4.6 head question

jeremy canter

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Dec 2, 2008

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Orange County , NY

Jan 21, 2009

#1

• Jan 21, 2009

• #1

is the plug blowning out a big problem in our 4.6 heads ?
what years are more pron to it ?
is a compression ratio of 9.9.1/ >> 10/1 too high for stock heads? or is the problem just on supercharged motors ?

 

02nightmaregt

To hell with your Mustang, I want to see your HOG!

Jul 1, 2007

513

4

19

Southern Indiana

Jan 21, 2009

#2

• Jan 21, 2009

• #2

Yea its a pretty common problem. I believe its more previlent in the 99-mid 01's, but i'm not 100%. With a s/c'd application you would want a lower compression ratio than 10:1. A 9.5:1 is a better ratio. W/ nitrous a higher comp. is better but not so w/ boost.

 

jeremy canter

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Dec 2, 2008

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Orange County , NY

Jan 21, 2009

#3

• Jan 21, 2009

• #3

I'm wanting to do a 01-04 head swap on to my 96 gt but I don't want head problems with the plugs blowing out .

 

fasthippo

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Oct 22, 2008

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OC, CA

Jan 22, 2009

#4

• Jan 22, 2009

• #4

http://forums.stangnet.com/705537-how-prevent-spark-plug-blowout.html

as long as you install them correctly and dont go cheap on the plugs you should be fine.

i just finished a head swap a month or so ago and havent had any problems with the updated motorcraft plugs.

 

5spd GT

"the 5.0 owns all"

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Jan 23, 2009

#5

• Jan 23, 2009

• #5

jeremy canter said:

I'm wanting to do a 01-04 head swap on to my 96 gt but I don't want head problems with the plugs blowing out .

Click to expand...

I did the PI Headswap on my '98 ('02 parts) on my daily driver at the time and was fine for over 20k. and still going fine.

There is PI Headswap help in my signature.

 

CobraRed_96_GT

Active Member

May 20, 2006

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Jan 23, 2009

#6

• Jan 23, 2009

• #6

Or buy new castings or any used 2004 head and it wont happen at all.

 

Z

Zinc2000GT

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Aug 29, 2000

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Phoenix, AZ

Jan 23, 2009

#7

• Jan 23, 2009

• #7

I had Timeserts installed in each plug hole in my new heads. I didn't want to have to deal with a blown out plug down the road.

Of course i plan on pushing 22+psi as well.

Stock or N/A, i wouldn't worry about it too much, otherwise, it's fairly cheap insurance to have the plug holes Timecerted or go with the new castings with full threads.

 

NitroDuck

I put out on the 1st date

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Jan 25, 2009

#8

• Jan 25, 2009

• #8

Before I sold mine, I put 35k miles on my '01 heads after the headswap. Roughly 10:1 compression (no bowl work) and never a hint of blowout.

 

mogs01gt

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Jul 22, 2002

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Jan 26, 2009

#9

• Jan 26, 2009

• #9

jeremy canter said:

is the plug blowning out a big problem in our 4.6 heads ?
what years are more pron to it ?
is a compression ratio of 9.9.1/ >> 10/1 too high for stock heads? or is the problem just on supercharged motors ?

Click to expand...

Its one of those bull**** problems brought by morons who install the wrong plugs. I've been running over 11.5:1 compression for a few years now and havent had any issues.

 

crazystang25

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Jan 25, 2009

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Jan 26, 2009

#10

• Jan 26, 2009

• #10

and i would have to disagree with the idiot above me its not just the wrong plugs. mine were stockies and #4 blew out. of course mine had 104k on them. but it aint just people puttin wrong plugs in.

 

mogs01gt

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Jul 22, 2002

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Jan 26, 2009

#11

• Jan 26, 2009

• #11

crazystang25 said:

and i would have to disagree with the idiot above me its not just the wrong plugs. mine were stockies and #4 blew out. of course mine had 104k on them. but it aint just people puttin wrong plugs in.

Click to expand...

idiot above me huh??? Good job ****ing up our own car......Its morons like you not properly maintaining their vehicle that started this internet bull**** about the plugs.

 

jeremy canter

Member

Dec 2, 2008

402

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Orange County , NY

Jan 28, 2009

#12

• Jan 28, 2009

• #12

play nice boy's . I'm looking for help > not to start a war> everyone's thoughts are welcome > just be nice

 

Mustang92

SN's #1 1%er

Jun 6, 2001

6,467

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South Florida

Jan 29, 2009

#13

• Jan 29, 2009

• #13

The problem is the number of threads in the plug hole. Ford's fix in 2004 was more threads. There just isn't enough threads on the earlier heads and sometimes it's just time that weakens them, or people over tightening them or the wrong plugs...they can all contribute to causing them to come out.

Bill

 

Gearbanger 101

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Jan 29, 2009

#14

• Jan 29, 2009

• #14

crazystang25 said:

and i would have to disagree with the idiot above me its not just the wrong plugs. mine were stockies and #4 blew out. of course mine had 104k on them. but it aint just people puttin wrong plugs in.

Click to expand...

mogs01gt said:

idiot above me huh??? Good job ****ing up our own car......Its morons like you not properly maintaining their vehicle that started this internet bull**** about the plugs.

Click to expand...

Chiiiiilllll fellas.

Crazystang, watch it with tossing around the personal insuts. That stuff doesn't fly around here. Don't start fights where they don't need to be started. Mogs....no need to go bat**** over something you read on the internet. Your point was well taken without flying off at the handle.

As Mogs stated...the right plugs will go a long way towards longevity. Even though they physically fit, you can't use the old AWSF style pugs we all ran in our 302's. You need the long shank AGSF (now designated SP-XXX) with additional thread for the mod heads.

http://www.paulmachenry.com/documents/MotorcraftSparkPlugs.pdf