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Old 02-13-2011, 12:48 PM   #91
Flood
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My oh my, don't you people have anything better to do on a Sunday than have multiple head explosions in a row?

There was already a call to order from a mod earlier. Please don't keep it up, gentlemen. It makes us feel like hall monitors and the other kids make fun of us.

Thanks.
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Old 02-13-2011, 12:49 PM   #92
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Back on track...Thanks Mods

So I wonder what the difference is between the old style and newer style breather is....and why one is better than the other, also the point of upgrading as some do.
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Old 02-13-2011, 01:01 PM   #93
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Quote:
Originally Posted by Flood View Post
My oh my, don't you people have anything better to do on a Sunday than have multiple head explosions in a row?

There was already a call to order from a mod earlier. Please don't keep it up, gentlemen. It makes us feel like hall monitors and the other kids make fun of us.

Thanks.
I'm learning, I'll contact the mods a lot sooner next time! Thanks!
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Old 02-13-2011, 01:44 PM   #94
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Originally Posted by The Raven View Post
I'm seeing the following things;

1. Less worn heads equate to less oil due to less blow-by resulting in less pressure forcing oil into the breather.

2. Oil into the carbs results in more carbon buildup in the cylinder

3. Less restriction in the airbox is a good thing.


Because of #1 I do not have much oil. My heads have new rings, new valves, and basically a new top end as of about 7k ago. So..I have very little blow-by.

Because of #3 it is a benefit to run the hose to the center stand or out the back. the drippers block 10% approx of the intake hoses.

#2 in time simply results in less displacement...
There is another benefit for minimizing oil entering the carburetors, power and detonation.

Although oil will burn it has a very low octane rating and can contribute to the detonation these motors are so prone to. This the reason why performance engine builders go to such lengths to reduce the introduction of oil through valve guides and past piston rings. Given this, it seems foolish to knowingly introduce oil into the intake system.
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Old 02-13-2011, 01:58 PM   #95
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Well, I missed whatever happened this time.



I asked ss if he was at the tech day in Pleasanton. I was there and so were a few other advriders. It would be interesting to put a face to a name.
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Old 02-13-2011, 02:12 PM   #96
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Back on track...Thanks Mods

So I wonder what the difference is between the old style and newer style breather is....and why one is better than the other, also the point of upgrading as some do.

The old style breather was a disc made of some composite material held with a spring.

The new style breather is a metal reed valve.

The primary problem with the old style is that it would sometimes eventually start squawking, kinda like a duck call or something.

I'm not sure if there's a noticeable difference in performance. The old style can be updated with the new style if it gets all ducky.
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Old 02-13-2011, 02:17 PM   #97
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Originally Posted by fishkens View Post
The old style breather was a disc made of some composite material held with a spring.

The new style breather is a metal reed valve.

The primary problem with the old style is that it would sometimes eventually start squawking, kinda like a duck call or something.

I'm not sure if there's a noticeable difference in performance. The old style can be updated with the new style if it gets all ducky.
Ducky on the Airhead, Tweety on the KLR I'm used to birds in my bikes
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Old 02-13-2011, 04:39 PM   #98
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there is another benefit for minimizing oil entering the carburetors, power and detonation.

Although oil will burn it has a very low octane rating and can contribute to the detonation these motors are so prone to. This the reason why performance engine builders go to such lengths to reduce the introduction of oil through valve guides and past piston rings. Given this, it seems foolish to knowingly introduce oil into the intake system.
exactly!
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Old 02-13-2011, 04:40 PM   #99
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Quote:
Originally Posted by fishkens View Post
The old style breather was a disc made of some composite material held with a spring.

The new style breather is a metal reed valve.

The primary problem with the old style is that it would sometimes eventually start squawking, kinda like a duck call or something.

I'm not sure if there's a noticeable difference in performance. The old style can be updated with the new style if it gets all ducky.
The old style will most definitely let more oil out!
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Old 02-13-2011, 04:57 PM   #100
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BMW replaced the disk with the reed valve in 1977? Something like that. I thought it was later because I really thought my '78 had the disk but Clymers says 1977. For what that's worth.
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Old 02-13-2011, 05:54 PM   #101
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I am thinking '79 but I don't know for sure.
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Old 02-13-2011, 05:58 PM   #102
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I am thinking '79 but I don't know for sure.
'79 or '80 was my first guess too so I'll chalk this up to Clymer's not getting it right.
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Old 02-13-2011, 06:43 PM   #103
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The reed valve breather was introduced in 1981.
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Old 02-13-2011, 07:14 PM   #104
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Good post except for the girls bickering!!! The left carb on my G/S drips oil on my boot, plus the carb bowl gets oily. I need to look into the Triumph method of engine breathing, now if the G/S had a chain I'd know where to run the line from the airbox!!!!! Might just have to route it behind the muffler as I don't think a catch bottle would look right.

BTW- fresh rings, valves, and guides. Airbox still get wet w/ oil.
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Old 02-13-2011, 09:21 PM   #105
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It sure seems like a baffled catch tank, with an oil return line would be just the ticket?!? I don't think much, if any vapor, no less oil could escape that!
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