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RE: bad cam?
By Mike McQuesten - 03/04/2002 6:50:36 PM; IP 206.193.0.124
Based on the specs you've provided,280 duration/514 lift, that cam doesn't seem like too much for your combination. What was is the duration at .050 of this Crane? You have the cam specs card/sheet, right? That is a much better spec to judge the duration of the camshaft vs. the advertised figure(s).

Yes, 3.00 gearing isn't the best ratio for what your needs appear to be but I think your lack of low end power may be a symptom of something other than high gearing. Especially if it's as doggy as you say. You've indicated that the before 390 ran well. That's with the same 3.00 gearing I'm assuming.

Mac's recommendation of 3.50 gears is very sound advice. But I think you need to run a series of tests on your ignition system and fuel system before you make the rear gear switch. It has to get back to where this new 390 feels at least as good as the old 390.

It would be helpful to know what you mean by "its a slug up to 40 mph then it comes alive really good". Provide us some specifics as to slugishness and really good.....things like RPM range or limit with this cam. What distriutor/ignition work did you do or have done?

I think you'll get lots of good advice here if you provide just a little more information.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=11814&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11814" onclick="return false;">bad cam?</a>&nbsp;-- <font color=#0000ff>e smith, <i>03/04/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11814', contentMargin: 60, icon: $('anchor11814') }); </script>  bad cam? -- e smith, 03/04/2002
 RE: bad cam? -- Mac, 03/04/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11816&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11816" onclick="return false;">RE: bad cam?</a>&nbsp;-- <font color=#0000ff>Ray, <i>03/04/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11816', contentMargin: 60, icon: $('anchor11816') }); </script>  RE: bad cam? -- Ray, 03/04/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11818&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11818" onclick="return false;">RE: bad cam?</a>&nbsp;-- <font color=#0000ff>e smith, <i>03/04/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11818', contentMargin: 60, icon: $('anchor11818') }); </script>  RE: bad cam? -- e smith, 03/04/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11821&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11821" onclick="return false;">Re: 280 @. 050!.</a>&nbsp;-- <font color=#0000ff>Mike McQuesten, <i>03/04/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11821', contentMargin: 60, icon: $('anchor11821') }); </script>  Re: 280 @. 050!. -- Mike McQuesten, 03/04/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11825&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11825" onclick="return false;">RE: Re: 280 @. 050!.</a>&nbsp;-- <font color=#0000ff>e smith, <i>03/05/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11825', contentMargin: 60, icon: $('anchor11825') }); </script>  RE: Re: 280 @. 050!. -- e smith, 03/05/2002
 RE: Re: 280 @. 050!. -- Mike McQuesten, 03/05/2002
Collapse <b>RE: bad cam?</b>&nbsp;-- <font color=#0000ff>Mike McQuesten, <i>03/04/2002</i></font>RE: bad cam? -- Mike McQuesten, 03/04/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11819&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11819" onclick="return false;">RE: bad cam?</a>&nbsp;-- <font color=#0000ff>e smith, <i>03/04/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11819', contentMargin: 60, icon: $('anchor11819') }); </script>  RE: bad cam? -- e smith, 03/04/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11823&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11823" onclick="return false;">RE: bad cam?</a>&nbsp;-- <font color=#0000ff>scott 71 f-100, <i>03/05/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11823', contentMargin: 60, icon: $('anchor11823') }); </script>  RE: bad cam? -- scott 71 f-100, 03/05/2002
 RE: bad cam? -- Barry B, 03/05/2002
Collapse <a href=../ForumFE/reply.aspx?ID=11834&Reply=11814><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor11834" onclick="return false;">I have .514 cam with 223 @ .050..</a>&nbsp;-- <font color=#0000ff>James, <i>03/05/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=11834', contentMargin: 60, icon: $('anchor11834') }); </script>  I have .514 cam with 223 @ .050.. -- James, 03/05/2002
 RE: There you go.... -- Mike McQuesten, 03/05/2002
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