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Help! compression ??'s
By Robbie - 02/24/2002 8:21:12 AM; IP 216.74.205.118
I was on here a few months back with a detonation problem ,,
Here is a fast update:67 GT 500 428 PI with correct BJ BK carbs,4 speed and I want it to run good on pump gas 91 octane,,it is not a race car it is a nice original car with a great pedigree,but I don't want a lathargic slug,as it was,, I only had 29-30 degrees of total timming in it,to stop the detonation which really slowed down the car)
I was figuring compression from memory of what was in the engine At the time I was assuming the compression was at 11.7:1,,BUT,, now I have the engine apart and I CCed the heads and pistons etc etc(70 cc head,14.5 cc piston dish .005 deck height) and I come up to 10.3:1,,Is this right??
i contacted Gessford engines in nebraska and they said I wanted the compression at 9 to 9.5:1 and 36-38 degrees total timing and the car would run entirely better,,is this correct??I will buy new pistons to acheive this comp ratio if nessecary but I don't want to spend 800.00 on pistons to find I should have left the 10.3:1 pistons in it ,,,HELP I'm a small block guy and this FE is eatin my lunch
Robbie Musick
This thread, so far...
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Collapse <b>Help! compression ??'s</b>&nbsp;-- <font color=#0000ff>Robbie, <i>02/24/2002</i></font>Help! compression ??'s -- Robbie, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11617&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11617" onclick="return false;">RE: Help! compression ??'s</a>&nbsp;-- <font color=#0000ff>Bob, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11617', contentMargin: 60, icon: $('anchor11617') }); </script>  RE: Help! compression ??'s -- Bob, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11618&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11618" onclick="return false;">RE: Help! compression ??'s</a>&nbsp;-- <font color=#0000ff>Robbie, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11618', contentMargin: 60, icon: $('anchor11618') }); </script>  RE: Help! compression ??'s -- Robbie, 02/24/2002
 RE: Help! compression ??'s -- Jim, 02/24/2002
 RE: Help! compression ??'s -- Bob, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11623&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11623" onclick="return false;">Factory spec was 10-10.5 See this page...</a>&nbsp;-- <font color=#0000ff>Mr F, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11623', contentMargin: 60, icon: $('anchor11623') }); </script>  Factory spec was 10-10.5 See this page... -- Mr F, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11625&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11625" onclick="return false;">RE: Factory spec was 10-10.5 See this page...</a>&nbsp;-- <font color=#0000ff>Bob, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11625', contentMargin: 60, icon: $('anchor11625') }); </script>  RE: Factory spec was 10-10.5 See this page... -- Bob, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11627&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11627" onclick="return false;">RE: Factory spec was 10-10.5 See this page...</a>&nbsp;-- <font color=#0000ff>Robbie, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11627', contentMargin: 60, icon: $('anchor11627') }); </script>  RE: Factory spec was 10-10.5 See this page... -- Robbie, 02/24/2002
 RE: Factory spec was 10-10.5 See this page... -- Bob, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11633&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11633" onclick="return false;">10-10.5 is a workable range w/ premium fuel. [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11633', contentMargin: 60, icon: $('anchor11633') }); </script>  10-10.5 is a workable range w/ premium fuel. [n/m] -- Mr F, 02/24/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11634&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11634" onclick="return false;">RE: 10-10.5 or 11.1 w/ premium fuel.</a>&nbsp;-- <font color=#0000ff>Ray, <i>02/24/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11634', contentMargin: 60, icon: $('anchor11634') }); </script>  RE: 10-10.5 or 11.1 w/ premium fuel. -- Ray, 02/24/2002
 RE: 10-10.5 or 11.1 w/ premium fuel. -- Ray, 02/25/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11641&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11641" onclick="return false;">RE: 10-10.5 is a workable ,also PCV?</a>&nbsp;-- <font color=#0000ff>Robbie, <i>02/25/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11641', contentMargin: 60, icon: $('anchor11641') }); </script>  RE: 10-10.5 is a workable ,also PCV? -- Robbie, 02/25/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11647&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11647" onclick="return false;">OK..you did not mention it...</a>&nbsp;-- <font color=#0000ff>kevin, <i>02/25/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11647', contentMargin: 60, icon: $('anchor11647') }); </script>  OK..you did not mention it... -- kevin, 02/25/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11668&Reply=11616><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11668" onclick="return false;">"Platinum is a no-no"...please elaborate...</a>&nbsp;-- <font color=#0000ff>Dan Davis, <i>02/25/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11668', contentMargin: 60, icon: $('anchor11668') }); </script>  "Platinum is a no-no"...please elaborate... -- Dan Davis, 02/25/2002
 RE: "Platinum is a no-no"...please elaborate... -- kevin, 02/26/2002
 RE: 10-10.5 is a workable ,also PCV? -- Ray, 02/25/2002
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