A Dissertation On Ventilation - Page 2 - Kawasaki KLR 650 Forum
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post #11 of 77 Old 10-10-2013, 01:47 PM
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Hi TwinJet,
We would ALL like to see that!
Question is, WHO can find IT, and POST it?
pdwestman
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post #12 of 77 Old 10-10-2013, 02:02 PM
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Hi TwinJet,
We would ALL like to see that!
Question is, WHO can find IT, and POST it?
pdwestman
My apologies to Mr. Bunn who is actually from New Zealand not England.

PDF link to his article on the "Bunn Breather":

http://www.britcycle.com/products/bu...er_Article.pdf

His blog (will be discontinued on 10/13/2013):

BritishCycles at: http://www.britcycle.com/products/bu...eather_kit.htm
http://bunnbreather.bigblog.com.au/index.do

Last edited by twinjet; 10-10-2013 at 03:05 PM. Reason: clarity and added link to supplier
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post #13 of 77 Old 10-10-2013, 06:13 PM
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Thanks twinjet,
Good read.
Has anyone contacted Mr. Bunn, as to whether or not He might have something for the KLR650?
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post #14 of 77 Old 10-11-2013, 09:25 AM
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Thanks twinjet,
Good read.
Has anyone contacted Mr. Bunn, as to whether or not He might have something for the KLR650?
pdwestman
He hasn't got anything specifically for the KLR650 other than a "universal" kit of parts.

His idea is, like your suggestion in an earlier post, is adding a vent in the cam case. The trick is using his one way flow valves to make the two vents pass air from one to the other. His test is to blow into one vent and listen for the air flowing out the other (while the engine is off).

I've been reluctant to drill a hole in my engine because I don't understand how the stock breather connects to the crankcase volume under the piston. The pictures in my Clymer manual are no help and there's no written explanation. My fear is that the Kawasaki engineers are using the crankcase pressure pulses to help scavenge oil from the case to the oil pump pickup. If that is true, adding another vent may cause oiling problems.
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post #15 of 77 Old 10-27-2013, 07:41 AM
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Ok guy's,
Think MOISTURE EVACUATION?
How many times has this site and others had to EXPLAIN, "milky oil windows"?

I've driven my pick-up mostly, 1.1miles, morning and evening, mostly 6 days a week, for 18 years, NEVER had milky oil! Even in the -20 to -40F. winters.
I could not (CAN NOT) do THAT, with the KLR, in +45 to +70F. spring-fall weather!
pdwestman
For 1 thing your truck has a PCV system, the KLR does not and the discussed mod does not change that. It adds a PCV valve but still it is not a PCV system.
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post #16 of 77 Old 10-27-2013, 04:34 PM
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i cant for the life of me figure out why it would be needed. after all these bikes have been made the same for almost 30 yrs. one would think they got it right. dont fix what aint broke is how i see it. honestly how much benefit would doing this mod would you get?

Never ride faster than your angels can fly
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post #17 of 77 Old 10-27-2013, 05:28 PM
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i cant for the life of me figure out why it would be needed. after all these bikes have been made the same for almost 30 yrs. one would think they got it right. dont fix what aint broke is how i see it. honestly how much benefit would doing this mod would you get?
Cleaner oil?
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post #18 of 77 Old 10-30-2013, 10:13 AM
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Originally Posted by DaveO430 View Post
For 1 thing your truck has a PCV system, the KLR does not and the discussed mod does not change that. It adds a PCV valve but still it is not a PCV system.
DaveO430,
I think your overlooking the point, the 1st posting, my earlier suggestion and the "Bunn Breather" are all Flow-Thru designs.
Positive Crankcase Ventilation!

The question remains, with existing cam cover is there enough internal space to make and install a functional Air/Oil separator?
And How quickly/slowly does the KLR engine warm the oil? You might look at my "camshaft oil pressure" thread for temps.
pdwestman

Last edited by pdwestman; 10-30-2013 at 10:23 AM. Reason: /slowly
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post #19 of 77 Old 11-01-2013, 06:32 AM
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I'm reluctant to dyno test - my KLR shreds it's back tyre in what, 2 yrs now, without punishing it on a dyno...
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post #20 of 77 Old 11-01-2013, 07:20 AM
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DaveO430,
The question remains, with existing cam cover is there enough internal space to make and install a functional Air/Oil separator?
pdwestman
Bruce Meyer, a Ducati tuner, had a race modded Ducati 996 with an air oil separator under the seat. Adventure bikes like the KLF could put the separator in a top case!
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