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Old 03-05-2013, 03:12 PM   #1
some dude
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Default 06 wrx oil cap removal and blow-by

I have a stock 06 WRX. It has 148k on the original engine. It basically consumes no oil and I got over 7k between oil changes with UOAs to guide me. Today I removed the oil cap while the engine was on for the first time to see how it would do and check for excessive blow-by. It seemed to be puffing away just like a small muffler. There is a regular amount of air being pushed out of the tube but no smoke, and just a slight oil smell to it. How much air would come out of there in a correctly running tight engine?
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Old 03-05-2013, 03:51 PM   #2
Jkmaynard
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I have wondered this also
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Old 03-05-2013, 04:03 PM   #3
sp1nz
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As far as I know, any consistent smoking is bad news, but I'm an amateur so take this with a 12" block of salt.
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Old 03-05-2013, 04:09 PM   #4
some dude
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Here is a link to my latest Used Oil Analysis. I ran 8,700 miles on T6. I am feeling pretty happy about the results. I also took a small video of my oil inlet that I will try to post.

https://docs.google.com/file/d/0B2ti...it?usp=sharing




Between the two videos posted above, my car is just like the first one. There is no smoke coming out at all. There is air though.
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Old 03-05-2013, 04:18 PM   #5
SeeeeeYa
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If you remove your oil filler cap and put your face close to it with the engine running you will think it is puffing out air... and it is. But that is only half the story, in a well-functioning motor it will also be sucking in the same amount... but you won't notice this part.

Smoke being puffed out is obviously a bad sign.

To test if there is pressure in the crankcase, and not the normal push-and-pull of air as the pistons displace the crankcase air, do this:

-With engine idling unscrew the oil filler cap but do not completely remove it..

-Holding the now unscrewed oil filler cap between thumb and forefinger let it sit on the top of the oil filler pipe.

-In a good engine the filler cap will remain on the top of the filler tube as you hold it, feeling like it is lightly sucked down onto the pipe, but jiggling in your fingers.

One might wonder why it is sucked down instead of bouncing up and down, since the piston pulses should be symetrical. The reason is because the crankcase is under engine vacuum at idle, and the crankcase air pulses are, essentially, cancelled out.

Last edited by SeeeeeYa; 03-05-2013 at 04:25 PM.
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Old 03-05-2013, 10:19 PM   #6
Uncle Scotty
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Quote:
Originally Posted by some dude View Post
I have a stock 06 WRX. It has 148k on the original engine. It basically consumes no oil and I got over 7k between oil changes with UOAs to guide me. Today I removed the oil cap while the engine was on for the first time to see how it would do and check for excessive blow-by. It seemed to be puffing away just like a small muffler. There is a regular amount of air being pushed out of the tube but no smoke, and just a slight oil smell to it. How much air would come out of there in a correctly running tight engine?
beautiful.....
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Old 03-06-2013, 01:55 PM   #7
some dude
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^ yeah, I was a little shocked when I discovered that. I am going to check out what was mentioned above and hold the oil cap on there gently. As said earlier, the air coming out seems very clean :/
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Old 03-06-2013, 08:50 PM   #8
Uncle Scotty
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Quote:
Originally Posted by some dude View Post
^ yeah, I was a little shocked when I discovered that. I am going to check out what was mentioned above and hold the oil cap on there gently. As said earlier, the air coming out seems very clean :/

if there is no smoke....and the 'puttering' is regular

ya all good

if ya got a huricane blowin outa the ho.....
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