Thinking about air cleaners.

"Berang" (berang) 04/21/2019 at 05:06 • Filed to: None

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Thinking about finding an oil-bath filter for the Bajaab. Then noticed this centrifugal pre-filter for a Farmall Cub. These are pretty cool. They’re still used on tractors and trucks today, although they look a lot different now.

The method of operation is pretty simple. The air is drawn through the louvers on the bottom, which being arranged in a circle, spin the air. The dirt in the air is spun the outside of the filter, and collects in the “dead” air of the jar. The clean air continues down the intake stack and into the air filter. The centrifugal filter gets the bigger particles out of the air so they won’t clog the main air filter up fast. Here’s a patent drawing:

Modern ones work on the same principle but are more efficient I assume - at least they can trap a lot more dirt before they need to be cleaned out.

As for the oil bath filters... I was seeing if I could find one of the heavy duty ones for a VW Thing, but man, are those expensive! Given how few VW people run them, I wouldn’t have thought they’d be worth much. Also looking at Mercedes units, but again, pricey. Most car-style ones won’t fit on the Saab because there is not enough space over  the engine, so I’ve been looking for models that mount to the side of the engine.

Also looked at tractor and truck units, but most would take up too much space under the hood, or be too restrictive (the Farmall Cub units are small, but those only needed to move enough air for a one liter engine).

pip bip - choose Corrour > Berang 04/21/2019 at 06:11

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build a snorkel perhaps?

cbell04 > Berang 04/21/2019 at 09:53

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Im of no help here but I learned something so thanks! 

Duck Duck Grey Duck FTMFW! > Berang 04/21/2019 at 09:54

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That is so cool!!! I have always wondered why Farma lls had that ball jar in there. Such a clever design. What about an oil bath filter from a 50's Chevy pickup?

shop-teacher > Berang 04/21/2019 at 11:15

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Oh man, that's pretty cool!

lone_liberal > Berang 04/21/2019 at 11:53

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Some American cars in the 50s had low profile oil bath cleaners. I’m sure they’re being reproduced but I’m equally sure they aren’t cheap.

MiniGTI - now with XJ6 > Berang 04/21/2019 at 12:32

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Cue Dyson…

Berang > Duck Duck Grey Duck FTMFW! 04/22/2019 at 03:17

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Most of those are way too huge to fit under the hood.

The Saab only has about 4" of space between the top of the carb and the bottom of the hood. And interesting thing about these old American ones is that most of the hugeness is just air - the bulk of this one for instance is hollow, to muffle induction noise.

Berang > pip bip - choose Corrour 04/22/2019 at 03:26

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No snorkels because they’re silly. Plus if I ever re-route the exhaust over the roof like the factory Baja cars, it’d be in the way.

pip bip - choose Corrour > Berang 04/22/2019 at 03:31

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bolt the snorkel to the exhaust?

just a thought.

:)

Berang > pip bip - choose Corrour 04/22/2019 at 12:11

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S norkel BAD.