Aftermarket crank breathers?? - Ducati.ms

08hyper · May 28th, 2008, 9:52 pm

Does anyone know the differance between the stock crank breather and the aftermarket ones, and what it does, other than for looks? T.I.A. Alex

08hyper · May 29th, 2008, 8:36 pm

NOBODY knows?? (I can't believe it....)

**oneducs** · May 29th, 2008, 8:37 pm

Quote:

Originally Posted by 08hyper

Does anyone know the differance between the stock crank breather and the aftermarket ones, and what it does, other than for looks? T.I.A. Alex

One looks better but they work the same.

dukepilot · May 29th, 2008, 8:58 pm

Yeah, they are basically bling items, work the same as the stocker with a reed valve inside.

If crankcase venting is an issue for you, you might want to try a Krank Vent, http://www.et-performance.com/kv.htm...ERS_&_CRUISERS

This valve creates negative pressure (vacuum) in the crankcase assuming that your engine has good ring and valve seal. There is some debate as to whether negative pressure is a benefit but the theory is that it eliminates parasitic power losses due to the positive pressure inside the crankcase caused by the pistons moving up and down. The valve does work in that it does create negative pressure. I can tell because when I unscrew the oil fill plug, I can hear the air rushing into the crankcase.

I run this valve in all my bikes including the HM. Since I eliminated the air box, I thought it would be a good idea to try it on the duc as well.

AXE · May 29th, 2008, 10:02 pm

Duke,

Tell us more about that vent. Can you post some pictures of your install on the Hyper?

I have a similar problem with the crankcase breather on my Rhino. I wonder if it would work on that application as well?

Thanks!

dukepilot · May 29th, 2008, 10:42 pm

Quote:

Originally Posted by AXE

Duke,

Tell us more about that vent. Can you post some pictures of your install on the Hyper?

I have a similar problem with the crankcase breather on my Rhino. I wonder if it would work on that application as well?

Thanks!

Yes, it will work on your Rhino. Check out the ET website link in the post above. Here is an image of my bike. The krank vent is attached to the red hose coming out of the stock breather, just below the K&N filter.

AXE · May 29th, 2008, 11:07 pm

So Duke, which one are you running? If I were to order the one for the 93 or newer big twins (part #EBTB) could use one on the Hyper and one on the Rhino.

So will this prevent oil from ending up in the airbox if you do not pull the breather tube and cap it with a K&N filter? Probably not I guess.

The problem with the Rhino is that I get oil blowing into the airbox when running at high revs. I fixed this by adding a small plastic bladder in the middle of the breather hose and capped the end with a small K&N filter like you used. It is still a mess to clean the bladder and it uses more oil. Will the ET breather eliminate the oil spurting out due to crankcase pressure at high revs?

Thanks!

dukepilot · May 29th, 2008, 11:19 pm

You need the metric kit for both the Rhino and HM. It should prevent oil from entering the airbox but I'm not offering any guarantee. All I can say is that I have never had that problem on my bikes with this valve. I had an MZ Sport Cup that had a 660 Yamaha single and it never blew oil, even at high revs. But then again, I'm not doing 12 O'Clock wheelies either. If you maintain correct oil level and everything else is OK, you shouldn't have a problem.

[

QUOTE=AXE;419772]So Duke, which one are you running? If I were to order the one for the 93 or newer big twins (part #EBTB) could use one on the Hyper and one on the Rhino.

So will this prevent oil from ending up in the airbox if you do not pull the breather tube and cap it with a K&N filter? Probably not I guess.

The problem with the Rhino is that I get oil blowing into the airbox when running at high revs. I fixed this by adding a small plastic bladder in the middle of the breather hose and capped the end with a small K&N filter like you used. It is still a mess to clean the bladder and it uses more oil. Will the ET breather eliminate the oil spurting out due to crankcase pressure at high revs?

Thanks![/QUOTE]

AXE · May 29th, 2008, 11:39 pm

I have heard that some of the 05 Rhinos had problems with oil consumption due to a slightly ovaled cylinder. This compounds the oil loss problem by burning a little and I think sucking air back into the crankcase and blowing it throught the breather. What do you think of that theory?

Anyway, I may give it a try. I am always up for experimenting.

Thanks!

dukepilot · May 30th, 2008, 12:55 am

Quote:

Originally Posted by AXE

I have heard that some of the 05 Rhinos had problems with oil consumption due to a slightly ovaled cylinder. This compounds the oil loss problem by burning a little and I think sucking air back into the crankcase and blowing it throught the breather. What do you think of that theory?

Anyway, I may give it a try. I am always up for experimenting.

Thanks!

If the cylinder is defective, the krank valve may not work very well because it needs a tight engine to create the negative crankcase pressure. An ovaled cylinder will cause excessive blow by. In this case the krank valve would most likely be an ineffective bandaid.