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Original Message
A dual plane is better at low RPM because...
By Dave Shoe - 12/17/2001 6:59:43 PM; IP 12.2.11.131
...the intake charge never has to fight with another cylinder.

In a single plane intake, whenever a cylinder starts drawing an intake charge from the manifold, it's fighting for mixture with another cylinder who's intake cycle is just ending. At low RPMs, the turbulent shock of this transition can reduce the ability of each cylinder to fill completely. As RPMs climb, the efficiency of a single plain remains relatively high, due to it's lower-resistance (more direct) path path from the carb to the combustion chamber.

Since neighboring intake cycles in a dual plane intake manifold are always on different planes, a cylinder never has to fight with another cylinder for intake charge. It can draw a fuel-air mixture without another cylinder fighting for part of it. The drawback comes at high-RPM when the resistance of the longer, bendier passages, and the more confined plenum, tend to reduce flow.

Just my opinion,
Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=10074&Reply=10074><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10074" onclick="return false;">Edelbrock RPM intake on 427?</a>&nbsp;-- <font color=#0000ff>Joshua Carroll, <i>12/16/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10074', contentMargin: 60, icon: $('anchor10074') }); </script>  Edelbrock RPM intake on 427? -- Joshua Carroll, 12/16/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10075&Reply=10074><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10075" onclick="return false;">RE: Edelbrock RPM intake on 427?</a>&nbsp;-- <font color=#0000ff>Bob, <i>12/16/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10075', contentMargin: 60, icon: $('anchor10075') }); </script>  RE: Edelbrock RPM intake on 427? -- Bob, 12/16/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10077&Reply=10074><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10077" onclick="return false;">Hey Bob, can you explain why...</a>&nbsp;-- <font color=#0000ff>Jim, <i>12/17/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10077', contentMargin: 60, icon: $('anchor10077') }); </script>  Hey Bob, can you explain why... -- Jim, 12/17/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10079&Reply=10074><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10079" onclick="return false;">RE: Hey Bob, can you explain why...</a>&nbsp;-- <font color=#0000ff>Bob, <i>12/17/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10079', contentMargin: 60, icon: $('anchor10079') }); </script>  RE: Hey Bob, can you explain why... -- Bob, 12/17/2001
 RE: Hmmm, thanks! n/m -- Jim, 12/17/2001
 Higher air velocity on a dual plane... -- Dan Davis, 12/17/2001
A dual plane is better at low RPM because... -- Dave Shoe, 12/17/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10088&Reply=10074><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10088" onclick="return false;">Another opinion</a>&nbsp;-- <font color=#0000ff>Ross, <i>12/17/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10088', contentMargin: 60, icon: $('anchor10088') }); </script>  Another opinion -- Ross, 12/17/2001
 RE:Edelbrock F427? -- Jim, 12/17/2001
 That's nice, but you missed a point! -- Rich Kutzner, 12/23/2001
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