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Air filter for featherbed twin

Submitted by alan_throssell on Wed, 13/12/2017
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Heavy Twins

Iâve seen several postings asking about filters for featherbed Dominators so here is the filter I fitted to mine. I donât know who made it. I acquired it as ânew old stockâ. It bolts directly to the studs on the inside face of the oil tank. It fits neatly between the oil tank and battery box. I bought an old car type filter of the correct depth, then cut it to fit. Please see pictures.

Attachments air-filter-box-jpg

Submitted by robert_tuck on Wed, 13/12/2017

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Its sold by Norville, It requires an adaptor ring for the carb and a rubber connector plus it needs painting and a filter which you have to fashion yourself. I had to redrill the mounting holes to match the tank. In cutting the filter you lose much of its integrity which I managed to regain by forming a seal on the cut side with setting silicon on the cut edge and greasing the box cover. I cant imagine any of it would be possible with the battery box in the way. Can be a really tight fit on the oil tank flange.May need the clutch cable to be longer. May need some rejetting if already a bit rich. Not a cheap option or easy fix. Good photo's Alan, Make sure it all fits together before bolting it in otherwise its a struggle.Advise loctite on the loose studs as they could find their way into engine if all comes loose.

Submitted by alan_throssell on Wed, 13/12/2017

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Nothing is ever easy in this game!

The filter I used fitted in just perfect (pictured). It's only cut at the ends, the filters orange rubbers, seal to the filter housing side plates, the cut ends are tight against the metal so no need for any silicone sealant or grease. My carb needed no re-jetting.

I doubt it originally came from Norville. I remember it came with a paper filter in it that was so old it just crumbled to the touch. It might be that Norville have copied this design?

Submitted by bob_matthews on Wed, 13/12/2017

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Here's my air box and filter.

I got the box from the spares scheme and I used a filter from an early Austin Mini, cut in half it makes two. I also didn't need to re-jet and there's the peace of mind that the engine is breathing clean air. My engine is on +60 and seeing as the availability of barrels is like finding hen's teeth, I don't want to be seeing scored bores that you often find on engines that have done as little as 10k miles.

I used a carb bellmouth with the flared end cut off and a silicone rubber hose of two differing diameters to join the filter box to the carb.

https://s20.postimg.org/6pvlwt065/IMG_1400.jpg

https://s20.postimg.org/t1teq6jul/IMG_1437.jpg

Submitted by paul_standeven on Thu, 14/12/2017

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The air filter shown is the type fitted to late '50s widelines, from 1956 or '7 on. Mine has teh exposed battery, and needs an adaptor on the carb inlet instead of the open bell-mouth, and a flat external filter

Paul

 


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