How do you know if you have floating valves?

95Vert

New Member

Aug 19, 2004

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North Mexico (deep south Texas)

Apr 13, 2006

#1

• Apr 13, 2006

• #1

I was told that my valves may be floating cause I just installed them and didn't pressurize... pressur...pleasus..them, or something like that. Is it true? If so, how do I find out? I mean, a guy who knows about stangs helped me install them. We filled the cylinder with air and even turned the engine to block the valve with the piston. After that, we installed new 1.7s crane rockers, and that was it. Should I be worried?

 

Zero Signal

Active Member

Feb 24, 2003

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Tucson, AZ

Apr 13, 2006

#2

• Apr 13, 2006

• #2

How you install them has nothing to do with valve float. Valve float happens when you over-rev the spring and the lifter hops off the cam lobe thus the valve stays open longer (floats)

 

95Vert

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Aug 19, 2004

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North Mexico (deep south Texas)

Apr 13, 2006

#3

• Apr 13, 2006

• #3

Ok, but how do you know. Do you just feel it or what? Cause my car revs right on to 6500rpm with no problem. The first time I took it out after the tranny swap, I didn't notice right away, but I shifted right around 6800rpm and the car got there in no time. I know it's not safe and will place a rev limiter at 6400rpm.

 

legalize420

Active Member

May 21, 2005

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South Florida

Apr 13, 2006

#4

• Apr 13, 2006

• #4

95Vert said:

I was told that my valves MAY be floating

Click to expand...

does the car drive right? might not be a good idea to shift that high but if there are not symptoms why worry about it.

 

nmcgrawj

Advanced Member

Sep 28, 2003

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Indianapolis, IN

Apr 13, 2006

#5

• Apr 13, 2006

• #5

Well it loses power....i have never felt it but it feels like it hits a brick wall or a rev limiter im pretty sure.

 

Zero Signal

Active Member

Feb 24, 2003

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Tucson, AZ

Apr 13, 2006

#6

• Apr 13, 2006

• #6

Yeah don't rev that high. Just shift at 6k unless you are VERY confident in your valve train.

 

nmcgrawj

Advanced Member

Sep 28, 2003

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68

Indianapolis, IN

Apr 13, 2006

#7

• Apr 13, 2006

• #7

Can the stock rods even handle 6800? I thought 6500 was pushing it even when just racing and not daily.

 

95Vert

New Member

Aug 19, 2004

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North Mexico (deep south Texas)

Apr 14, 2006

#8

• Apr 14, 2006

• #8

I know guys. I didn't realized my rpm went up that high so fast. The tranny swap just threw me off. The car spun the tires so quick that by the time I turned to look at the rpms, it was already at 6800. I've haven't let go up that high since then. I need to go to the dyno to know where I need to shift. But yeah, a rev limiter at 6400 is coming.

 

mricci

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Aug 17, 2003

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Massachusetts

Apr 14, 2006

#9

• Apr 14, 2006

• #9

How high is the stock rev limiter on our cars?

 

SorsCode

20+ Year Stangneter

Jun 10, 2003

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St. Louis, MO

Apr 15, 2006

#10

• Apr 15, 2006

• #10

mricci said:

How high is the stock rev limiter on our cars?

Click to expand...

7000-7200

 

blksn955.o

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Mar 15, 2002

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st.louis mo 314

Apr 15, 2006

#11

• Apr 15, 2006

• #11

I have always heard 6250 in the gt's , chances are the tach of not accurate at that point though, or a tune/tuner changed it.

 

SorsCode

20+ Year Stangneter

Jun 10, 2003

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St. Louis, MO

Apr 17, 2006

#12

• Apr 17, 2006

• #12

6250 is older GT'. 87-93 A9L's. Since you got a tweecer you can look it up.