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RE: Good Subject...What about triple cuts too? n/m
By Bob - 12/21/2001 12:08:02 AM; IP 65.80.202.58
I didn't do the testing but on this or another FE Forum this topic was discussed and several Edelbrock FE heads with 30 degree intake seats were changed to 45 degree seats and the consensus was that for cams with more that .550 lift the 45 degree seat was best. The difference was noticed at lifts of .400 and greater but the total time that the valve was open that much was not very long if the total lift was less than .550.

The reason why the 30 degree seat works better at low lift was not really discussed. I think that there are two reasons. The first is that the effective valve opening is slightly higher with the 30 degree seat so with a lower total lift (and duration) this makes a bit of a difference. And the second reason that the airflow drops at higher lifts for the 30 degree seat is due to the air flow having to make a bit more of a turn for the 30 degree seat compared to the 45 degree seat.

Double and triple back cuts were used by some. I would think that the lift/duration and seat angle could be matched for optimal flow. The problem is that you would have to do a lot of testing to find the optimal seat angle for any give cam. Then there is the question of how it actually works on a running engine so a second set of tests would have to be made to confirm/validate the head airflow results.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=10119&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10119" onclick="return false;">What is the major componet to making power</a>&nbsp;-- <font color=#0000ff>mikeb, <i>12/19/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10119', contentMargin: 60, icon: $('anchor10119') }); </script>  What is the major componet to making power -- mikeb, 12/19/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10120&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10120" onclick="return false;">Size isn't all that matters</a>&nbsp;-- <font color=#0000ff>Dan Davis, <i>12/19/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10120', contentMargin: 60, icon: $('anchor10120') }); </script>  Size isn't all that matters -- Dan Davis, 12/19/2001
 RE: Size isn't all that matters -- mikeb, 12/19/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10127&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10127" onclick="return false;">Bore us Dan,,,,,PLEASE n/m</a>&nbsp;-- <font color=#0000ff>Jim, <i>12/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10127', contentMargin: 60, icon: $('anchor10127') }); </script>  Bore us Dan,,,,,PLEASE n/m -- Jim, 12/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10129&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10129" onclick="return false;">OK, what subject? [n//m]</a>&nbsp;-- <font color=#0000ff>Dan Davis, <i>12/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10129', contentMargin: 60, icon: $('anchor10129') }); </script>  OK, what subject? [n//m] -- Dan Davis, 12/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10131&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10131" onclick="return false;">RE: OK, what subject? [n//m]</a>&nbsp;-- <font color=#0000ff>Bob, <i>12/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10131', contentMargin: 60, icon: $('anchor10131') }); </script>  RE: OK, what subject? [n//m] -- Bob, 12/20/2001
 High lift / low lift air flow -- Travis Miller, 12/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10134&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10134" onclick="return false;">Good Subject...What about triple cuts too? n/m</a>&nbsp;-- <font color=#0000ff>Jim, <i>12/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10134', contentMargin: 60, icon: $('anchor10134') }); </script>  Good Subject...What about triple cuts too? n/m -- Jim, 12/20/2001
Collapse <b>RE: Good Subject...What about triple cuts too? n/m</b>&nbsp;-- <font color=#0000ff>Bob, <i>12/21/2001</i></font>RE: Good Subject...What about triple cuts too? n/m -- Bob, 12/21/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10174&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10174" onclick="return false;">RE: Good Subject...What about triple cuts too? n/m</a>&nbsp;-- <font color=#0000ff>Mario428, <i>12/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10174', contentMargin: 60, icon: $('anchor10174') }); </script>  RE: Good Subject...What about triple cuts too? n/m -- Mario428, 12/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=10184&Reply=10119><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10184" onclick="return false;">RE: Good Subject...What about triple cuts too? n/m</a>&nbsp;-- <font color=#0000ff>Bob, <i>12/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10184', contentMargin: 60, icon: $('anchor10184') }); </script>  RE: Good Subject...What about triple cuts too? n/m -- Bob, 12/23/2001
 RE: Good Subject...What about triple cuts too? n/m -- Mario428, 12/24/2001
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