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Oil breather pipe to air filter

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t_tuffnut Wolfsburg Wizard

425 posts · joined Jun 2009 ·

#783237
Quick question,

I replaced the oil bath on my 1300 bug with an empi sponge filter. The new air filter had a bit to connect it to the oil breather tube built into it.

Just wondering why? I've seen other engines that have changed to sponge filters and have redirected the oil breather tube down and out of the engine bay.

Wouldn't the breather tube carry oil up into the sponge and clog it? I've also seen other engine bays where it has been connected, but I can not see the advantage of doing so.

But hey, I'm no expert - so I thought i'd consult you guys.

Thanks
1966 Bug

1973 L Bug

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 ·

#783241
Hi

If your car was built after 1973 its an ADR not to have crankcase fumes going to the atmosphere. If its an earlier model just put the fumes out the tube where they normally come out.

Steve

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#783244
the breather tube adds the vacumn to the crankcase..........very important to stop oil leaks as without pressure builds and oil spills 👍

t_tuffnut Wolfsburg Wizard

425 posts · joined Jun 2009 ·

#783248
Mine is a 1966, so it should be fine to have the fumes exit the vehicle through a pipe and out the bottom?

Do I even need to extend the tube past the oil filler?
1966 Bug

1973 L Bug

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 ·

#783276
put the oil vent back to the air cleaner wont hurt it
I read it on FACEBOOK so it must be true


http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630


http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099


http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603


http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#783286
t_tuffnut wrote:Quick question,

I replaced the oil bath on my 1300 bug with an empi sponge filter. The new air filter had a bit to connect it to the oil breather tube built into it.

Just wondering why? I've seen other engines that have changed to sponge filters and have redirected the oil breather tube down and out of the engine bay.

Wouldn't the breather tube carry oil up into the sponge and clog it? I've also seen other engine bays where it has been connected, but I can not see the advantage of doing so.

But hey, I'm no expert - so I thought i'd consult you guys.

Thanks

Hi
the hose up to the air cleaner causes a vacuum in the hose sucking up vapours from the engine crankcase.

I also found it will suck up some oily vapours into the foam which made the foam air element partly oily and not good for an air filter.. [unless a K&N]

I did put a smaller piece of hose into the larger hose going to the air filter to try to stop any oil getting onto the foam..
this did seem to work OK...

but I decided to go back to the original VW oil bath air filter..

excess oil in the hose is supposed to go downwards thru the other hose or pipe..

If both these hoses are blocked...

oil will come out of the dipstick hole plus from around the crankshaft pulley...

You will find most old original VW engine bays will have an oily feel to them all over the engine bay...

so, some oil vapour does escape out past the oil slinger on the crankshaft behind the large pulley...
even in a standard VW beetle..

LEE


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