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johnshenry Samba Member
Joined: September 21, 2001 Posts: 9364 Location: Northwood, NH USA
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Posted: Mon Jul 28, 2008 9:14 am Post subject: Vented valve covers... |
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Anybody run them on 25/36hp engines? My old '50 engine (actually a '52) used to throw a bit of oil from behind the pulley, but compression was good, so I have no reason to suspect worn rings/blow-by.
I have a set of NOS ones and was thinking about putting them on my new '50 engine. Hopefully keep the engine bay a little cleaner?
I know there is wisdom that says that if you are slinging oil, you have other problems, and venting is just a band-aid (sort of like 8 volt batteries, but don't get me started on that....). True for 25 hp engines? I would think there is plenty of venting already around the loose oil fill thingy.
It didn't sling that much, just a light oily coating under the lid, and that is doing 1000-1500 mi/yr.
Thoughts?? _________________ John Henry
'57 Deluxe
'56 Single Cab |
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VWwerks Samba Member
Joined: March 07, 2002 Posts: 207 Location: Wisconsin
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Posted: Mon Jul 28, 2008 9:54 am Post subject: |
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Pull the oil pressure relief piston out and clean it, it could be sticking a bit. I bead blast them and then give it a little polish on the buffer. You could also use a plastic brissle brush to clean out the bore. I found about 95% of the time if there is oil going past the pulley it's the relief valve sticking. |
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Blue Baron VW Aficionado
Joined: June 16, 2006 Posts: 24119 Location: Southeast USA
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Posted: Mon Jul 28, 2008 2:27 pm Post subject: Re: Vented valve covers... |
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johnshenry wrote: |
Anybody run them on 25/36hp engines? My old '50 engine (actually a '52) used to throw a bit of oil from behind the pulley, but compression was good, so I have no reason to suspect worn rings/blow-by. |
Oh yeah? I have a '50 engine in my '52 standard. Wanna trade? |
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Zwitterkafer Samba Member
Joined: November 17, 2007 Posts: 879 Location: Lanark County, Ontario, Canada
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Posted: Mon Jul 28, 2008 3:58 pm Post subject: |
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A friend of mine had a factory rebuilt engine sling oil from the pulley.....enough to give an obvious oil stripe on the back of the decklid. The VW dealer looked it over and was baffled; all seemed fine and like new. One day, the problem went away all by itself. All we could think of was that something was blocking the oil return thread on the crank pulley, or perhaps the oil drain passage in the block near the pulley had been partially obstructed by case sealant or other foreign matter.
Maybe the vented valve covers were a measure that dates to about Jan '54; the higher compression ratio (relative to 25hp) of the earliest 36hp engines might have caused a few more pulley oil leaks. It would not surprise me if modifications to the windows in the webs of the crankcase halves were part of the eventual fix, the valve covers being a band-aid solution. Can't see any harm in trying 'em......
H. _________________ "Criticism comes easier than Craftsmanship"
- Zeuxius, 400 BC |
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sgmalt46 Samba Member
Joined: April 20, 2005 Posts: 1296 Location: south san francisco
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Posted: Mon Jul 28, 2008 6:13 pm Post subject: |
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i say run them. i did on my 55 bus and is does help! they offered it as an option for bus owners . it's in the 55 bus workshop manual. probably cuz in a bus your tacking the hell out of it to make it keep up with traffic!! i know i do!
steve |
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johnshenry Samba Member
Joined: September 21, 2001 Posts: 9364 Location: Northwood, NH USA
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Posted: Mon Jul 28, 2008 8:00 pm Post subject: Re: Vented valve covers... |
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Blue Baron wrote: |
johnshenry wrote: |
Anybody run them on 25/36hp engines? My old '50 engine (actually a '52) used to throw a bit of oil from behind the pulley, but compression was good, so I have no reason to suspect worn rings/blow-by. |
Oh yeah? I have a '50 engine in my '52 standard. Wanna trade? |
You are about 8 months too late Greg.
I traded with a guy in CA for a rebuilt 25hp long block that was 293 numbers off the engine that was in my car from the factory! I traded him my March '52 engine (and some other stuff) for it. Just turned out he had a March '52 'vert with the wrong engine....!! _________________ John Henry
'57 Deluxe
'56 Single Cab |
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coolairX2 Samba Member
Joined: September 08, 2003 Posts: 478
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Posted: Tue Jul 29, 2008 6:36 pm Post subject: Vented valve covers |
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I run them on my Ghia which with the Judson installed it was pushing oil out from behind the pulley. Once I installed the vented valve covers it stopped the oil being pushed out due to the high crank pressure. The CR of the 36hp with the Judson I believe was leaking pressure past the rings and building crankcase pressure.
Now with the Okrasa I installed total seal rings to guarantee no blow-by and it has a seal machined into the case instead of an oil sling. It is dry as a bone with no blow-by at all.
-Craig |
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53 0val Samba Professor
Joined: July 03, 2003 Posts: 11396 Location: Irvine, CA
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Posted: Tue Jul 29, 2008 10:42 pm Post subject: |
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I run them on my '53 and have for years. They were an original 25 hp accessory, although I have seen great reproductions. I got my original pair from Steve Heron. I bought another pair from Eric Meyer, I believe. (correct me if I'm wrong Eric ) _________________ "What a fool believes he sees, no wise man has the power to reason away." Dobee, Dobee, Do |
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Peter_Plade Samba Member
Joined: January 09, 2005 Posts: 551 Location: Denmark
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Posted: Tue Jul 29, 2008 11:23 pm Post subject: |
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I made set of my own (it is showed howto make them, in my original 1954 workshop manual) and put them on while running the Judson.
Now I just run them on a stock engine, and they work fine. _________________ http://vw-bluehats.blogspot.com/ |
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ZwitterND Samba Member
Joined: September 08, 2005 Posts: 1451 Location: Fargo, ND
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Posted: Wed Jul 30, 2008 5:58 am Post subject: |
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Ok now you got me curious, anyone got a picture of a vented valve cover? _________________ Bill |
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EverettB Administrator
Joined: April 11, 2000 Posts: 69827 Location: Phoenix Metro
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Fred Udog Samba Member
Joined: November 06, 2004 Posts: 372
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Posted: Wed Jul 30, 2008 11:29 am Post subject: |
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I've same on my 25hp :
Fred |
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oval56 Samba Member
Joined: July 21, 2003 Posts: 1309 Location: oktoberfest maintown
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Posted: Thu Aug 07, 2008 12:57 am Post subject: |
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selv made like vw :
how to on my website (bottom):
http://www.oval56.de/inhalt3.html _________________ www.oval56.com
1956 Oval, 2364ccm typ4
1957 Oval Ragtop 1584ccm singel port modified
1950 Hebmüller, 1584ccm okrasa modified
DBK Germany!!!!!!!!!!
www.dbkvw.com |
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VWwerks Samba Member
Joined: March 07, 2002 Posts: 207 Location: Wisconsin
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Posted: Fri Aug 08, 2008 1:13 pm Post subject: |
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You don't need them in a stock motor, especially a 25hp, if the pressure relief valve is working correctly. |
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tazm Samba Member
Joined: June 10, 2001 Posts: 530 Location: Belgium
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Posted: Wed Oct 29, 2008 1:20 am Post subject: |
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I made a few sets from these Thanks ABP Tuning for te samples and the Original drawing , I've bin told that VW wrote a note to All VW dealers , how to prevent oil leaks by using these covers
Guido |
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pig-pen Samba Member
Joined: December 04, 2012 Posts: 570 Location: United Kingdom
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Posted: Sat Apr 19, 2014 2:42 am Post subject: |
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hello all.
Does anyone know of a source for a taller vented valve cover for a 36hp? I am going to be using Speedwell 1.25:1 rockers so need a little more space (or do I?) and a bit of venting.
Would these rockers go under a normal cover with some 'persuasion?'... if so I will go a head and braze in a copper pipe as above....
any help appreciated as always. |
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slalombuggy Samba Member
Joined: July 17, 2010 Posts: 9147 Location: Canada
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Posted: Sun Apr 20, 2014 8:40 pm Post subject: |
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I am building a set for Todd for his big motor. I had to cut the valve cover and lift the bottom half of it aound 8mm I think. I cut it from the recess in the middle down around the bottom just after it curves and welded in a strip of metal. If I go there tomorrow night I'll ake a pic of the one I finsihed. I got hurt a couple of days after I finished the first one and haven't gotten to the second one. I don't think you can stretch the stock coverenough to make room for the 1.25s
brad |
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pig-pen Samba Member
Joined: December 04, 2012 Posts: 570 Location: United Kingdom
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Posted: Mon Apr 21, 2014 3:42 am Post subject: |
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sounds good, a nice easy solution, plus a longer clip I guess? |
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Roadcow Samba Member
Joined: November 14, 2003 Posts: 1012 Location: Stockton, Ca. area
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Posted: Mon Apr 21, 2014 8:52 am Post subject: |
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Just weld spoons like Tom did. _________________ 71 Westy Roadcow
67 Panel
63 Bug
66 Ghia Bonneville 2014
74 Ghia Vert
69 Bonneville Ghia 150 in Chico
69 Bonneville Ghia in Ireland
80 Cabby 2.1 16v
98 Passat |
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slalombuggy Samba Member
Joined: July 17, 2010 Posts: 9147 Location: Canada
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Posted: Mon Apr 21, 2014 1:20 pm Post subject: |
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pig-pen wrote: |
sounds good, a nice easy solution, plus a longer clip I guess? |
Stock clips will work. I only raised the bottom half of the cover. I used the groove for the bail as the bending point.
brad |
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