Slim air cleaner
2nd Gear
Joined: Jul 2012
Posts: 6
Likes: 0
From: WA State
The HiFlow 587 vents the hot oily air into the atmosphere via either the Breather Bolts that have dual mesh and dual foam filter inside the bolts.
(also available with the HiFlow 587 is the traditional hose and filter breather system)
The SE and the Ness BS both vent the hot oily air back into the engine via internal passageways built into their backplates. This is to satisfy the EPA, but it is NOT good for performance or for the engine.
Both the SE and the HiFlow 587 flow more air than your engine can use, so if you are happy with your tune right now, there is no need to change it when moving from the SE to the HiFlow.
(also available with the HiFlow 587 is the traditional hose and filter breather system)
The SE and the Ness BS both vent the hot oily air back into the engine via internal passageways built into their backplates. This is to satisfy the EPA, but it is NOT good for performance or for the engine.
Both the SE and the HiFlow 587 flow more air than your engine can use, so if you are happy with your tune right now, there is no need to change it when moving from the SE to the HiFlow.
No oil is being fed into the HiFlow Air Cleaner, so there is nothing to drip out or catch.
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Do NOT put solid bolts in your breather vent on the head. The engine must vent. If you plug those holes it will vent via blowing out a gasket.
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
The bolts on the Ness BS have a passageway in them that empties out into the backplate, venting the hot oily air into the air cleaner.
Do NOT put solid bolts in your breather vent on the head. The engine must vent. If you plug those holes it will vent via blowing out a gasket.
Do NOT put solid bolts in your breather vent on the head. The engine must vent. If you plug those holes it will vent via blowing out a gasket.
Not for the twinkies...only have the longer bolts for Sportsters and Evo's.
Stage III
Joined: Aug 2013
Posts: 3
Likes: 0
From: Austin
What is your opinion on the Roland Sands Design - Venturi Air Cleaner Speed 7 - Contrast Cut? Link: http://www.rolandsands.com/products/...7-Contrast-Cut
Road Captain
Joined: Oct 2011
Posts: 523
Likes: 1
From: kingston ontario
really? i thought it was just mesh and some foam... next time i think about it i will have to take mine apart.
haha, just noticed the date on this
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
You are correct. At work I use the compressed bead type but you are correct. Just a screen and foam. I posted before having one in hand.
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Tourer
Joined: Feb 2013
Posts: 294
Likes: 1
From: Tucson, AZ
What is your opinion on the Roland Sands Design - Venturi Air Cleaner Speed 7 - Contrast Cut? Link: http://www.rolandsands.com/products/...7-Contrast-Cut
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