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There are many options for aftermarket oil recovery/breather venting system
. Krank vent makes a check valve type of unit also,that controls oil misting. The old man probably kept his oil level right to the full mark which is a no no ..imho... Plug checking would reveal any potential carbon building. Like Texas said,It doesn't take a big hole to vent her out.. you'll find something..
I have been checking around today and found a few. I was more concerned with letting it breath thru one small hose for a lot of crank pressure. The bigger the engine and higher revs make for big crank pressures. Ill get it sorted. Crank pressure always seems to be given very little thought when 2, 4" pistons are spinning at 5k rev per min and you use a 1/4 hole to vent it.
Yea, well Tex has a library of books on the subject, just ask him.
I have been checking around today and found a few. I was more concerned with letting it breath thru one small hose for a lot of crank pressure. The bigger the engine and higher revs make for big crank pressures. Ill get it sorted. Crank pressure always seems to be given very little thought when 2, 4" pistons are spinning at 5k rev per min and you use a 1/4 hole to vent it.
Yea, well Tex has a library of books on the subject, just ask him.
The S&S engines I've seen have both head and case breathing systems.
Whether yours does or not don't you think the engineers at S&S would have thought about that problem and made sure it was taken care of???
Too bad they changed the breather system to the stock Harley setup, they did that to make the long blocks more of a direct replacement.
My complete engine came with a different setup. It has a small hose from the front rocker box to the manifold, and a 3/8" hose with a check valve inline from the rear head rocker box to the a/ c, which I rerouted to the ground.
There are flapper valves in the rocker boxes, which are part of the gasket.
There's no breather bolts, just std bolts holding the a/c.
My oil tank is under vacuum, if i remove the oil cap, I have a vacuum leak.
Some claim oil can be drawn into the intake through the small hose, I never had that problem, and the large hose never leaks anything, oil, water, mist, nothing. Had a rear head gasket leak a while back, no excessive carbon buildup when I replaced them.
I wouldn't hesitate to call S&S tech and see what they recommend if your having a breather issue.
Too bad they changed the breather system to the stock Harley setup, they did that to make the long blocks more of a direct replacement.
My complete engine came with a different setup. It has a small hose from the front rocker box to the manifold, and a 3/8" hose with a check valve inline from the rear head rocker box to the a/ c, which I rerouted to the ground.
There are flapper valves in the rocker boxes, which are part of the gasket.
There's no breather bolts, just std bolts holding the a/c.
My oil tank is under vacuum, if i remove the oil cap, I have a vacuum leak.
Some claim oil can be drawn into the intake through the small hose, I never had that problem, and the large hose never leaks anything, oil, water, mist, nothing. Had a rear head gasket leak a while back, no excessive carbon buildup when I replaced them.
I wouldn't hesitate to call S&S tech and see what they recommend if your having a breather issue.
Im trying to stay away from crank case breather issues is the reason for this thread. Thanks Schex you always have good input.
At one time S&S recommended running both the upper head breathers and the bottom breather simultaneously once past 96". I do on my 113" and do not on my 96"
At one time S&S recommended running both the upper head breathers and the bottom breather simultaneously once past 96". I do on my 113" and do not on my 96"
No issues that way.
Griz
I don't know where my bottom breather is on my new S&S 111, if there is one on the engine.
Can you post a picture of the bottom breather< thanks
I'm having a problem identifying the problem here! Aces, you should be out running that thing in and putting miles on it - you only have time to sleep, not think. Took several thousand miles for my 107 to give its best, so let us know when you get there!
Yours may or may not look like this depending on year of production.
From S&S site:
S&S cases for 1984-'99 big twin engines, give the engine builder the option of venting the crankcase breather from a fitting on the crankcase, through the cylinder heads, or both. We recommend using both crankcase breathers in engines of 96” or larger displacement. To make this possible in all applications, there are two crankcase breather holes available in the rear of alternator crankcases for 1984-’99 models. One is in the stock location, and the other is angled down to allow the installation of a crankcase breather fitting in chassis with integral transmission/oil tank.
My 96 is too close to the tranny on the dresser to run both, but the 113" works perfectly with both on it. Go figure.
I'm having a problem identifying the problem here! Aces, you should be out running that thing in and putting miles on it - you only have time to sleep, not think. Took several thousand miles for my 107 to give its best, so let us know when you get there!
Its been raining here a lot and I do still work so I ride ever chance I get.
The problem has been stated where S&S says anything over 96" needs to be vented from heads and crank case. I am not finding my crankcase vent yet, if it exist.
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