Okrasa vented valve cover question

coolairX2 · Samba Member Joined: September 08, 2003 Posts: 478

I purchased a pair of repro okrasa vented valve covers. I was expecting that I would have to tie these to a breather box. But now that I have the covers it looks like they were meant to just exhaust right out of the valve cover tube. I say this because there is not enough tube to attach a hose to. Is this the case? It seems like a bad place to exhaust oil vapor, above the heater tube.
Craig

Mr. Motorhead · Posted: Sun Sep 16, 2012 1:19 pm Post subject:

You really won't get any significant amount of oil out of them at all. Since the vent tube starts at the top of the cover it vents just air. On the last engine I ran them on after 28k miles the valve covers looked about what you would expect a non vented cover to look like.
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gatorwyatt · Posted: Sun Sep 16, 2012 3:31 pm Post subject:

Yea hardly have anything coming from mine...little tiny wetness around the opening of the tip.
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EverettB · Posted: Sun Sep 16, 2012 5:44 pm Post subject:

Are the repros like these regular 36hp ones I have or are the "Okrasa" ones something different?

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If they are the same, my friend has these on a normal 36hp engine and I can't remember seeing any leakage from the tubes.
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coolairX2 · Samba Member Joined: September 08, 2003 Posts: 478

Thanks for the info,
I installed them and they look nice and function fine as you described.
Craig

Mr. Motorhead · Posted: Sun Sep 16, 2012 7:09 pm Post subject:

RichardinNZ · Posted: Mon Sep 17, 2012 1:40 pm Post subject:

The 58 to 60 Factory workshop manual has complete details of how to make these including all dimensions etc.

Thanks
Richard
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gatorwyatt · Posted: Fri Sep 21, 2012 10:18 am Post subject:

^^^ this...

And they are not anything to do with Okrasa...just vented valve covers designed by the factory.
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Mr. Motorhead · Posted: Fri Sep 21, 2012 6:29 pm Post subject:

I call them "NOkrasa" valve covers. It's a bit of fiction attached to these and a few other parts that were never made by the real company.
_________________
30 years experience in the sales of new and used auto parts!
36 horsepower parts for sale at http://www.aircooledresearch.com/
Or the new site at http://www.bugparts.com
Check out the Bonneville project:
http://aircooledresearch.com/docs/thebonnevilleproject.html#

"All limitations are self imposed."
Some Chinese guy

pig-pen · Posted: Sun Jan 18, 2015 8:11 am Post subject:

on the subject of breathing etc...

I am going to run an electric fuel pump, so will be blanking off the mechanical one, if I get a vented plate for a later engine does this need to go to a box? will it fit the 36hp case? if running it to a box along with valve covers can I just forget about breathing at the filler? It would be much neater and less plumbing.

finally, can I just vent the valve covers as per these ones (but I am using speedwell ones) straight out onto the floor, and run the fuel block off vent for case breathing into the intake or something?

must add never put breather onto a motor before etc. sorry if these are all daft questions!

Smile

pig-pen · Posted: Sun Jan 18, 2015 8:23 am Post subject:

also... another thought, but please be gentle...
could I use this plate as an oil return line for full flow? rather than tapping the case?
and then vent out of the oil filler as normal?

slalombuggy · Posted: Sun Jan 18, 2015 10:15 am Post subject:

I haven't done a lot of engine venting on 36hp stuff but this is what I can tell you about what I've found on my bigblock race engines at Bonneville. Internal engine pressure starts in the case, not the heads. Anything you can do to relieve pressure at the case will be better than trying to vent it at the heads. I run a #8 line out of my fuel pump block off to a breather box and vent out of the filler to the same breather box. I do not vent the valve covers, nor do I run lines to the airfilters from the breather. Even at sustained high rpm I have no problem with oil leakage.

No, you can't run the return line from the filter to the block off plate. It has to go back into an oil gallery.

brad

pig-pen · Posted: Sun Jan 18, 2015 10:25 am Post subject:

perfect. thank you for your detailed and precise answer. exactly what I need. much appreciated.

txoval · Posted: Mon Jan 19, 2015 8:20 pm Post subject:

On the valve covers posted, does anything cover the end of the tube? Seems like trash could make its way up...maybe I'm overthinking it

pig-pen · Posted: Tue Jan 20, 2015 1:26 am Post subject:

or spiders

slalombuggy · Posted: Tue Jan 20, 2015 5:20 pm Post subject:

Zip tie some foam around it if you want. As the engine cools off after running the air inside contracts and will pull air from outside into the covers.


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