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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Need help with excessive oil getting into cylinders on new build (https://www.offshoreonly.com/forums/general-q/368971-need-help-excessive-oil-getting-into-cylinders-new-build.html)

Gimme Fuel 10-21-2020 01:51 PM
Originally Posted by zz28zz (Post 4762518)
My thoughts on the breather filters are that I believe they are designed to filter relatively clean dry air under hood into the crankcase. Without a pcv sys they would be flowing backwards.

I had similar filters on my street bike that were washable and after they dried, you would add some filter oil to them. I remember they don't like to get wet (with water). I'd have to put plastic bags over them at the car wash.

This makes me wonder if oil mist mixed with water vapor (condensation) might plug them up. Once the condensation dried, they would flow again. It also might take time to plug up, so no issues for a while, then bam, they plug up again. Once again, another thing to check after its back together.

Were these filters installed on the orig "no issues" build?
If so,, disregard this post.
Had this happen on my 548 with K&N breathers. Felt like rings didn't seal and had excessive blow by and breathers were dripping with oil. Those filters directly on covers get oil mist soaked in them and quit being able to flow air. I changed to different and taller style and no issues after that.

articfriends 10-21-2020 04:41 PM
Originally Posted by Gimme Fuel (Post 4762592)
Had this happen on my 548 with K&N breathers. Felt like rings didn't seal and had excessive blow by and breathers were dripping with oil. Those filters directly on covers get oil mist soaked in them and quit being able to flow air. I changed to different and taller style and no issues after that.
I thought you also lost ring seal though from piston touching the cylinder head from not enough piston to head clearance at one point too at .027, was that the same motor? at same time, just curious.

underpsi68 10-21-2020 10:05 PM
Originally Posted by Gimme Fuel (Post 4762592)
Had this happen on my 548 with K&N breathers. Felt like rings didn't seal and had excessive blow by and breathers were dripping with oil. Those filters directly on covers get oil mist soaked in them and quit being able to flow air. I changed to different and taller style and no issues after that.
Breathers are not right on valve cover. It was pushed down in picture. Off the top of my head the breather tubes welded on the valve covers are about 4" high(similair to the driver side). Plus a trick i do is cut a piece of a/c filter foam and roll up and put in tube. It has very large cells. Will catch any oil before it hits the breather element. It will drip back down. Did that on the working engine for 10 years.

I will look into breathers and put carb filters on each cover if needed. 😄

underpsi68 10-21-2020 10:13 PM
Originally Posted by snapmorgan (Post 4762536)
A couple of questions. Is this a long stroke or long connecting rod engine where the wrist pin is up in the oil ring? Who is doing the short block assembly? Are the rings being lubricated on assy? I know that I will catch some heat for this, but most rings these days should be installed completely dry for proper ring seating.

This is a good friend of mine and he is Mr. SBF. Give him a call and I am sure that he can get to the bottom of it. His name is Ray, tell him that Joe sent you
https://www.rrmotorsports.net/
I spoke to Ray today. Very nice guy.

Ray very quickly said oil was getting past the rings, not coming from the heads, which confirmed my suspicion.

Hopefully going to start building engine this weekend. If anyone has any other thoughts, I would love to hear them.

Thanks Joe and all helping out!!!!

Gimme Fuel 10-22-2020 07:02 AM
Originally Posted by articfriends (Post 4762611)
I thought you also lost ring seal though from piston touching the cylinder head from not enough piston to head clearance at one point too at .027, was that the same motor? at same time, just curious.
No that was first attempt and had the gapless stainless rings and 0.27" gasket haha. Rebuilt with conventional AP rings and .039" head gasket and still had a WTF moment when running and questioned ring seal again. Changed breathers to tall stainless style, and no more issues all summer until slowly degrading oxygen sensor and left active auto-tune detonated a piston on last run of the year.

thirdchildhood 10-22-2020 11:23 AM
I own 3 Mustangs and am intrigued by this thread. I'd love to know more about this Mustang when you get it straightened out!

SB 10-22-2020 01:27 PM
Good quick read for everyone:

https://www.precisionturbo.net/tech/...mendations.pdf

underpsi68 10-22-2020 07:22 PM
Originally Posted by SB (Post 4762747)
The biggest reasons turbos will smoke is poor drainage. The oil can not get out and the pressurized oil has no where to go except out the shaft. At that point it will either go in the compressor side (into intake) or in the exhaust system (not going directly into the engine).

Here is a better picture of my breather. 2" tube
https://cimg8.ibsrv.net/gimg/www.off...1d7da0bac1.jpg

underpsi68 10-22-2020 07:25 PM
Originally Posted by thirdchildhood (Post 4762725)
I own 3 Mustangs and am intrigued by this thread. I'd love to know more about this Mustang when you get it straightened out!
I didn't think there were many Ford fans on this site 🤔.

It's not a matter of when, it's IF I get this straightened out. Lol

If there is any interest, i could start a build thread.

underpsi68 10-22-2020 07:33 PM
https://cimg3.ibsrv.net/gimg/www.off...a1c3839502.jpg


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