If it's white smoke we have a new Pope, black if not

Tubo

RTM wrote:

I'm not sure I can help but I wonder if the flooding of gas ruined the rings or something?  Have you done another compression test yet?

I was just thinking of asking the same question, Day.  How long did it run extremely rich? Do you have an AFR gauge on your test stand?  I just put one on the Heap for the express purpose of tuning the EFI.

You did say 200K,  so there a reason for some smoke.

What type of PCV system do you have? Think you might be sucking up some oil?

Could the intake manifold have suddenly sprung a leak sucking oil in? Old gaskets can suddenly fail. I have a hard time believing that running rich for a short time could wash out the rings.

Another comp. ck will tell us a LOT.   Hard to believe cylinders could have washed down and ruined rings in such a short time.  IF comp ck is good then it HAS to be a leaky gasket (I think!).......or valve seals...on BOTH SIDES simultaneously!
6s6

What intake manifold gasket are you using?
There are some that may not seal well with aluminum heads.
What intake gasket are recommended for your heads?

Are these new heads?
Have they been sitting around for a while?
If so, could be valve stem seals.

Between gasket and seals would be only way I see BOTH sides smoking.

I know when I started running my car again (11 years ago), I noticed blue smoke as well.
It would vary depending on initial start up and operating temps.
I replaced all valve stem seals with the rope method.

Smoking stopped and the mosquitoes returned.🤣

Last edited by Nos681 (2/20/2020 11:02 PM)

Nos681 wrote:

What intake manifold gasket are you using?

They are felpro gaskets.  Same type of gaskets I used on the 302 that is currently in the Galaxie with the same type of heads

Nos681 wrote:

Are these new heads?

These heads are a couple years old.  Flow tek heads purchased new from Speedway motors when I bought the engine about 2 years ago.

 

I am reading this thread and want to ask, on a stock 289 w/ 130k. When I pulled the 2bl carb under the PVC base plate I found oil laying in the small valleys if the intake. Does that mean I have a bad PVC valve in the PS valve cover, or the wrong one?

I think you’re right...thanks.
I slept since then. 🤪

I know some things that it is NOT:

It is still not the PCV valve 

It is not the rings.  Did another compression test and the cylinders are up an average of 17.5 PSI per cylinder from the fist test when the heads were stock. The increase is to be expected due to the increased compression ration.   The cylinders, on the most recent test that were the highest and lowest are not the same ones as the highest and lowest cylinders from the first test.  I'm sure the variation from the first test is due to the the fact that I changed the heads.  The rings are going to need to reseat a little bit after the head change.


It is not the fuel but for a minute I thought it was... will explain further down

its not directly the EFI

So here is what I did:
I pulled and inspected all 8 plugs all of them except 6 were fouled and wet but the "wet" had to have been fuel because when I went to clean them a couple hours later they were fouled BUT dry.

I then did the compression test.

After that I pulled one valve cover to look at the valve seals and to see if I could spot any other possible issue.  Didn't see any obvious issues.

I then removed the CFI unit and inspected the intake, no obvious problems.  

I threw the carburetor on to the intake that had been on there before the EFI and did everything required to hook it up.  I then cleaned the plugs, reinstalled them and fired up the engine.  It was still blowing tons of blue smoke and smelled strongly of burnt oil.  I then shut the gas off and ran it until the carburetor bowl was empty and the engine died. It smoked the entire time.  With the fuel still off I primed it with carb cleaner and fired it up and then used intermittent  sprays of carb cleaner to keep it running at idle.  NO SMOKE.  I thought okay bad gas so to verify that was indeed the issue I turned the gas back on on fired it up.  STILL NO SMOKE.  At this point I figured somehow oil or to much gas was pooled somewhere and that I had finally burned it off... problem solved? NOPE!!  I don't like leaving gas in the carb so I shut the gas off and throttled up to about 2500 RPM to empty the carburetor bowl.  At the higher RPM the left bank started smoking and the right bank followed a few seconds later.  Dropped it back down to idle and the smoke cleared up.

So this is what I think (please tell me if you agree or if you think I am totally wrong)

Under strong vacuum (the EFI has smaller butterflies than the Carburetor so vacuum should be up) oil is coming in through either the valve seals or the valve rocker studs.  I am leaning towards the studs.  When I installed them I followed the directions and used a specific permatex sealant on the studs. (the one recommended by the head manufacturer)   I used the same sealant when I installed the exhaust plugs on both ends of the heads.  The exhaust plugs are leaking and I think maybe I didn't use enough permatex, or there was something wrong with the tube of sealant I purchased??  

The only other thing I can think of is (as was suggested by so many of you) that the intake is some how leaking where it attaches to the heads and allowing oil into the intake runners.  

 

Could it be an oil pump putting out more oil than the return passages can handle?