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Old 11-15-2019, 03:41 PM   #1
reddog565
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Default y-block blow by..

hi guys! I need your thoughts? I have a 272 (1956).
that I rebuilt less than a year ago. I'm running "trips".
the problem I'm having is, I'm getting a lot of blow by
from the oil filler tube! I know the engine is mechanically
healthy, as I rebuilt it. I have a pcv installed in the top
of the block. (not the valley pan). the road draft tube
has been eliminated.(blocked off). I understand, the
oil filler tube also acts as a fresh air intake. but, something
I'm not doing right, because there is too much blow by
thru the filler tube, thus fumes are getting into car..
I know all you guys are extremely sharp! so, I'm sure
someone has a fix.
thanks!!
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Old 11-15-2019, 04:21 PM   #2
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Post Re: y-block blow by..

Quote:
Originally Posted by reddog565 View Post

hi guys! I need your thoughts? I have a 272 (1956).
that I rebuilt less than a year ago. I'm running "trips".
the problem I'm having is, I'm getting a lot of blow by
from the oil filler tube! I know the engine is mechanically
healthy, as I rebuilt it.

I have a pcv installed in the topof the block. (not the valley pan). the road draft tube has been eliminated.(blocked off). I understand, the

oil filler tube also acts as a fresh air intake. but, something I'm not doing right, because there is too much blow by thru the filler tube, thus fumes are getting into car..

I know all you guys are extremely sharp! so, I'm sure
someone has a fix.

thanks!!
Can you show a photo of the PCV SYSTEM install?

If she is pumping fumes out of the filler cap, it is either non-functional and/or has extreme blow-by.
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Old 11-15-2019, 04:50 PM   #3
reddog565
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Default Re: y-block blow by..

Sorry guys, having a difficult time uploading
A picture...
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Old 11-15-2019, 05:02 PM   #4
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Default Re: y-block blow by..

Keep trying. If you need help, yell.
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I told her that it was no way to run a cat-house and hung the phone up ...


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Old 11-15-2019, 05:47 PM   #5
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Default Re: y-block blow by..

The pcv valve is next to distributer.
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File Type: jpg IMG_20190705_091719900.jpg (41.5 KB, 84 views)
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Old 11-15-2019, 05:54 PM   #6
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Default Re: y-block blow by..

Has the engine been having this issue ever since you installed the PCV system, or did it start later on it's own ? Even after a fresh rebuild things can happen to cause more blow by.


Sal
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Old 11-15-2019, 06:07 PM   #7
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Default Re: y-block blow by..

I can't tell where your hose is connecting to in the block from that picture. What you should be trying to do is to ventilate the crankshaft.
Best way is to have openings at opposite ends of each other in relation to crankshaft. The original ideas of having the oil filler cap with an integral filter and ventilation tube/screen cannister in the lower block is good and the other being at the back of valley pan instead of the tube is okay also.
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Old 11-15-2019, 06:46 PM   #8
reddog565
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Default Re: y-block blow by..

Sorry guys, couldn't get a better picture .as
I stated previously. The pcv valve is tapped
Into the block. It's vacuum is supplied from the
Port between ctr. And front carb. I'm wondering
If I should put the road draft tube back on it?
Such as Dave said about having ventilation
At opposite ends. Does anyone have a good
Canister and tube?
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Old 11-15-2019, 07:00 PM   #9
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Question Re: y-block blow by..

Quote:
Originally Posted by reddog565 View Post

The pcv valve is tapped Into the block. It's vacuum is supplied from the
Port between ctr. And front carb.
Do you mean the PCV install is as shown below?
Attached Images
File Type: jpg PCV- Valve Relocation _3.jpg (17.4 KB, 60 views)
File Type: jpg PCV Vacuum Source- FYB EDEL 573.jpg (142.8 KB, 55 views)
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I told her that it was no way to run a cat-house and hung the phone up ...


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Old 11-15-2019, 07:13 PM   #10
reddog565
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Default Re: y-block blow by..

Yes kultulz. That's exactly what I have! I'm thinking the engine is not breathing properly so it's just blowing it back out of the oil filler tube?
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Old 11-15-2019, 07:21 PM   #11
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Exclamation Re: y-block blow by..

Quote:
Originally Posted by reddog565 View Post

Yes kultulz. That's exactly what I have! I'm thinking the engine is not breathing properly so it's just blowing it back out of the oil filler tube?
You do not have an effective system. The valve has no baffling and will ingest spray/vapors making the system ineffective.
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I told her that it was no way to run a cat-house and hung the phone up ...


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Old 11-16-2019, 02:55 AM   #12
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Post Re: y-block blow by..

Quote:
Originally Posted by reddog565 View Post


Yes kultulz. That's exactly what I have! I'm thinking the engine is not breathing properly so it's just blowing it back out of the oil filler tube?

Let me be more concise, the setup @ the carb is fine. It is the actual valve setup that is ineffective.
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I called and inquired as to the fee(s) for a SEXUAL ASSAULT and that woman lit into me ...

I told her that it was no way to run a cat-house and hung the phone up ...


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Old 11-15-2019, 07:55 PM   #13
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Default Re: y-block blow by..

I had a PCV valve in the valley pan without sufficient baffling. It pick up a lot of oil, which on my set up mainly ended up in # 7&8 cylinders. But that was into the rear carb fitting on a 4 barrel. A stuck PCV valve will also produce your symptoms, to the point of blowing out a valve cover gasket in extreme cases. (Ask how I know, and the mess of oil on the exhaust is almost as bad as the heart attack when all the smoke shows up).

What engine was that PCV designed for? Did it mount vertically in the OEM application?

How much oil is the engine using, and how many miles since the rebuild?
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Old 11-16-2019, 02:28 AM   #14
reddog565
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Default Re: y-block blow by..

I believe the pcv valve was supposed to be
For a y block application.the engine doesn't
Use oil. There's probably a couple thousand
Miles on Rebuild.
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Old 11-16-2019, 07:21 AM   #15
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Default Re: y-block blow by..

So, what needs to be done to
Fix this problem?
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Old 11-16-2019, 12:32 PM   #16
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Post Re: y-block blow by..

Quote:
Originally Posted by reddog565 View Post

So, what needs to be done to Fix this problem?
You read the URL I showed describing the OEM SYSTEM?

Because of your intake type (plenum hanging over valley cover). there will have to be a few modifications. I am sure that what the original owner attempted.
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I called and inquired as to the fee(s) for a SEXUAL ASSAULT and that woman lit into me ...

I told her that it was no way to run a cat-house and hung the phone up ...


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Old 11-17-2019, 09:49 AM   #17
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Default Re: y-block blow by..

Quote:
Originally Posted by reddog565 View Post
So, what needs to be done to
Fix this problem?
Since you drive the car daily in good weather, the fix may be to modify a set of original valve covers for a PCV system. The covers are very easy to swap out so just put your fancy ones on for shows, and the OEM ones for driving. Glue the gaskets to the covers and put a little high temp grease on the head surface so the gaskets don't stick.
Then if someone wants a ride, they won't need a gas mask!
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Old 11-17-2019, 11:05 AM   #18
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Unhappy Re: y-block blow by..

OK ...

I readily admit that I am extremely CDO (correct alphabetical order of OCD).

What you are describing would blend perfectly with a external rocker arm lube kit. I see your point if it was a beater or truck application. I am sure the OP wants a clean driver without having to change rockers overs on a regular basis. But this engine has three deuces and is partially dressed.
Please don't hate me ...
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Be advised the SEXUAL ASSAULT HOTLINE (as found in the telephone book) is not an actual dating service.

I called and inquired as to the fee(s) for a SEXUAL ASSAULT and that woman lit into me ...

I told her that it was no way to run a cat-house and hung the phone up ...


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Old 11-17-2019, 11:11 AM   #19
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Thumbs up Re: y-block blow by..

Look what I found in an older post -





Y-Blockhead has a perfect install. I am not sure if the EDEL is a 553 or 573, but everything fits.
Attached Images
File Type: jpg Y-Blockhead _2.jpg (43.8 KB, 81 views)
File Type: jpg Y-Blockhead _1.jpg (76.0 KB, 74 views)
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*** BOARD ANNOUNCEMENT ***

Be advised the SEXUAL ASSAULT HOTLINE (as found in the telephone book) is not an actual dating service.

I called and inquired as to the fee(s) for a SEXUAL ASSAULT and that woman lit into me ...

I told her that it was no way to run a cat-house and hung the phone up ...



Last edited by KULTULZ; 11-17-2019 at 06:32 PM. Reason: RE-CAPTURE PHOTO
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Old 11-16-2019, 07:36 AM   #20
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Default Re: y-block blow by..

what kind of rings did you use.i had trouble with a set of moly rings.the first time i saw a pcv in that spot i wondered.the dist, spinning in the cam gear is going to throw a lot of oil around.most of the top end oil is running down there.
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