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Old 03-30-2021, 01:24 PM   #1
Slowmotoring
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Default Is some blowby normal?

im just getting the model a out for the year now that spring has finally sprung and the salt is washed off of the roads. I have noticed some oil is coming out of the oil filler neck and there seems to be a lot of air blowing out that seems to be bringing some oil vapor along with it. Is this somewhat normal? Ive seen some model a’s with what looks like a vent tube off of the filler kneck that vents underneath the car. Thats why im not sure if this is “normal” for the a’s or if i need to look into the possibility of a broken or seized ring. I have not done a compression test yet.
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Old 03-30-2021, 01:30 PM   #2
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Default Re: Is some blowby normal?

My bad. I jumped the gun with my post. I have now found that this has already been discussed. Back to the garage now.....
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Old 03-30-2021, 01:40 PM   #3
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Default Re: Is some blowby normal?

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My bad. I jumped the gun with my post. I have now found that this has already been discussed. Back to the garage now.....
No question is a bad question unless you ask it over and over again.

Oil breather, will also keep the fire wall cleaner. Venders sell several different styles.

Enjoy your car.
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Old 03-30-2021, 07:19 PM   #4
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Default Re: Is some blowby normal?

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Originally Posted by Slowmotoring View Post
im just getting the model a out for the year now that spring has finally sprung and the salt is washed off of the roads. I have noticed some oil is coming out of the oil filler neck and there seems to be a lot of air blowing out that seems to be bringing some oil vapor along with it. Is this somewhat normal? Ive seen some model a’s with what looks like a vent tube off of the filler kneck that vents underneath the car. Thats why im not sure if this is “normal” for the a’s or if i need to look into the possibility of a broken or seized ring. I have not done a compression test yet.
That’s called a draft tube, a GOOD idea.
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Old 03-30-2021, 07:44 PM   #5
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Default Re: Is some blowby normal?

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My bad. I jumped the gun with my post. I have now found that this has already been discussed. Back to the garage now.....
If that is your worst no no today you had a great day ! Enjoy the rest of your day and be safe! Wayne
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Old 04-03-2021, 11:09 AM   #6
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Default Re: Is some blowby normal?

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My bad. I jumped the gun with my post. I have now found that this has already been discussed. Back to the garage now.....
why not bring it up again?
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Old 04-03-2021, 01:32 PM   #7
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Default Re: Is some blowby normal?

Rings are not a perfect seal even less so when worn. Pistons goes up, pull air in thru the vent tube, pistons go down push air out thru the vent tube.
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Old 04-03-2021, 04:19 PM   #8
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Default Re: Is some blowby normal?

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Rings are not a perfect seal even less so when worn. Pistons goes up, pull air in thru the vent tube, pistons go down push air out thru the vent tube.
With 2 pistons going up and 2 going down, the overall volume of the sump doesn't change. Any gasses exiting from the breather are purely the result of blowby, which as has been said, is inevitable.
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Old 04-03-2021, 04:47 PM   #9
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Default Re: Is some blowby normal?

I just got done doing a compression test. Cylinder one had 58psi the rest had 60psi. I installed the draft tube after doing the compression test. Weather is nice, its getting driven...
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Old 04-03-2021, 05:03 PM   #10
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Default Re: Is some blowby normal?

Off topic: When we were cruising our sail boat, there was a boat nameed "Blew-by-U" I guess they thought is was fast. Whenever there are two sailboats in the same water going the same direction, it is a race.
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Old 04-03-2021, 07:39 PM   #11
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Default Re: Is some blowby normal?

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Off topic: When we were cruising our sail boat, there was a boat nameed "Blew-by-U" I guess they thought is was fast. Whenever there are two sailboats in the same water going the same direction, it is a race.
Or maybe it was a reference to the song by Linda Ronstadt
https://www.youtube.com/watch?v=Kp9G0zkorio
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