vent crankcase to carb

[mcmscott]

[nextgen]

My dad has been gone for many years and he gave me my first car back in 1965 a 1956 Buick Special V8. It had a massive blowby problem it smoked out the tail pipe really bad.

His fix was Garden Hose from holes he made in each Valve Cover to the 4 barrel Carb. Amazingly the tail pipe smoke was gone. I guess it sucked it out the crankcase so it could not get into the cylinders.

Not PVC RUBBER ha. Sprinkler stuff, ha.
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[ALANSD]

old thread revived;

I am adding a breather box to my 1835 engine.. I have the box , sponge foam insert and two vents. I need to know I am doing it right- drill the front of the right side valve cover..run two hoses to the box. Anything else?

[Skulptorchaz]

Alan,
I'm doing this too so I will be interested to see.
MY understanding is two vents, forward top of valve covers, up to box and hose from tower up to box. Seems like a lot of dang hoses tho. Maybe there is a trick??

[Dr OnHolliday]

I dunno - my daily driver has had a 1/2" vent hose directly to the bottom of the air cleaner for 50k miles now. I have run similar setups on American engines for long periods.

I have never seen any problem, partially because the vent hose typically runs uphill so that liquid oil isn't run thru the carb, only oil mist (velocity of air flow not sufficient to carry liquid oil uphill), and any liquid oil drains back to the crankcase.

There used to be aftermarket kits to inject oil such as Marvel Mystery Oil into the intake system, to purportedly lube valve stems and rings. I never heard any negative feedback, other than questions about its true effectiveness...
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1965 Type 1 sunroof Baja / about 70k miles on self-rebuilt '74 1600 and counting / SP heads and aftermarket valve keepers / non-doghouse shroud with external cooler and filter / 1.5 qt extended sump / Weber 32/36 DFAV progressive carb / 009 dist with Pertronix / 1.25 ratio rockers and ball adjusters / 1.5" stainless steel J-pipes and carbon steel baja exhaust

[SamT]

You'll be fine running it through the carb. If your sucking heavy oil mist you have other bigger problems. It will dirty your air cleaner some, more as your engine gets tired.

I ditched my breather box after a line came off and sand got in it. The samba will tell you to use AN fittings and braided hose, but that cost more than a new set of jugs and rings.

Lots of overthinking around here. If you built an engine everyone here though was perfect you could build 3 good motors with the same money.
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[vw moses]

i don't get any "oily mist" in my carbs

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[SBD]

[vw moses]

well to be clear in my case, i got new rings, plus honed the clynders.
on a older mtr. with a lot of bloback it might not be a good idea espically if smoke comes out the crankase vent tube.
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Youtube@vw moses
73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[SBD]

[vw moses]

i don't mind some micro oil particles getting to the valves.
sort of like having a marvel mystery oil injection system'.
of course in moderation!
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Youtube@vw moses
73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[ALANSD]

[Howard 111]

I run a turbo/FI system, and because the entire intake system is under pressure during boost, I run a breather box. And even running a NA system, I always use a breather box. I don't like the idea of an oily mist of air, entering the intake anywhere.

A breather box is cheap, and easy to plumb.
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[oldschool5er]

I always used to run both valve cover's and Gen stand to a breather box with drain back, basically for the last 40 years. But I switched as an experiment on some big motors to 3/4" ID from Alt stand and case to a vented catch can with no drain back. I drain a few tablespoons out of it every 500 miles or more because I do not want it going back to the motor with a drain back. I have found no need to even drain it that often even with occasional blasts up to 7k. I have found though if you mount a poor breather box on the firewall even with drain back, you just might forget to do a PM on it and in turn it will pay you back with oil coming out and being sucked up by the fan and blown all over your motor. This sometimes results in instant smokebombs for your fellow travelers driving behind you and perpetuates the myth of old vw's being oil leakers.

[Eaallred]

I vent to the exhaust on my HP engines with a v-8 style crankcase evac system. Works well as long as you use a straight through style muffler. I built my dad's turbo setup to use no breather box, and went to the exhaust for venting. Worked very well, he drove it from Elko, NV to Sacramento, CA on the highway without any issues. Kept the engine bay nice and tidy as well.

I only vent out the alternator stand, I leave the valve covers alone.

On my black car, I run a vacuum pump. I have a valves automatically drain the catch can back to the engine and pump bypassed when rpm and throttle go below a preset limit. Works well, allowing me to run a vacuum pump system on the street without starving the rings of oil during normal operation causing undue wear. The catch can itself acts as the breather during normal operation and just vents to atmosphere normally.
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[Jay Laifman]

FWIW, in the Porsche 356 and 912 world, people feel pretty strongly that venting to the air cleaners is beneficial to the engine by reducing pressure in the case.

[dsrtfox]

I always thought they went from the road tube to the air cleaner because of some kind of EPA crap.

[Jay Laifman]

That is probably true. But I think people tend to miss the point of that tube. I see some people say that it is a "down pipe". But another phrase for it is "draft tube." The point being that the tube is below the engine and as the car is moving, air is flowing under the car, which creates a suction in the pipe. This has an increased pull of the pressure out of the crank case.

That's what the hoses to the carbs are supposed to do.

I see lots of folks using catch cans and breather boxes that have no additional source of suction. I don't see how adding a couple feet of hoses and a small container, even with an opening to the atmosphere, equates to the suction caused by the *draft* tube or carbs.

I guess it is a question of just how much reduction in pressure someone wants in their case. I do not know of studies that show how much is needed to really make a difference on the performance and longevity of hte engine.