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Author
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Topic: Am I experiencing a Valve Float
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twisted54
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Member # 1981
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posted
 
 
My car hits a wall at 5400 rpms. I thought it was possible the VSS. I resolve the speedo issue and it didn't help. I thought it may be the chip but I had the rev and speed limiters raised on them by Byron already who too says there's nothing wrong with my calibration.
I'm getting a compression and leak down test tomorrow. Could be a Valve Float problem???
I have a Lunati cam (L51014) and Twisted Wedge heads that have been on the car for 2years now.
My rwhp numbers from 10/11 seemed pretty low to me at 239.
If it is a Valve problem, how hard are the spring to replace and how much does something like that usually cost on a 94 GT?
Thanks,
Tony
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2013 Black on Black 5.0 with Boost N Things - CORN FED 🌽
Posts: 3422 | From: ebay | Registered: Oct 2002
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1SLOWLX
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Member # 558
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posted
I think I was at the dyno the same day with you. Man that is really low numbers. 93 pony with heathers car just put out 300 to the wheels. You are missing about 50rwhp good luck finding it. I am on the look out for he 30-40 mine is missing and I will soon find it ![[Big Grin]](biggrin.gif)
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Built Tuff with your stuff ;)
Posts: 5231 | From: bay area | Registered: Nov 2001
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twisted54
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Member # 1981
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posted
Yep that was me...your car is pretty sweet.
Hopefully I'll get some good news today about were my missing hp could be. Byron actually got it up to 249 at one point but the car had idle problems and had to lean it out which brought it down to 10hp
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2013 Black on Black 5.0 with Boost N Things - CORN FED 🌽
Posts: 3422 | From: ebay | Registered: Oct 2002
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1SLOWLX
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Member # 558
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posted
good luck man I hope everything goes well with that. I want my extra power and I will find it or the combo will have to change a little
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Built Tuff with your stuff ;)
Posts: 5231 | From: bay area | Registered: Nov 2001
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66 AC COBRA
Nitrous King
Member # 904
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posted
quote:
Originally posted by twstd50:
My car hits a wall at 5400 rpms. I thought it was possible the VSS. I resolve the speedo issue and it didn't help. I thought it may be the chip but I had the rev and speed limiters raised on them by Byron already who too says there's nothing wrong with my calibration.
I'm getting a compression and leak down test tomorrow. Could be a Valve Float problem???
I have a Lunati cam (L51014) and Twisted Wedge heads that have been on the car for 2years now.
My rwhp numbers from 10/11 seemed pretty low to me at 239.
If it is a Valve problem, how hard are the spring to replace and how much does something like that usually cost on a 94 GT?
Thanks,
Tony
yeah u have more sproblems than just valve springs, post the results of the compression and lrak down, i think those will be a little on the low side, how many miles are on ur shortblock anyway
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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Fast472Mach1
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Member # 2559
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posted
I had the same thing happen because the valvesprings could'nt handle my old cam and it was'nt very large. You might want to check into that theory since mine had maybe 500 miles on them and were already down to 60lbs. of pressure. Too much longer and I'm sure it would've dropped a valve or 3.
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11.7@116 1.7 60ft. N/A
11.4@124 1.9 60ft. 100NX
Posts: 639 | From: Laguna West | Registered: Mar 2003
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twisted54
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Member # 1981
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posted
I've got 112k on the short block...
The car still feels like it's pulling strong but then just falls flat on it's face.
I couldn't do the tests today but will try tomorrow at a shop near my work.
Thanks guys
![[patriot]](graemlins/patriot.gif)
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2013 Black on Black 5.0 with Boost N Things - CORN FED 🌽
Posts: 3422 | From: ebay | Registered: Oct 2002
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kwikrob
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Member # 835
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posted
You may have multiple issues but I'm sure the springs are shot. I replace mine every one to two years depending on how much racing I do and it looks like you drive your car everyday.
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Slowest car on this board!
Posts: 382 | From: Bay Area | Registered: Feb 2002
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twisted54
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Member # 1981
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posted
If the springs were shot, would they be making a certain noise?
Mine aren't making any kinda noise.
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2013 Black on Black 5.0 with Boost N Things - CORN FED 🌽
Posts: 3422 | From: ebay | Registered: Oct 2002
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89Rodknocker
CAFords OG
Member # 2951
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posted
The noise isn't that noticable but like you explain it will acause your call to looes power in the upper ranges when they start to go. The engine will get a little louder and the car will not want to pull past that rpm at all. Sounds like weak spring associated with rebuild time. Good luck, I dropped a valve and still haven't recovered.
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89 lx (stolen and stripped)
94 gt runner (sold)
89 lx Stock(sold)
86 gt T-trim (sold)
73 Camaro BBC
01 5.0 Explorer limited Borlas (sold)
Posts: 2488 | From: Bay Area | Registered: Jun 2003
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twisted54
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Member # 1981
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posted
JohnB helped me do a compression today (thanks John)...
Right off the bat, he found that the 1 cylinder was dead. Cyclinder 2 was at 140. We stopped there.
I guess it's time to buy a new short block. ![[burnout]](graemlins/burnout.gif)
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2013 Black on Black 5.0 with Boost N Things - CORN FED 🌽
Posts: 3422 | From: ebay | Registered: Oct 2002
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JohnB
Tech Moderator
Member # 969
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posted
Not a problem Tony, thanks for hooking me up with a hood!
Next I would do a leak-down, hopefully you just have a weak spring/bent valve and it's not the shortblock (unless you just wanna go with a stroker and call it a day! ![[Wink]](wink.gif) )
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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twisted54
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Member # 1981
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posted
I think I'll go for the stroker...
I'm actually kinda excited about it now. I'll prolly get in January. I call you to see if you can put it together for me when the time comes.
Thanks again.
Tony
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2013 Black on Black 5.0 with Boost N Things - CORN FED 🌽
Posts: 3422 | From: ebay | Registered: Oct 2002
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season'd 88
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Member # 169
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posted
Turns out i was having a valve float issue with mine as evidendenced buy yesterdays work. Shaun aka. 93pony, was kind enough to do a spring swap on my car because he and others thought i may have had an issue there. Findings..nearly every shim was worn completely through and had to whale on the exhaust side to get the things free. I gotta say, i really didnt expect this being as i had a comp k-kit that included matching springs and expected them to be fine. This set up had 5 to 10k miles at the most..Thanks again Shaun.
Posts: 1383 | Registered: Feb 2001
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93PONY
Mr. Valve Events
Member # 60
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posted
quote:
Originally posted by season'd 88:
Turns out i was having a valve float issue with mine as evidendenced buy yesterdays work. Shaun aka. 93pony, was kind enough to do a spring swap on my car because he and others thought i may have had an issue there. Findings..nearly every shim was worn completely through and had to whale on the exhaust side to get the things free. I gotta say, i really didnt expect this being as i had a comp k-kit that included matching springs and expected them to be fine. This set up had 5 to 10k miles at the most..Thanks again Shaun.
My pleasure bud.
I'm glad we got that issue solved....now you can run as big of a cam as you like! How about a 252/250 112LSA using Pure street lobes? ![[Eek!]](eek.gif)
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000
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1989lx5.0
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Member # 3699
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posted
i have a custom ground roller .720 int / .720 ext -- 264 duration at .50 lift for sale that should be big enough
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1979 pace car
1985 svo
www.californiafords.com the better calfords
Posts: 552 | From: near fresno | Registered: Oct 2003
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93PONY
Mr. Valve Events
Member # 60
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posted
quote:
Originally posted by 1989lx5.0:
i have a custom ground roller .720 int / .720 ext -- 264 duration at .50 lift for sale that should be big enough
Too bad I didn't put solid-roller springs in that thing!
Max those springs can take is .650 lift safely with the most aggressive hydraulics made.
Spring pressure is only 145lbs at 1.800 & 425lbs at 1.200.
That's just a little shy of the 500lbs+ needed for a mild solid roller. ![[Smile]](smile.gif)
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000
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