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Old 06-25-2016, 09:41 AM
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Default Air Filter

I hope I have learned.My car started to backfire and run rich.Sooted plugs and exhaust stinking of petrol.The backfire blew my driver-side muffler apart.It would not idle and would stall, so realistically became undriveable.I went through the route of dismantling the carburetor,cleaning the components and blowing the passages out.Then I realised via web-browsing....a clogged air filter.Now a $6 component has given me back my smooth running V8

The good points are that I enjoy dismantling an Autolite, and that I now have the correct air-filter(the clogged item did not have the wider rim on the top surface so may not have been sealing as well as it should)

The clogged air-filter was a new item circa 3000 miles ago.Presumably having the oil breather diverting back into the air cleaner silencer makes filter replacement a more frequent requirement

Last edited by newyear : 06-25-2016 at 03:05 PM.
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Old 06-25-2016, 10:41 AM
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Peter thanks for the post for our users.Sometimes the smaller items are the cure n the bigger picture. Web browser is a good thing along with our TRL section on the site. Good stuff
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Old 06-25-2016, 12:48 PM
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Peter, your new PCV may have a breathing problem but it's hard to tell from this side of the pond...

The idea of using positive crankcase ventilation is grand but it must be done correctly. If you simply stick a vacuum tube into your engine it will certainly draw the smelly fumes into the air filter BUT...

You should use two valve cover 'vents', one on each side of the engine. One draws fresh air into your engine while the other is connected to your air cleaner as it acts like a vacuum cleaner.

If you only have the one, it will promote excessive blowby at the bottom of your engine. Oil in the mist will have no chance of settling on internal engine parts like the timing chain.

So, a properly done PCV will draw fresh air in one side, through the engine to the other side, and pick up some blowby before going into your air cleaner. This air should never clog your air cleaner with oil.

There is one exception:
If your blowby is too much because of worn out rings and cylinders, no amount of ventilation will help. This condition can only be remedied with an engine overhaul. Hope this helps. - Dave
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Old 06-25-2016, 03:04 PM
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Hi Dave
Something else I had not realised and thought was a factory setup was that my car has a hose connection between the air-cleaner and the oil filler/breather cap.I have looked through my pictures of Squarebird engines and can only see one other example of this.I don’t think that my oil consumption has worsened but will keep an eye on it.In view of your advice re lubrication it may be a better bet to disconnect it
Thank you
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Old 06-30-2016, 05:53 PM
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Peter, your car has had a PCV conversion done. These Squarebirds had a road draft tube originally that vented the crankcase gases....

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Old 06-30-2016, 11:30 PM
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Would it not be a good idea to put an oil catch can into the line before it enters the air filter housing?
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Old 07-01-2016, 10:14 AM
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My engine has the standard road draft tube setup which vents into the atmosphere under the car so I presume that the hose from breather to air cleaner was a basic attempt to recycle the oil mist.I have no knowledge of my engine ever having had a more elaborate setup than that.

I have disconnected the hose from breather to air filter and will see if I can setup a catch bottle to gauge the amount of oil mist.The PCV setup described in the Technical Resource Library looks like the way to go unless an engine rebuild is required-Yikes!

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Old 07-01-2016, 12:39 PM
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Having only the single hose from the valve cover to air cleaner and retaining the road draft tube would not be correct, nor acquire the proper effect of efficiently drafting the crankcase. Worst, any value received would reverse the air flow (the tube to the air cleaner should be the high pressure side), and therefore you would be vacuuming particulate up (from the road) the draft tube into the crankcase.

If you wish to create a P.C.V. system vs the original "open" system, follow the description/outline in this forms Tech. Resources posting, use the optional/second listed procedure, as it would not be recommend to "tee" the P.V.C. valve with the brake booster vacuum source. Scott.
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