Compression test results *pics*

[rdsnake]

So after I started to hear my heads start ticking, oil smoking on start-ups, and a power loss at the top of 3rd gear in high RPM, I decided to do change my oil with reg. dino oil, clean my PVC and pull my plugs & do a compression check. So I Check out all of the plugs and the #4 plug was crack (my power loss in third), my #6 plug was covered in oil (my bad valve guide..the ticking). Remind you these plugs have less then 50 miles on them, sutton put them in when i got the car back from the dyno. FYI all plugs are NGK TR6's gaped at 27. Here are the results of the compression test.

Cyl. #1...154 PSI
Cyl. #2...147 PSI
Cyl. #3...156 PSI
Cyl. #4...158 PSI (this was the cyl with the cracked plug *see pic*)
Cyl. #5...169 PSI
Cyl. #6...165 PSI (this was the cyl with the oil fouled plug)
Cyl. #7...113 PSI
Cyl. #8...149 PSI

Im very lucky the porcelain didn't fall into my #4 cylinder, I don't think anything is up with #4... because the gap on the plug didn't change.....im leading to think it was a faulty plug or it was dropped somewhere along the lines of being installed into my car.

Number 6 seems too me to be were all of the blue smoke is coming from..like the bad valve guide??

Cyl. #7 is a my PITA, Im not too sure what is going on with that cylinder but im going to bring home a cylinder leak down tester from work and throw it on that cylinder and see where it is coming.

Air from Throttle plates, junk head, SCORED SAVED THE MOTOR!
Air from exhaust, junk head, SCORED SAVED THE MOTOR!
Air from oil cap, Junk motor, SCORED ITS STROKER TIME!

Here is a picture of the cracked porcelain in #4, like i said this cause my loss of power in 3rd and sometimes 4th gear in high RPM

Here is a picture of #6, my bad valve guides.

Click to read more...

 

[ExplorerThis]

Do you beat on your car alot? Im surprised this happened....Maybe it was the tune....

 

[gnxs]

Im surprised this happened......

I'm not.

 

[ExplorerThis]

May I ask why?

 

[rdsnake]

i don't beat on the car that much..but i do get in her sometimes...out well shit happen's right?

 

[Boost12]

How much Boost were you running ? And was this on pump gas?

 

[Oncebitten03]

Do you have a cooling mod or no?

 

[rdsnake]

Do you have a cooling mod or no?

yea i do plus a HE

 

[Flyn]

Pics a little blurry but those spots in the #4 plug might be from detonation.

How much boost and what octane fuel?

 

[rdsnake]

19ish? i dont have a boost gauge that goes up that high, 93 octane, safe tune 12.5 a/f all the way up the rpms

 

[Wiked03]

19ish? i dont have a boost gauge that goes up that high, 93 octane, safe tune 12.5 a/f all the way up the rpms

12.5 is a pretty high. How much timing?

 

[Stangfreak91]

19ish? i dont have a boost gauge that goes up that high, 93 octane, safe tune 12.5 a/f all the way up the rpms

DAMN! It was nice to meet you last night at streets. Hope you get it worked out.

 

[rdsnake]

DAMN! It was nice to meet you last night at streets. Hope you get it worked out.

Nice ride by the way...too bad i didn't have the cash, I would of bought your ride! Ill get it all taken care of...im going to call VT on monday and see whats up :biggthump

 

[rdsnake]

12.5 is a pretty high. How much timing?

you really think 12.5 is high...i belive thats where a good "street tune" AF should be. Im not sure about timing. I dont have a Xcal2 or anything. I just had them reburn the SCT chip KB gave me.

 

[Boost12]

I have never seen a tuner that would even tune a AF close to 12.5 so I would think thats a tad on the lean side. I know I run a wideband at all times in my car and anything above 12.3 I was told to lift by my tuner if that means anything

 

[VenomInside]

yea 12.5 is on the leanish side.. i usually like my a/f between 11.7-12.0 max.

 

[Flyn]

you really think 12.5 is high...i belive thats where a good "street tune" AF should be. Im not sure about timing. I dont have a Xcal2 or anything. I just had them reburn the SCT chip KB gave me.

Middle 11s is where most guys want their street tunes to be. 12.5 A/F + 19 lbs. of boost + 93 octane is really pushing the envelope.

At 19 lbs. of boost, you may want to think about running higher octane than 93 all the time.

 

[rdsnake]

Middle 11s is where most guys want their street tunes to be. 12.5 A/F + 19 lbs. of boost + 93 octane is really pushing the envelope.

At 19 lbs. of boost, you may want to think about running higher octane than 93 all the time.

never said shit about high octane...just gave me a 93 tune....I don't think the tuning is the problem...ive always had blue smoke on start ups i just think the blower and tune enhanced the problems of the car...

 

[gnxs]

Middle 11s is where most guys want their street tunes to be. 12.5 A/F + 19 lbs. of boost + 93 octane is really pushing the envelope.

At 19 lbs. of boost, you may want to think about running higher octane than 93 all the time.

:ditto:

- 12.5 A/F
- 19 psi and pump gas

When this KB went on I seem to remember hearing about running a stock MAF, running the canned KB Tune, high boost and pump gas and I mentioned to one or two people here that this car was a ticking time bomb.

When you start to approach 600 rwhp you're more like 650-675 at the crank. Sorry, but that's alot of power to make live on 93 octane from 4.6 liters. Some people have gotten lucky and some people haven't.

I mix 100 octane in on my street tune with 17 psi and an 11.5-11.8 A/F and I still think my motor is on borrowed time.

 

[Mr. Unknown]

looks good to me.





lol!

 

[voj]

Air from Throttle plates, junk head, SCORED SAVED THE MOTOR! Air from exhaust, junk head, SCORED SAVED THE MOTOR! Air from oil cap, Junk motor, SCORED ITS STROKER TIME!

Did you bring the cylinder(s) up to tdc?
Air from intake=intake valve related. Air from exhaust=exhaust valve related.
air from the oil cap= piston/rings. So everything is not necessarily junk...


The other members have already gone over this well but, with 19psi, 93, and 12.5 as everyone else has stated is risky, especially the 93. I could imagine you being *ok* while running lean (~12.5 a/f) if you would have increased the octane to 100/110, or mixtures of both, but definitely highe than 93.

Also why would you consider going to a stroker (5.0) The stroke on the 4.6 is 3.543 inches which is quite a bit of stroke for such a small engine, and any more stroke would cause excessive wear on the ringlands, or so I hear.

:burnout:

 

[Whitey04]

113psi? that is definitly bad. Did you have the valve ticking problem before this? Because your valve guides are bad. Blue smoke on start up means your valve guides are leaking oil. Older camaro did this real bad. I've even seen some newer one do it. And a cracked plug means the cylinder is running to hot. Which can be cause by your lean tune. Lean means hot and you think your plug was bad I wish you could see the valves and piston head. That shit is probably burned up. But no knocking, you may have caught it in time.

 

[cyac5l8trfcar]

You smoked a ring. I have a friend that had something like that happen with a nasty back fire, we tore down the motor and found the cylinder had a cracked piston, and chunks were missing. He had more compression than you. return to stock and drive out of the area for the work.

 

[rdsnake]

Did you bring the cylinder(s) up to tdc?
Air from intake=intake valve related. Air from exhaust=exhaust valve related.
air from the oil cap= piston/rings. So everything is not necessarily junk...


The other members have already gone over this well but, with 19psi, 93, and 12.5 as everyone else has stated is risky, especially the 93. I could imagine you being *ok* while running lean (~12.5 a/f) if you would have increased the octane to 100/110, or mixtures of both, but definitely highe than 93.

Also why would you consider going to a stroker (5.0) The stroke on the 4.6 is 3.543 inches which is quite a bit of stroke for such a small engine, and any more stroke would cause excessive wear on the ringlands, or so I hear.

:burnout:

yes i am awear that everything has to be at DTC.....i called VT today and they said a 5.0 stoker would be a good deal..

 

[rdsnake]

113psi? that is definitly bad. Did you have the valve ticking problem before this? Because your valve guides are bad. Blue smoke on start up means your valve guides are leaking oil. Older camaro did this real bad. I've even seen some newer one do it. And a cracked plug means the cylinder is running to hot. Which can be cause by your lean tune. Lean means hot and you think your plug was bad I wish you could see the valves and piston head. That shit is probably burned up. But no knocking, you may have caught it in time.

I Had the blue smoke on start ups when it was stock..ford did nothing with this porblem. It just said ticking from the guides

FYI I looked at the dyno sheet and the AF does seem to be at 12..i just glanced at it and looked like 12.5 to me for some reason