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Old 05-23-2012, 08:00 PM   #1 (permalink)
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Still blowing oil out the breathers

Hopped on the bike and headed 3.5 hrs down to Kentucky. Noticed the rear brakes fading. Sure enough, got down there and I blew about 1/4 of a quart all over the right rear of the bike.

Got home from my trip and drained 4 or 5 ounces from the crank case. I checked the rubber breather valves and they are functioning properly (let air out, not in).

What's next? Leak down check?
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Old 05-23-2012, 09:02 PM   #2 (permalink)
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What kind of air cleaner do you have?
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Old 05-23-2012, 09:11 PM   #3 (permalink)
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Are you running the upgraded stamped steel breathers?
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Old 05-23-2012, 10:07 PM   #4 (permalink)
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What breather/backing plate you running?
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Old 05-24-2012, 06:16 AM   #5 (permalink)
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Quote:
Originally Posted by drivr01 View Post
What kind of air cleaner do you have?
It's a K&N element on a back plate from GMR
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Originally Posted by BVBOB View Post
Are you running the upgraded stamped steel breathers?
Bob, are you talking about the breather assemblies that mount to the rocker shaft holders/bases? If so, they are the stock 2007 model, which I think were cast aluminum.

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What breather/backing plate you running?
Backing plate from GMR. I have banjo fittings and run 2 separate hoses to the ground.
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Old 05-24-2012, 06:18 AM   #6 (permalink)
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Yep, the top breathers, swap out to the new style and you might be pleasantly surprised.
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103
Donatell heads
553 bd cams
Power duals with re-core cvo
Welded crank



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Old 05-24-2012, 07:08 AM   #7 (permalink)
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Quote:
Originally Posted by BVBOB View Post
Yep, the top breathers, swap out to the new style and you might be pleasantly surprised.
Found this thread:

http://www.v-twinforum.com/forums/tw...-assembly.html

I'll give em a shot.. Thanks Bob!
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Old 05-24-2012, 07:11 AM   #8 (permalink)
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Bob, what made you go with the Thayer pump? Were you having scavenging problems, or did you do it for the hell of it?
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Old 05-28-2012, 11:11 AM   #9 (permalink)
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Well I put in the new style breathers. Still blowing oil, maybe more now. One thing is that it seems it's only coming out of the rear head. Only thing I think is that the oil return in the rear head is blocked. Anyone ever encounter this?
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Hobanized Crank, Axtell 117" cylinders, CP flat tops, 10.6:1 CR, Woods TW8, R&R cast heads, R&R roller rockers, HPI 51mm T/B, 4.9 g/s SE injectors, D&D Fat Cat 2into1 QB, Rivera Pro Clutch, Evo Industries 49T, Tuned by Big Boyz
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Old 05-28-2012, 11:40 AM   #10 (permalink)
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Solution?

R&R heads, 124 inches, logged over 70,000 miles.
Breathers ran mandatory catch can at sanctioned drag strips, on the road breathers only.... the breathers would mist (ever-so-slightly).
The last 5,000 miles we ran a turbo, no oil issues....ever...
www.et-performance.com

Ray
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Old 05-28-2012, 02:01 PM   #11 (permalink)
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Quote:
Originally Posted by raycwheeler View Post
R&R heads, 124 inches, logged over 70,000 miles.
Breathers ran mandatory catch can at sanctioned drag strips, on the road breathers only.... the breathers would mist (ever-so-slightly).
The last 5,000 miles we ran a turbo, no oil issues....ever...
www.et-performance.com

Ray
Ray,
What are you suggesting I do?
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2007 Street Glide
Hobanized Crank, Axtell 117" cylinders, CP flat tops, 10.6:1 CR, Woods TW8, R&R cast heads, R&R roller rockers, HPI 51mm T/B, 4.9 g/s SE injectors, D&D Fat Cat 2into1 QB, Rivera Pro Clutch, Evo Industries 49T, Tuned by Big Boyz
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Old 05-28-2012, 02:32 PM   #12 (permalink)
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vents

Contact et performance and give it a try.
They work...


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Ray,
What are you suggesting I do?
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Old 05-28-2012, 06:05 PM   #13 (permalink)
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I think you may want to go ahead and do that leak down test now.
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Old 05-29-2012, 04:40 AM   #14 (permalink)
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Quote:
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I think you may want to go ahead and do that leak down test now.

You may be building up crankcase pressure due to cylinder leakage.
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Old 05-29-2012, 06:14 AM   #15 (permalink)
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I wouldn't mind doing that leak down test. Anybody know where I can get a tester?
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Hobanized Crank, Axtell 117" cylinders, CP flat tops, 10.6:1 CR, Woods TW8, R&R cast heads, R&R roller rockers, HPI 51mm T/B, 4.9 g/s SE injectors, D&D Fat Cat 2into1 QB, Rivera Pro Clutch, Evo Industries 49T, Tuned by Big Boyz
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