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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 4th November 2017
Edgeydt50 Edgeydt50 is offline
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Default Crankcase breather and heavy breather

So I took off a hypercharger off my 06
Replaced it with a heavy breather but can't fit the crankcase breather. The bolts just breath into the carb. Is this OK? What is the best route?
Thanks in advance
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Old 4th November 2017
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Quote:
Originally Posted by Edgeydt50 View Post
So I took off a hypercharger off my 06
Replaced it with a heavy breather but can't fit the crankcase breather. The bolts just breath into the carb. Is this OK? What is the best route?
Thanks in advance
The Heavy Breather is designed to route the crankcase venting into the intake - just like the stock/OEM setup does. If you do some search/reading you'll find that opinions vary on the subject of routing the venting to the intake. I don't think anybody argues that it's not ideal. The argument is - does it do any real harm? If you go over to DK's website - that I mention below - you'll find pictures of the carbon buildup on top of the pistons caused by venting to the intake.

In my opinion, you don't want a hot mist of both oil and water making it's way into the intake. It's better to vent to atmosphere - for various reasons.

I believe I've seen a thread on here or over at HDforums.com where they were talking about modifying a Heavy Breather to vent to atmosphere. You may be able to find it via search.

On the other hand, DK and K&N have similar breathers that are already setup for this - or can easily be setup for this. For the DK breather, head over to http://www.dkcustomproducts.com/ and look for the Outlaw HiFlow 636V. They'll also have what you need there for the external breather venting.

Here is a picture of it on my bike...



I've also added a Kranvent inline to deal with potential failing umbrella valves.

The K&N intake you would be looking for is the K&N 63-1126 I believe. It has a port on the side of the intake tube that connects to a horse shoe breather via a small rubber hose. The point of that is so they can vent to the intake just like a stock/OEM setup. You could skip that, cap off the port and use an external breather setup like you can get at DK.
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Old 4th November 2017
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Default

Hi,

Thanks for this, very helpful.
I found the guide on HD forums and i think i'll have a go at drilling the bracket and fitting some the breather hoses. Thanks again
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Old 4th November 2017
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You are probably talking about head breathers. As far as I know the crankcase breather is routed to the oil tank. At least on my 86er is so..?
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Old 5th November 2017
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Quote:
Originally Posted by juzyHD View Post
You are probably talking about head breathers. As far as I know the crankcase breather is routed to the oil tank. At least on my 86er is so..?
No... That makes sure the oil tank is at the same pressure...

The overall system/crankcase venting is via the breather bolts in the head. The crankcase vents up the push rod tubes into the head and out the breather bolts.
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Old 5th November 2017
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Sorry. My bad. Totally different sistem than older bikes.
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Old 5th November 2017
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there is an equalizing line between bag and c/c so they run the same pressure, if not, under certain conditions, could impede oil flow.
yep, he says the hd system is an engine killer, see no stats on it though. truth told, that build up can come from a variety of places. by the time the c/c vent is supplying that much oil, there are MORE serious issues that need addressing and band-aiding by dropping to atmosphere while an option, big brother does not like it. forest gump said it all: "stupid is what stupid does" as the majority of riders over-look stuff till it becomes an issue, try getting an inspection in cali with oil dripping on the ground.
if you are getting that much, before it gets to that point, there will be intake track varnish way before.
seen industrial engines running decades 24/7 belting out 1000's+ hp and yep when they get old, they will coat the intake track but still trudge on.
carbon on the top of a piston although concerning to some, is not a big issue, but when you see cyl walls with varnish, then you have serious issues.

http://media.noria.com/sites/archive...stat-fig10.jpg
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Old 17th November 2017
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My homemade EBS (external breathing system) for a stock HD A/C.

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Old 17th November 2017
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Quote:
Originally Posted by glbsportster View Post
My homemade EBS (external breathing system) for a stock HD A/C.

So I take it that you don't use an element, just open to the air?
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Old 17th November 2017
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I am assuming element means a catch can or filter...I have a filter under the engine, after over 3 hours of riding....no oil in the filter, yet. I check it after every ride. Yes, the filter is open to the air.

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