engine breather catch can
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,603
Likes: 3,374
From: Cental, MI
But... Putting a vacuum pump on the Bottom End does Increase Horsepower...welp...actually, it lessens the parasitic losses!!
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Stellar HDF Member
Joined: Mar 2017
Posts: 2,596
Likes: 2,172
From: australia
When you figure out how to Measure any Vacuum in the case, without a "Pump" please Tell about it..
No Way I obstruct the Breather, in Any Way.. May as well just plumb the breather into the Back side of your S&S air Box (look at those Threaded Holes that have Plastic plugs in them)!! Best way to Pass, and keep the Crankcase Well Ventilated.. (close as yer gonna get to a Vacuum) When done with testing .. Remove the line and drop it to the ground...and Stick Plastic plug in back of Air Cleaner!!! If you think Yer engine is Blowing excess Oil out Breather...Which generally indicates a Problem...Starting with Too Much Oil in Tank...and Progressing to Bad Ring Seal!! A drop here and there at Most...
No Way I obstruct the Breather, in Any Way.. May as well just plumb the breather into the Back side of your S&S air Box (look at those Threaded Holes that have Plastic plugs in them)!! Best way to Pass, and keep the Crankcase Well Ventilated.. (close as yer gonna get to a Vacuum) When done with testing .. Remove the line and drop it to the ground...and Stick Plastic plug in back of Air Cleaner!!! If you think Yer engine is Blowing excess Oil out Breather...Which generally indicates a Problem...Starting with Too Much Oil in Tank...and Progressing to Bad Ring Seal!! A drop here and there at Most...
I fitted this type of PCV taking the advice of johnjzjz when the bike had 8000 miles on the odo It now has 18000 miles and doing the service last week i unscrewed it to check the rubbery umbrella valve and all was good and very clean inside no oil build up at all and i would recommend fitting one to a shovel as my motor does not leak or weep any oil at all. So much so that i fitted a PCV to my Matchless G15 which is a factory norton matchless hybrid with a 750 norton atlas motor ,matchless frame and got the same results, no oil drips from breather hose and an oil tight motor. Unfortunately the backing pate on my S&S carb doesn't have the hole in it for the breather hose so iam thinking of purchasing the catch can and if my bike does get summoned for inspection i will then fit it.for the inspection..... Many thanks to your insight gentlemen
Seasoned HDF Member
Joined: May 2008
Posts: 21,173
Likes: 12,740
From: South Carolina
The breather gear closes the breather when the pistons are on the upstroke.
No need for anything on the breather tube (except of course to keep it legal).
Would an inspector even know what to look for in a breather setup?
No need for anything on the breather tube (except of course to keep it legal).
Would an inspector even know what to look for in a breather setup?
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Stellar HDF Member
Joined: Mar 2017
Posts: 2,596
Likes: 2,172
From: australia
[QUOTE=Dan89FLSTC;22258544
Would an inspector even know what to look for in a breather setup?[/QUOTE]
I typed into google about the 1982 flh and the breather gear and it came up with reference to NSW EPA about the breather being plumbed into the airbox so i would imagine they would be on top of it. Generally our Australian Design Rules exempt motorcycles from engine emissions ADRs mainly i suppose because the fuel tanks are gravity fed and rely on a vented fuel cap as well as being oil cooled but if its been fitted from the factory it shouldn't be removed. .....silly really because the bike has a rear chain oiler which i use as its nigh on impossible to use a can of chain lube with the big chain guard and bags attached when Iam out and about in the countyside
Would an inspector even know what to look for in a breather setup?[/QUOTE]
I typed into google about the 1982 flh and the breather gear and it came up with reference to NSW EPA about the breather being plumbed into the airbox so i would imagine they would be on top of it. Generally our Australian Design Rules exempt motorcycles from engine emissions ADRs mainly i suppose because the fuel tanks are gravity fed and rely on a vented fuel cap as well as being oil cooled but if its been fitted from the factory it shouldn't be removed. .....silly really because the bike has a rear chain oiler which i use as its nigh on impossible to use a can of chain lube with the big chain guard and bags attached when Iam out and about in the countyside
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,603
Likes: 3,374
From: Cental, MI
I fitted this type of PCV taking the advice of johnjzjz when the bike had 8000 miles on the odo It now has 18000 miles and doing the service last week i unscrewed it to check the rubbery umbrella valve and all was good and very clean inside no oil build up at all and i would recommend fitting one to a shovel as my motor does not leak or weep any oil at all. So much so that i fitted a PCV to my Matchless G15 which is a factory norton matchless hybrid with a 750 norton atlas motor ,matchless frame and got the same results, no oil drips from breather hose and an oil tight motor. Unfortunately the backing pate on my S&S carb doesn't have the hole in it for the breather hose so iam thinking of purchasing the catch can and if my bike does get summoned for inspection i will then fit it.for the inspection..... Many thanks to your insight gentlemen
Advanced
Joined: Apr 2024
Posts: 65
Likes: 51
From: Darwin
I fitted this type of PCV taking the advice of johnjzjz when the bike had 8000 miles on the odo It now has 18000 miles and doing the service last week i unscrewed it to check the rubbery umbrella valve and all was good and very clean inside no oil build up at all and i would recommend fitting one to a shovel as my motor does not leak or weep any oil at all. So much so that i fitted a PCV to my Matchless G15 which is a factory norton matchless hybrid with a 750 norton atlas motor ,matchless frame and got the same results, no oil drips from breather hose and an oil tight motor. Unfortunately the backing pate on my S&S carb doesn't have the hole in it for the breather hose so iam thinking of purchasing the catch can and if my bike does get summoned for inspection i will then fit it.for the inspection..... Many thanks to your insight gentlemen
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Stellar HDF Member
Joined: Mar 2017
Posts: 2,596
Likes: 2,172
From: australia
yes .....Transport NSW who runs and sets rules for historic and classic rego called in 85 vehicles for 5 clubs in Sydney recently ...46 vehicles inspected,25 defect notices issued,16 vehicles identified with major defects including 6 deemed unsafe to drive from inspection site 19 vehicles deemed ineligible for historic or classic vehicle scheme and enforcement action is underway to cancel registration of 39 who failed to comply with the inspection direction, they didn't show up. Two club officials who are also authorised examiners with AIS (nsw pink slips ) have been referred for action against their AIS accreditation... All of these were cars, mainly idiots that rort the system...ie there was a photo of a 1965 rover with a bonnet scoop LOL it was even facing the wrong way They slapped a defect notice on the windscreen
.....so basically the historic rego is for vehicles that are 30 yrs old and have no modifications ie stock as they left the factory and classic is for vehicles that have permissible modifications or allowed modifications that have an engineers report.
.....so basically the historic rego is for vehicles that are 30 yrs old and have no modifications ie stock as they left the factory and classic is for vehicles that have permissible modifications or allowed modifications that have an engineers report.Last edited by old mago; Apr 14, 2026 at 11:02 PM.
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Joined: Apr 2024
Posts: 65
Likes: 51
From: Darwin
yes .....Transport NSW who runs and sets rules for historic and classic rego called in 85 vehicles for 5 clubs in Sydney recently ...46 vehicles inspected,25 defect notices issued,16 vehicles identified with major defects including 6 deemed unsafe to drive from inspection site 19 vehicles deemed ineligible for historic or classic vehicle scheme and enforcement action is underway to cancel registration of 39 who failed to comply with the inspection direction, they didn't show up. Two club officials who are also authorised examiners with AIS (nsw pink slips ) have been referred for action against their AIS accreditation... All of these were cars, mainly idiots that rort the system...ie there was a photo of a 1965 rover with a bonnet scoop LOL it was even facing the wrong way They slapped a defect notice on the windscreen.....so basically the historic rego is for vehicles that are 30 yrs old and have no modifications ie stock as they left the factory and classic is for vehicles that have permissible modifications or allowed modifications that have an engineers report.
.....so basically the historic rego is for vehicles that are 30 yrs old and have no modifications ie stock as they left the factory and classic is for vehicles that have permissible modifications or allowed modifications that have an engineers report.
Road Master
Joined: Feb 2010
Posts: 1,191
Likes: 574
No offense to our Australian brothers but that sounds like a totalitarian state. No such thing here. Where I live we dont even have vehicle inspections of any kind. Once you get your special purpose or antique plate, youre done. No annual registration fee either.
