So I did a compression test tonight

[brisvr4]

I did a compression test on the old girl tonight and got the following numbers...
#4 - 160
#3 - 155
#2 - 155
#1 - 0
Even dropping oil into the cylinder didn't help it.

I am NOT a happy man at this point! Might have to start pulling it apart tonight to see what's up with it.
And it is supposed to be making an appearance at our drag day on the 12th of July.....

 

[EVO-00X]

Fark man... thats gotta suck :cry:

 

[brisvr4]

It sure does! I will have to get a 10mm hex socket in the morning and pull the head to see how much carnage there is in there!

 

[to4garret]

have you an idea of what has happened?

burnt valve perhaps...

 

[brisvr4]

Not yet, I'm hoping for a valve problem
Will know for sure in the morning but knowing my luck I'll have a buggered piston.

 

[GSRSOL]

damn thats not good! It could be worse though :?

 

[3zercrowd]

I did a compression test on the old girl tonight and got the following numbers...
#4 - 160
#3 - 155
#2 - 155
#1 - 0
Even dropping oil into the cylinder didn't help it.

I am NOT a happy man at this point! Might have to start pulling it apart tonight to see what's up with it.
And it is supposed to be making an appearance at our drag day on the 12th of July.....

WHOA WHOA WHOA...Do a leak down test first before you pull it apart mate.....

I did mine as well tonight as a coincidence

1-4>>>155 145 145 150

Also changed the plugs to new BKR7E's with 0.65 gap


Hope it all works out Tim

 

[Jonson]

Either way it means something isn't right and needs repairing. Sorry to hear Tim.

 

[brisvr4]

How is a leak down test going to help Dane?
Will it allow me to hear where the air is escaping?
The head will have to come off regardless... And I just did the bloody timing belt too :evil:
Hope it is something simple Jon

 

[3zercrowd]

How is a leak down test going to help Dane?
Will it allow me to hear where the air is escaping?
The head will have to come off regardless... And I just did the bloody timing belt too :evil:
Hope it is something simple Jon

OK

Hope it all goes well.

 

[iluszn]

maybe pull the rocker off and do leak down..

if its a valve open a bit. atleast you will hear it or even see which valve it is.

But sounds like a head removal job. good luck.

 

[brisvr4]

Well I got the head off this morning. Didn't bother with a leak down test though.
The pistons all look fine, even still has cross-hatching on the bores which leads me to think that it has had a freshen up before.
I have a GGSR head here so I will give it a rebuild with new valves, guides and springs etc.

Here is a shot of the valves in Cyl 1 and a shot of the block.
Don't mind the oil and general wetness in cyl 1 , that is from where I put some oil in last night to try to get a reading.
Note how my water injection is actually starting to clean the pistons after only an hour and a half drive time

 

[EVO-00X]

Your valve in the bottom right hand corner looks like it has a bad case of melanoma from being in the sun too long :lol: She's cooked!

 

[brisvr4]

Yep, pretty nasty :lol:

 

[Jonson]

Atleast you found the cause. Some new oversize valves? Work the head while your at it? :lol:

 

[brisvr4]

Not too sure about that Jon, I might clean up the ports and bowls a bit.
Going to throw in new springs and valves (obviously lol ).
I am still trying to work out which Headgasket to go for as I spent last night reading up on them and there are so many varied reports out there.
I was think of either a Mitsi MLS or the Felpro mls.
The only problem with those that I can see is the fact that I haven't had the block face machined. It *should* be dead flat as I never had any problems with it before though.
Copper gasket spray can't hurt either

 

[Jonson]

I don't use any sealant with metal gaskets.
As a quick test you can ust put a good steel rule along the face of the block at lots of different points, you will soon see if there is any big gaps to worry about. It's not a perfect test by any means, but atleast it gives you a strong indication if the block surface is level.

I'm running a Mitsu MLS, pretty happy with it. If you want one let me know.

 

[EVO-00X]

It is always best to get the block surface milled, but if you cant because its still in the car then after a good clean and sand to remove the crap off the surface, use Copper or Hylomar spray with a new headgasket for sure!! As Jonson said, because of the heat you have suffered in number 1 cylinder do a steel rule check first with using a torch (works better in a dimly lit garage to see if light shines through) to look for any surface inconsistencies. Then if it checks out OK, grab a can of Copper or Hylomar spray, give the surface a light even coat and put on the new headgasket. For $30 a can its good insurance over a leaking headgasket (which you dont want to take off the head to fix later just for sake of $30) :wink:

 

[vr4goleta]

hmmm
when i done a compression test 2 years ago when i got my vr4, it only had 120psi from memory, still goes alrght tho.

sorry for the off topic question but how exactly do you hook up water sprayers and how do they work, i have heard people speak of them before

 

[brisvr4]

120psi is getting pretty low from memory, I believe 114psi is the service limit on a 4g63?
It all depends whether you are talking about a water spray for the intercooler or water injection which injects a mix of either water, water/metanol or what I use, water / ethanol.
After the one decent hard run that I gave it with the water injection the manifold was actually cold to touch.