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08-04-2015, 07:29 AM | #1 |
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Oil Breathers
Not to highjack another thread but I wondered what those small tubes I've seen from time to time on folks cars were:
http://www.mikes-afordable.com/product/A6764.html A nice example from :Y-Blockhead's car (USED without his permission but I think he's cool with it What are the main benefits of using one of these (yes a newbie question) I'm not smelling anything odd with my car.
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-Mike Late 31' Ford Model A Tudor, Miss Daisy I don't work on cars --I'm learning about my Model A. Cleveland, Ohio |
08-04-2015, 08:14 AM | #2 |
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Re: Oil Breathers
Mike
I have one of these on my car - been on it since I bought the car 22 years ago. In the Snyder's book it says it keeps the "engine compartment from looking like a pig pen." I don't know about that, but it seems to work for me. Marty |
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08-04-2015, 08:29 AM | #3 |
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Re: Oil Breathers
Vermin has one of those, but missing the tube. I'll sweat on a piece of flexible electrical conduit. Les' P.U. blow by was SO BAD, he ran that conduit clear to the BACK of his truck, for a trip to Canada!
Bill W.
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08-04-2015, 08:30 AM | #4 |
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Re: Oil Breathers
Would think you could hook up a PCV system to the valve cover into the carb and put a filter in the original cap and be less conspicuous than those huge breather tubes.
A PVC system would also keep the junk off of the bottom of the car as well. |
08-04-2015, 08:35 AM | #5 |
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Re: Oil Breathers
thats good if you dont need it..
it means you do not have excessive blowby from a worn motor |
08-04-2015, 09:59 AM | #6 |
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Re: Oil Breathers
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08-04-2015, 10:29 AM | #7 | |
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Re: Oil Breathers
Quote:
The theroy of a road draft tube is as the car is moving, air flowing across the end of the road draft tube causes a low pressure in the tube, to help draw out some of the nasty stuff that contaminates your oil. Combustion contaminates can lead to the formation of sludge. Road draft Tubes were used until the PCV system came along. Last edited by Y-Blockhead; 08-04-2015 at 11:08 AM. Reason: Add text... |
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08-04-2015, 01:01 PM | #8 |
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Re: Oil Breathers
I have an old Fumaze accessory that seems to work OK; when the car was purchased, it was stuffed with a copper scouring pad which seemed to block the blowby function and was removed.
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08-04-2015, 06:49 PM | #9 |
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Re: Oil Breathers
A fumy motor without one of those tubes will leave the engine compartment an oily mess. A sock over the filler tube works to stop it.
Also handy to wipe the dip stick on too.
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08-05-2015, 08:21 AM | #10 |
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Re: Oil Breathers
The copper scouring pad was recommended to me by Ora at Schwalms. It was a semi-blockage to allow fumes but not the oil to escape the crankcase. It seems that many minds have worked on the problem of the oil seeping out of the engine. It's a perennial problem.
Terry |
08-05-2015, 09:03 AM | #11 | |
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Re: Oil Breathers
Quote:
That's one of the advantages of having a Road Draft Tube is that it actually reduces crankcase pressure by drawing out the vapors (in theory). |
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08-05-2015, 09:12 AM | #12 |
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Re: Oil Breathers
I too have added the road draft tube. Believe it or not, a tight engine releases fumes when driving along. This accessory was well worth it to me.
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08-11-2015, 08:09 AM | #13 | |
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Re: Oil Breathers
Quote:
I'm surprised at how many seem to think a new "properly run in" engine has no blow by. They also all use some oil, though a good one will use very little. My two GM 1.4 turbos use less than I can detect on the stick in 10,000 miles but I'm sure they use some. They must or the compression rings wouldn't be lubricated. |
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08-11-2015, 08:22 AM | #14 | |
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Re: Oil Breathers
Quote:
Are you also saying you put 10,000 miles or more on an oil change? |
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08-11-2015, 08:29 AM | #15 | |
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Re: Oil Breathers
Quote:
Going by the car's oil life system and running Mobil 1 extended performance though, the computer doesn't know that but it makes me feel better. The computer assumes it's GM's synthetic blend. 99% highway miles, no short trips. On the "A" we don't see near that mileage though I am about to do a change on it using Mobil 1 0w40. It's lucky if it get's 100 miles on it's oil. |
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08-11-2015, 08:55 AM | #16 |
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Re: Oil Breathers
Also,it's not really just blow-by that makes the mess.The parts whipping around down there just throw oil all over the place.Ford made,what,three??four?? changes to the baffles in the filler tube before giving up.Those care didn't have blow-by so much when new as they just had oil droplets slung around.They finally semi-solved it with the bigger baffled filler tube on the B.You can also make your own road draft setup with an old road draft tube from a 283 Chevy.The baffled box fits right into the A filler tube,and you heat and bend the tube to go where you want it to.It might be hard finding one of those nowadays though.
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08-11-2015, 09:44 AM | #17 |
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Re: Oil Breathers
Hi Mike,
Here's another consideration: I have installed a "flame arrestor" (marine style) on my A with excellent results. It consists of a 1/2" breather tube installed on the valve galley cover, leading to the intake bore of the carburetor. The tube runs in back of the carburetor, and is barely visible. It sucks all crankcase vapors into the carb intake and burns them in the combustion process. It keeps the engine compartment clean, and it helps to cool the engine by removing hot gases from the crankcase. This is not a solution for a "dirty" motor, but it the best thing since sliced bread for a clean one. Happy Motoring! |
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