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RE: 67 shelby ignition pinging
By salid - 01/24/2001 11:57:37 PM; IP 206.206.37.47
You said you shaved the block and the heads, did you shave the intake too? See Christs FE book for details on whether you should also shave the intake. Page 75 talks about milling the block. Page 101 talks about milling the heads. Page 102 has a table discribing milling amountsfor the intake sides and bottom based on amount milled from heads. Having said this, I will tell you that after milling the heads (on my 68 Shelby) .010 and installing a PI intake I developed a noticable ping on hard acceleration after about 1500 mile on the rebuild. It also had a rough idle and low vacuum. My problem turned out to be a leak between the intake and the head. This was allowing oil to be pulled into 4 cylinders. This drasticly reduces the octane resulting in ping. This condition can be confirmed by noticeable oil consumption and on disassembly, the presence of oil into the intake runner to the valve. I replaced my gaskets with the blue silicone embossed FelPro gaskets and the problem went away. Alluminum intakes seem to be particularly prone to this problem since they expand at a different rate than iron. If this problem recurrs, I will mill my intake.
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Collapse <a href=../ForumFE/reply.aspx?ID=4281&Reply=4281><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor4281" onclick="return false;">67 shelby ignition pinging</a>&nbsp;-- <font color=#0000ff>robbie, <i>01/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=4281', contentMargin: 60, icon: $('anchor4281') }); </script>  67 shelby ignition pinging -- robbie, 01/21/2001
 RE: 67 shelby ignition pinging -- robbie, 01/21/2001
Collapse <a href=../ForumFE/reply.aspx?ID=4305&Reply=4281><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor4305" onclick="return false;">RE: 67 shelby ignition pinging</a>&nbsp;-- <font color=#0000ff>BOB HOPKINS, <i>01/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=4305', contentMargin: 60, icon: $('anchor4305') }); </script>  RE: 67 shelby ignition pinging -- BOB HOPKINS, 01/23/2001
 retard timing until it quits... -- Troy, 01/23/2001
 RE: 67 shelby ignition pinging -- BOB HOPKINS, 01/24/2001
Collapse <a href=../ForumFE/reply.aspx?ID=4306&Reply=4281><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor4306" onclick="return false;">RE: 67 shelby ignition pinging</a>&nbsp;-- <font color=#0000ff>Morgan, <i>01/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=4306', contentMargin: 60, icon: $('anchor4306') }); </script>  RE: 67 shelby ignition pinging -- Morgan, 01/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=4309&Reply=4281><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor4309" onclick="return false;">RE: 67 shelby ignition pinging</a>&nbsp;-- <font color=#0000ff>robbie, <i>01/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=4309', contentMargin: 60, icon: $('anchor4309') }); </script>  RE: 67 shelby ignition pinging -- robbie, 01/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=4313&Reply=4281><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor4313" onclick="return false;">RE: 67 shelby ignition pinging</a>&nbsp;-- <font color=#0000ff>Mike, <i>01/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=4313', contentMargin: 60, icon: $('anchor4313') }); </script>  RE: 67 shelby ignition pinging -- Mike, 01/23/2001
Collapse <b>RE: 67 shelby ignition pinging</b>&nbsp;-- <font color=#0000ff>salid, <i>01/24/2001</i></font>RE: 67 shelby ignition pinging -- salid, 01/24/2001
 RE: 67 shelby ignition pinging -- robbie, 01/28/2001
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