compression test results

screamin gt

5 Year Member

Apr 9, 2007

393

6

28

central CT

Apr 11, 2007

#1

• Apr 11, 2007

• #1

only checked 5,6,7, and 8 cuz thats all I needed to, but anyway I got 150 everywhere except #8 which is where I thought the noise was coming from.

#8 read 120-125, checked them all a few times to make sure.

now the book says to squirt some oil down that plug hole and re-test. still no difference.

so book says that confirms the problem is NOT the piston rings at least which basically points the finger at the valve train, warped, bent or cracked valve and/or worn cam/head

gotta get it apart now but worst case you can score a brand new complete head off ebay for about $400 so I guess I'll find out which way will be cheaper.

thanks for the help guys!! :SNSign: rocks

and for anyone that hasn't done a compression test and needs to, its quite easy and can do a good job of leading you in the right direction

btw, this is stemming from this thread...

http://forums.stangnet.com/showthread.php?t=695107

 

M

Muscle99

New Member

Mar 31, 2007

48

0

0

Apr 11, 2007

#2

• Apr 11, 2007

• #2

Good luck man im taking mine in on monday to get a compression test for my engine rattle.

 

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Muscle99

New Member

Mar 31, 2007

48

0

0

Apr 11, 2007

#3

• Apr 11, 2007

• #3

Just listend to your clip and your noise is a lot louder then mine is. Mine only comes about at 2k RPM. And after the car is warmer its not nearly as loud. I cant hear it at idle. Does your sound like its coming from the back of the engine?

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Apr 11, 2007

#4

• Apr 11, 2007

• #4

Your going to tear your motor down for that? That cyclinder should still fire until around 60#s.
I would keep driving it lol....but thats just me. Doesnt seem bad enough to justify.

oh and how many miles? and what noise are you talking about?

 

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Muscle99

New Member

Mar 31, 2007

48

0

0

Apr 11, 2007

#5

• Apr 11, 2007

• #5

Find his old post and listen to his sound clip. You will retract your statement to drive it after u hear the noise its making.

 

Mike97gt

it doe snot

Founding Member

Jan 26, 1999

10,633

7

89

the people's republic of massachusetts

Apr 11, 2007

#6

• Apr 11, 2007

• #6

Are you burning any oil? check the valve guide on the low cylinder.

 

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modmonster

New Member

Mar 30, 2005

43

0

0

Apr 12, 2007

#7

• Apr 12, 2007

• #7

I thought so bud. It seems #8 is common. It shouldnt be to bad and if you want any advise I have had to fix the exact same problem. You will spend more in gaskets provided the valves in that cylinder is all you have to replace. I will start my car tomm for the first time with the stage 2 heads and cams so I cant wait. Good luck bud and like I said let me know if you need any help

 

screamin gt

5 Year Member

Apr 9, 2007

393

6

28

central CT

Apr 12, 2007

#8

• Apr 12, 2007

• #8

Muscle99 said:

Just listend to your clip and your noise is a lot louder then mine is. Mine only comes about at 2k RPM. And after the car is warmer its not nearly as loud. I cant hear it at idle. Does your sound like its coming from the back of the engine?

Click to expand...

yeah I forgot to add, I talked to the guy I bought it from yesterday... he said when it first started it almost sounded like a small exhaust leak, but real quiet and intermittant, and over a couple weeks just got louder and louder. then he parked it and decided to sell.


mod---- what are the stage 2 heads your talking about? have a link? who knows, depending an how much damage I have....

 

camaroguy72

20+ Year Stangneter

Mar 10, 2003

659

1

18

Apr 12, 2007

#9

• Apr 12, 2007

• #9

hey dave i do recall seeing a little blue smoke on startup which means valve seals are probably shot on that number 8 cylinder as well. Any luck getting the head off yet or at least the valve cover?

Rob

 

the98stang

Active Member

Aug 12, 2005

2,408

0

47

Clovis, CA

Apr 12, 2007

#10

• Apr 12, 2007

• #10

I think it's time to buy some VT heads, cams, and other goodies

 

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modmonster

New Member

Mar 30, 2005

43

0

0

Apr 13, 2007

#11

• Apr 13, 2007

• #11

They are just ported from patriot performance. they are the stage two proting package. If you go to patriot performance web site they have the flow charts for what they flow over stock PI heads. With the VT II cams The car runs strong! Just got done with the swap today and I think when I get a tune I will be pretty happy. I already am pretty happy with the car now man it just doesnt wanna drop off power. I definately reccomend a simalar upgrade if you can afford it and have the time. Either way though I hope you get the bent Valve fixed with as little trouble as possible bud!