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Original Message
Still looking for theory on advance timing.
By Walker - 06/03/2004 2:51:18 PM; IP 216.159.232.26
Thanks for your answers, but I guess I'm looking for the underlying reasons for an advance curve being what it is for a particular engine.

No manufacturer involved here. All aftermarket efi/DIS.

Mine is an FE, with 10:6 compression...flat top pistons, hydraulic roller cam (small Crane), 3.9 stroke with 6.7" rods, port injection. Is there someplace, or someone, I could go to to get an explanation of why my engine is happy at 18 degrees initial (it was happy at 24 degrees initial, but for emissions reasons I backed it down). This same source should then be able to answer my questions regarding cold-running advance needs as well. Also, at 24 degrees initial, throttle response was, believe it, too good. Too much chirping no matter how featherweight the throttle foot was.

Anyway, taking things to extremes, a cold engine likes a lot of advance to help burn the cold not-so-well-mixed air-gas mixture, so would it help it burn, on startup, if I made startup advance 30? 40? which I could easily do in the coolant or MAT sensor tables. What determines what's a ridiculous number?

Thanks again
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=21694&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21694" onclick="return false;">More questions on timing...not answered below</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/02/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21694', contentMargin: 60, icon: $('anchor21694') }); </script>  More questions on timing...not answered below -- Walker, 06/02/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21698&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21698" onclick="return false;">RE: More questions on timing...not answered below</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21698', contentMargin: 60, icon: $('anchor21698') }); </script>  RE: More questions on timing...not answered below -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21700&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21700" onclick="return false;">Why: it's DIS, so 'vacuum advance' is now MAP adv</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21700', contentMargin: 60, icon: $('anchor21700') }); </script>  Why: it's DIS, so 'vacuum advance' is now MAP adv -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21701&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21701" onclick="return false;">RE: Why: it's DIS, so 'vacuum advance' is now MAP adv</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21701', contentMargin: 60, icon: $('anchor21701') }); </script>  RE: Why: it's DIS, so 'vacuum advance' is now MAP adv -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21702&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21702" onclick="return false;">But at STARTUP? need some explanation/theory</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21702', contentMargin: 60, icon: $('anchor21702') }); </script>  But at STARTUP? need some explanation/theory -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21703&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21703" onclick="return false;">RE: Now it gets complicated.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21703', contentMargin: 60, icon: $('anchor21703') }); </script>  RE: Now it gets complicated. -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21704&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21704" onclick="return false;">I thought RETARDING the timing raised temp's</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21704', contentMargin: 60, icon: $('anchor21704') }); </script>  I thought RETARDING the timing raised temp's -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21705&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21705" onclick="return false;">RE: We're working many different things.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21705', contentMargin: 60, icon: $('anchor21705') }); </script>  RE: We're working many different things. -- Gerry Proctor, 06/03/2004
Collapse <b>Still looking for theory on advance timing.</b>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font>Still looking for theory on advance timing. -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21712&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21712" onclick="return false;">RE: Still looking for theory on advance timing.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/04/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21712', contentMargin: 60, icon: $('anchor21712') }); </script>  RE: Still looking for theory on advance timing. -- Gerry Proctor, 06/04/2004
 I was surprising myself every new cold day... -- Walker, 06/04/2004
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