Crankcase Vent Help

[69’nDAN]

Is there a better way to route my crankcase ventilation? Worried that this configuration will make a mess.
Thanks

[SGKent]

I would try to keep the hose going downhill back to the breather at all times so any oil that gets in the line goes back downhill Make sure there is a flame trap in the setup to prevent a backfire from blowing up the crankcase. CO, unburnt HC and O2 can be explosive. A better option would be to collect a working oil bath air cleaner.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[richparker]

Run the hose on top of the alternator between the carb and the fan housing. Although I’ve run breathers on the bottom of the air cleaner before, I prefer the top.
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[busdaddy]

So many things in that pic say "it's going to run like ass", lousy aircleaner with no preheat or noise abatement, vacuum advance hose on wrong port, chrome alternator pulley, just to name a few, aye yae yae!
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[aeromech]

As Steve said… the way you’ve laid out that breather hose, it will eventually fill up with trapped oil and stop working.

Also, x 2 on getting an original air filter
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Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
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[Wildthings]

You fancy after market oil filler/crankcase breather greatly restricts the passage of the blowby gases resulting in increased crankcase pressure, the original style functions much better.

[aeromech]

Yes. Go back to an original breather vent to avoid oil leaks due to increased breather pressure
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[SGKent]

don't forget to install the rest of the tin either if you want a cool running engine.
_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[aeromech]

Here’s the deal. If you pull the breather hose off your oil filler spout and look at the inside diameter of the fitting the hose is connected to, you will most likely find that it’s substantially smaller than the original breather port. This reduces flow and increases breather pressure which in turn creates oil leaks. Ask me how I know?
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Wildthings]

[metahacker]

[richparker]

Both of my ACVWs are vented like this and I don’t have any issues with excessive oil consumption or leaks.
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’71 Westy build
Adventure thread
’65 Deluxe Build
’63 Deluxe Build

[metahacker]

your engines sound like they are well put together with nice ring seal

let me take the bus on a couple road trips i can fix that pretty quickly :)

[SGKent]

the pads etc are a flame trap. That is their main purpose. If a backfire happens, it prevents the flame from reaching the crankcase. You throw it away when it gets cruddy and restricts flow.


Here is one you might find in a typical air cleaner

_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[richparker]

[69’nDAN]

Sounds like without installing the original air cleaner/oil bath, that my best option would be to...
-keep the breather hose on a downhill slope towards the oil filler.
-install a flame arrestor in the oil filler against the baffles.
-bore out the current oil filler fitting to a 3/4" NPT to limit flow restriction.

Thanks everyone for the insight!

[69’nDAN]

[69’nDAN]

[69’nDAN]

[Wildthings]