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Jun 14th, 2026
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Joined: Aug 2009
Posts: 557
Talk Morgan Regular
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OP
Talk Morgan Regular
Joined: Aug 2009
Posts: 557 |
Has anybody installed an oil catch can for the PCV system or routed it to the atmosphere? Would love to see some pics, before I do mine...
2016 M3W, Army Green Matte/Tan Leather, 17k miles
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Joined: Jul 2014
Posts: 663 Likes: 14
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jul 2014
Posts: 663 Likes: 14 |
Just run it to atmosphere -- no need for a fancy catch can. Be sure to plug the hole in the inlet. I don't believe the three wheeler is GDI so it's not vital to do this. Obviously it is for a Plus 4 with the GDI engine because of inlet valve fouling.
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Joined: Feb 2018
Posts: 807 Likes: 38
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2018
Posts: 807 Likes: 38 |
Is there some particular problem you are trying to solve? I found more than expected grungy oil film in my intake manifold at about 8500 miles, but reasoned it was to be expected in a port injected engine. Now I just do a spritz of carb cleaner into each port before the warm up run on each oil change and that seems to help keep things clean.
Looking at S&S's breather routing diagram (In their engine manual) shows a closed loop system, which I'm going to say they went to some length to design and specify to deal with the very large crankcase pressure variations in a very big twin. Opening that system to atmosphere would, I believe, create larger positive crankcase pressure spikes with resultant oil seal issues.
Steve
Late 2012 M3W
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Joined: Jan 2020
Posts: 66
Just Getting Started
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Just Getting Started
Joined: Jan 2020
Posts: 66 |
one way breather valves work well and reduce crankcase pressure , some bmw bikes are fitted with them as standard , not sure which one , S&S have to comply with emisions for approval with you maybe able to alter now , Harley have exactly the same problem
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Joined: Aug 2009
Posts: 557
Talk Morgan Regular
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OP
Talk Morgan Regular
Joined: Aug 2009
Posts: 557 |
I have a lot of oil residue within my throttle body every time I clean my air filter. That would not be beneficial for carbon buildup/intake temperature.
The crankcase breather system is a simple hose that connects to the throttle body right before the butterfly valve, so pretty easy to re-route.
2016 M3W, Army Green Matte/Tan Leather, 17k miles
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Joined: Feb 2019
Posts: 1,889 Likes: 16
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Feb 2019
Posts: 1,889 Likes: 16 |
the older gold wings route the crankcase tube up to the carbs and are set up to drain the oil into a collector. That way the fumes go through the combustion cycle and the excess oil does not just drop on the roadway.
Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
Looks like another mod in my future.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: May 2014
Posts: 2,780 Likes: 5
Talk Morgan Expert
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Talk Morgan Expert
Joined: May 2014
Posts: 2,780 Likes: 5 |
One of my previous posts shows the set up on my plus 4. I'm not sure how to sh ow the link here and also not sure how useful that is to you. As Griffo says it's not crucial to vent via a can but I felt better doing this. It won't do any harm either way.
Steve
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
Is there some particular problem you are trying to solve? I found more than expected grungy oil film in my intake manifold at about 8500 miles, but reasoned it was to be expected in a port injected engine. Now I just do a spritz of carb cleaner into each port before the warm up run on each oil change and that seems to help keep things clean.
Looking at S&S's breather routing diagram (In their engine manual) shows a closed loop system, which I'm going to say they went to some length to design and specify to deal with the very large crankcase pressure variations in a very big twin. Opening that system to atmosphere would, I believe, create larger positive crankcase pressure spikes with resultant oil seal issues.
Does that spritz effect the o2 sensors negatively?
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: Aug 2012
Posts: 2,360 Likes: 2
Talk Morgan Expert
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Talk Morgan Expert
Joined: Aug 2012
Posts: 2,360 Likes: 2 |
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