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Old 07-04-2011, 07:52 PM   #1
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Default Water in oil. compression still ok

Last Saturday when I was driving on track my car start to hesitate. I wasnít overheating (water was 220F and oil 230F). When I open the hood I notice that my catch can was overflowing with oil.
  • I check the compression. 173-170-169-175. Stock 8.8:1 pistons 100K miles driven. I got same compression result year ago.
  • Oil-stick is full of milky cream
  • Top of the catch can is full of (condensed?) water
  • I fill up my radiator 500miles ago and look like there's about half a gallon shortage now
  • Iím using 250cc/min water-injection but sounds odd if that water got past the rings

Sounds like head gasket has gone bad. But why my compression results looks the same as when i didnít have these problems?
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Old 07-05-2011, 09:18 AM   #2
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If oil is blowing out it has to be high pressure in cylinder head right? Compression seems to be ok. And only 5-10psi higher with drop of oil so I assume that rings are ok.

So that leaves the head gasket or loose cylinder head bolts. Guess I can re-torque those bolts or maybe better, change ARP bolts there.
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Old 07-05-2011, 02:50 PM   #3
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check your cylinders for cracks mine had good compression, and oil/water mix
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Old 07-05-2011, 04:55 PM   #4
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Quote:
Originally Posted by hf-mx5t View Post
check your cylinders for cracks mine had good compression, and oil/water mix
mine HAD good compression, and coolant in my oil.
also founded that ''water/coolant'' in my catch can.
cracked cylinder head for me
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Old 07-06-2011, 11:37 AM   #5
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Well letís hope that isnít the case. I just bought that head and had that checked for valve leaks.

I did compression test again with drop of oil. Wet results were about 8-12PSI higher so it is probably the head gasket. Why canít my car run even a month without problems
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Old 07-06-2011, 06:13 PM   #6
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dont be that disapointed, changing it takes about 3-4h

i installed a 150$ cometic head gasket with 100$ worth of bolts after going to make sure my head was straight. it sure was straight....and cracked.
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Old 07-07-2011, 05:57 PM   #7
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Cylinder head is off and I didn't found cracks or anything unusual. Guess if I want to be sure I have to get that leak-tested again. But I’m almost sure that cause of all this is my old head bolts which I been re-using over 6 times by now

Here’s a picture of water injected head: http://www.miata.fi/kuvat/head070711.jpg
Exhaust valves is covert with that “hard white stuff”
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Old 07-10-2011, 06:42 PM   #8
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Quote:
Originally Posted by kaboshe View Post
mine HAD good compression, and coolant in my oil.
also founded that ''water/coolant'' in my catch can.
cracked cylinder head for me
Did you found that crack looking it? Or can those cracks be so small that eye canít see it
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Old 07-10-2011, 08:22 PM   #9
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could not find anything just by looking at it, i did not extended my search too long since b6 are so cheap i ordered another one for next-to-nothing.


I went to a shop that did a leak down test, told me i had a cracked head, and i drove home just like if i stole it.i'm curently getting the engine out
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Old 07-19-2011, 03:12 AM   #10
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A little update: I change the HG and replace those old bolts with ARP stuff. Start the car. Had it run 15min. Tested compression again and it changed from 173-170-169-175 to 195-190-185-175 PSI
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Old 07-23-2011, 10:21 AM   #11
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while installing the new engine i founded the ***** who was ******* everything up
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Water in oil. compression still ok-dsc00606.jpg  
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Old 07-25-2011, 07:47 AM   #12
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Itís probably safe to say that this problem is now gone. It was bad head gasket or the head bolts..or both.
Coolant level has stayed the same and same goes with oil And car pulls hard
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