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I think I'm having valve float help!

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Old Jun 28, 2012 | 05:39 PM
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Default I think I'm having valve float help!

I have a forged bottom end with 232/236 114lsa and .615 lift cam with patriot ls6 heads when my car got to 5800 Rpms on the dyno it isntantly stoped making power.
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Old Jun 28, 2012 | 06:30 PM
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Describe the rest of the valvetrain - i.e. what valve springs, rockers, etc.
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Old Jun 28, 2012 | 07:47 PM
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It's got ls7 lifters comp gold 1.7 rockers hardened pushrods and it has dual spring from
The previous owner if I had to guess there probably patriot (patriot heads) it's the only used thing I used when I built this motor besides the crank . I'll post the dyno graph in a little basically climbs to 400hp as Soon as it hits 5800rpm it levels out and the line is al squiggly lol
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Old Jun 28, 2012 | 07:55 PM
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Easiest first step would be to switch back to stock rockers. After that I'd pull a couple springs and check pressures
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Old Jun 28, 2012 | 08:10 PM
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why would i switch back to stock rockers? I had stock ones on there when it was dyno. then i put roller rockers on because the bearings were going and its exactly the same just quieter
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Old Jun 28, 2012 | 08:35 PM
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Didn't know you had the float on stockers. Aftermarket rockers are known to be heavy over the nose which will induce float. Guess its time to pull some springs
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Old Jun 28, 2012 | 09:44 PM
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what new springs would you guys recommend this cam should make power to 6500 rpms and with the forged bottom end i wanna take it that high .
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Old Jun 28, 2012 | 09:47 PM
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Call PAC and give them your cam specs. They can get you a quality spring with the pressure you need
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Old Jun 28, 2012 | 11:51 PM
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Springs or lifters. Maybe a combo of both.
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Old Jun 29, 2012 | 09:14 AM
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The lifters are like new only have maybe 200 miles on them
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Old Jun 29, 2012 | 10:15 AM
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Fuel pressure at WOT? Injector size?
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Old Jun 29, 2012 | 10:19 AM
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A very erratic power band is valve float 90% of the time.
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Old Jun 29, 2012 | 10:39 AM
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It has 30lb injectors , what does erratic power band mean ?
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Old Jun 29, 2012 | 11:01 AM
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Your power band line on the dyno gets very jagged just befor you lose your power.
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Old Jun 29, 2012 | 02:15 PM
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I'm guessing you need new springs, AND shimmed to within .050 of coil bind.
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Old Jun 29, 2012 | 02:39 PM
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I think I'm just gunna get some new springs the valvtrain seems a tiny bit noisy also
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Old Jun 29, 2012 | 04:55 PM
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that is the dyne 5 days before i switched to turbo 400
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Old Jun 29, 2012 | 11:27 PM
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Posted dyno graph please tell if it looks ok ?
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Old Jul 1, 2012 | 02:02 PM
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Originally Posted by dr_whigham
I'm guessing you need new springs, AND shimmed to within .050 of coil bind.
This. I was going to ask what your spring height is set at.
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Old Jul 1, 2012 | 02:03 PM
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Normally when you have valve float there's a dip at the top end and then it nose dives off. It doesn't appear that yours is doing that. However your tq curve seems to be a little wavy. The local machine shop set my heads up wrong and I had horrible valve float. My dyno graph was really jagged and then dropped off.
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