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Oil smoke revisited

General engine tech -- Drag Racing to Circle Track

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chevyfreak
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Re: Oil smoke revisited

Post by chevyfreak » Sun Jun 21, 2020 2:54 pm

Maybe the oil isn't drained fast enough. Have seen numerous head gaskets where the drain hole is off and partly closes the drainback hole in the head.
Just a thought.

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Belgian1979
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Re: Oil smoke revisited

Post by Belgian1979 » Sun Jun 21, 2020 3:15 pm

I don't remember any issues with the gasket blocking the oil return hole, but next time I have my airboxes off I'll certainly check.

Just asking, but I have a HV pump with high pressure spring in there. I'm thinking that I might need to go to a normal volume, normale pressure pump.

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Re: Oil smoke revisited

Post by rebelyell » Sun Jun 21, 2020 4:45 pm

OP Belgian

If SBC, pull valve covers off heads & check that drainbacks from heads to valley are free & clear.
Next, refit std vol op.

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Re: Oil smoke revisited

Post by Belgian1979 » Mon Jun 22, 2020 3:26 am

I've been thinking about this some more. One other explanation could be that it's sucking oil through the bolts of the pedestal for the shaft mounted rockers. I've used blue RTV on them, but I've seen before it doesn't hold up well against oil.

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Re: Oil smoke revisited

Post by midnightbluS10 » Mon Jun 22, 2020 6:32 am

Kevin Johnson wrote:
Sun Jun 07, 2020 12:39 am
11/32

versus

12/32

ypost
But he wrote 3/8(or 6/16) vs 11/16, not 11/32. That's why I asked. I'm guessing 11/16 is a typo?

My buddy had such a issue with a fully brand new motor that we built.

After a ton of checking things out and playing with the Carb and pulling valve springs to look at the seals it was found to be oil / temperature related and the bottom line was found to be that the heads where assembled from the supplier with valve seals for 3/8" stem valves, and not 11/16" ' and yes even though they where for 3/8" stems, they still did drag on the stems, but only very lightly.
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Re: Oil smoke revisited

Post by Kevin Johnson » Mon Jun 22, 2020 10:45 am

"ypost" was not meant to be shorthand for "why post [this]"; it is a deliberate typo of "typos" made by transposing a letter.

Sorry about being too obtusely abstruse.


midnightbluS10 wrote:
Mon Jun 22, 2020 6:32 am
Kevin Johnson wrote:
Sun Jun 07, 2020 12:39 am
11/32

versus

12/32

ypost
But he wrote 3/8(or 6/16) vs 11/16, not 11/32. That's why I asked. I'm guessing 11/16 is a typo?

My buddy had such a issue with a fully brand new motor that we built.

After a ton of checking things out and playing with the Carb and pulling valve springs to look at the seals it was found to be oil / temperature related and the bottom line was found to be that the heads where assembled from the supplier with valve seals for 3/8" stem valves, and not 11/16" ' and yes even though they where for 3/8" stems, they still did drag on the stems, but only very lightly.

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Re: Oil smoke revisited

Post by Kevin Johnson » Thu Jun 25, 2020 12:27 am

Belgian1979 wrote:
Mon Jun 01, 2020 6:30 am
I have numerous threads out here about a smoking problem while under deceleration. I did a lot to combat this and recently used a smoke machine to check for intake leaks and such but found none.
I was ready to pull the heads next winter to have the guides redone, but today I started particularly paying attention to what it did on slow speeds. It seems to also blow some blue smoke while taking a corner. Some speed, just not hard cornering.
Is this something that is tied to the guides?
https://www.clearvueconcepts.com/

Use a couple GoPros to observe what is happening in the valve covers on your motor. I am not sure if Belgian authorities would mind you driving around a bit minus your hood (for better/inexpensive lighting?).

Science!

:D

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Re: Oil smoke revisited

Post by Belgian1979 » Thu Jun 25, 2020 1:47 pm

Well, our government doesn't allow alot, so no. We live in a part of the world that is becoming more and more communistic in nature unfortunately. Personally freedom is in serious decline here. :(

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Re: Oil smoke revisited

Post by Kevin Johnson » Fri Jun 26, 2020 12:12 am

Belgian1979 wrote:
Thu Jun 25, 2020 1:47 pm
Well, our government doesn't allow alot, so no. We live in a part of the world that is becoming more and more communistic in nature unfortunately. Personally freedom is in serious decline here. :(
This Winter's project: https://www.autoevolution.com/news/niss ... 39689.html

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