want to tune your ignition curve for what works best for your car and let the numbers fall where they may but, in my opinion, having your centrifugal advance all in by 2,000 rpm seems a bit too agressive for a street car. I have found that a street engine generally runs best with full centrifugal advance coming in a little later...in the 3,000 to 3,500 rpm range for a performance street tune. Even later if the engine and drivetrain are closer to stock.
Hope this helps.
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Collapse <a href=../ForumFE/reply.aspx?ID=13276&Reply=13276><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor13276" onclick="return false;">Timing problems</a>&nbsp;-- <font color=#0000ff>Todd Novak, <i>06/07/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=13276', contentMargin: 60, icon: $('anchor13276') }); </script>  Timing problems -- Todd Novak, 06/07/2002
Collapse <a href=../ForumFE/reply.aspx?ID=13277&Reply=13276><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor13277" onclick="return false;">RE: Timing problems - LONG!</a>&nbsp;-- <font color=#0000ff>Joel, <i>06/07/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=13277', contentMargin: 60, icon: $('anchor13277') }); </script>  RE: Timing problems - LONG! -- Joel, 06/07/2002
Collapse <a href=../ForumFE/reply.aspx?ID=13287&Reply=13276><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor13287" onclick="return false;">RE: Timing problems - LONG!</a>&nbsp;-- <font color=#0000ff>Todd Novak, <i>06/07/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=13287', contentMargin: 60, icon: $('anchor13287') }); </script>  RE: Timing problems - LONG! -- Todd Novak, 06/07/2002
RE: Timing problems - LONG! -- Gerry Proctor, 06/10/2002
 RE: Timing problems -- Gerry Proctor, 06/07/2002
Collapse <a href=../ForumFE/reply.aspx?ID=13279&Reply=13276><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor13279" onclick="return false;">Also remember...</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>06/07/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=13279', contentMargin: 60, icon: $('anchor13279') }); </script>  Also remember... -- Dave Shoe, 06/07/2002
 Oops! Never mind. -- Dave Shoe, 06/07/2002
Collapse <a href=../ForumFE/reply.aspx?ID=13314&Reply=13276><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor13314" onclick="return false;">RE: Timing problems</a>&nbsp;-- <font color=#0000ff>x1968x, <i>06/10/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=13314', contentMargin: 60, icon: $('anchor13314') }); </script>  RE: Timing problems -- x1968x, 06/10/2002
 RE: Timing problems -- Todd Novak, 06/10/2002
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