Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Valve Float/Bouncing?

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Old Aug 18, 2007 | 06:04 PM
  #11  
67mustang302's Avatar
67mustang302
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Default RE: Valve Float/Bouncing?

Yeah, track conditions really matter. Crappy tracks will produce crappy times. And yeah, get some traction bars. If you can afford it, Competition Engineering makes some new ones for $360 for the set called Slide-A-Link, they'll make you hook on a drag strip. I know people that are running those and have cars that are running in the 8's in a 1/4, so they obviously work.
Old Aug 21, 2007 | 01:35 PM
  #12  
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opie2@aol.com
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Default RE: Valve Float/Bouncing?

Well I pulled a valve spring and measured it. It has 47 lbs of pressure at seat height and 175 lbs of pressure at open height. That is way below what I should be running.
Old Aug 21, 2007 | 01:43 PM
  #13  
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SS4LUNCH
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Default RE: Valve Float/Bouncing?

lol yeah I would say that's a problem. I remember mine pulling about that on my 289 before.
Old Aug 21, 2007 | 01:52 PM
  #14  
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Default RE: Valve Float/Bouncing?

ORIGINAL: opie2@aol.com

Well I pulled a valve spring and measured it. It has 47 lbs of pressure at seat height and 175 lbs of pressure at open height. That is way below what I should be running.
Those are not only valve springs,,, those are rev limiters..... I am surprised you saw 5,000 rpm....

I think briggs an stratton uses 50 lbs of seat pressure.....
Old Aug 21, 2007 | 05:07 PM
  #15  
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67mustang302
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Default RE: Valve Float/Bouncing?

Holy crap, that's nothing for spring pressure. Yeah, I'm suprised too that you could even get to 5,000
Old Aug 27, 2007 | 08:21 PM
  #16  
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Default RE: Valve Float/Bouncing?

I got the new valve springs in there now and it made a huge difference! It runs better at all RPM's not just high rpm. But now it can actually rev till I need to shift. Now, I just need to decide what my next project should be...Thanks for the advice everyone.
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