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April 23rd, 2009, 07:41 PM   #51
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Can anyone recommend any more part numbers for cheap check valves that work well for the Crankcase Vent mod?
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April 23rd, 2009, 10:48 PM   #52
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April 24th, 2009, 02:04 AM   #53
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Thanks Smorgasbord, that one is cheap! The only problem is, it wouldn't allow me to connect a hose to the other side, as I'd like to connect the other end of the valve back to the frame.

I use the bike for supermoto and street, so I don't want oil vapor blowing around at all, as it may end up on the rear tire.

I'm looking for a vehicle year, make and model of car or truck (in North America) that has a check valve that works well on the berg, so I can go and pick one up at the parts store after work today.

Thanks
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June 2nd, 2009, 12:58 PM   #54
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Air Injection Check Valve (Jaguar # C34017) All XJS with V12
(Note: This is a GM part. It is used, for example on a 350 cu inch Chevrolet V8.
A1 Cardone A42-103
AC Delco 2332530
Automotive Electronics 17001
Big A 46-1005
Borg Warner CV8
Filko 45-105
GP Sorenson / Guaranteed Parts 779-2929
Kem 174-176
Motormite 55050
NAPA 2-2900
Niehoff FE-476
Sound Solution 15903
Standard / Carquest AV7
Tomco Ellis 17001
Walker 15903
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June 2nd, 2009, 03:01 PM   #55
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Note: This is a GM part. It is used, for example on a 350 cu inch Chevrolet V8.
get it while you can
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June 3rd, 2009, 12:56 PM   #56
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negative pressure in crankcase - not so good

a similar mod when done in a gsxr 1k may cause it to blow an oil seal.. The seals weren't designed to withstand that kind of abuse....

You may search for 'vacuum mod' in google etc.... Just remember that excess negative pressure in the crankcase might have (tiny if any) benefits performance wise but may cause your oil seals to fail etc....

I don't know if that's the case with bergs as well, but i thought it would be a good idea to tell you what i know....
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June 10th, 2009, 06:07 AM   #57
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well after going to all the auto part retailers and garages in my area and being met with confused looks i ordered a high speed check valve from the states, not the kem one recommended by dale but the same from another manufacturer.

$30 all in plus it arrived in 3 days. which is something considering post isnt usually that fast within the uk!



have been running an open breather pipe for a little while but have gotten a little paranoid about it sucking up water which is rather odd as i've never had a bike suck water up the header breater, plus the oil vapour reacting with the water and making the lower frame rails and ignition cover oily white was annoying me.

the rearward vent and the airnox vent are capped with 19mm walking stick tip rubbers. fitted perfectly.

there is also about 6 mm clearance between the valve and the rad despite it not looking that way.

anyway been for a spin and all seems well. bike seems smoother and stronger but think that's just my imagination.
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June 10th, 2009, 11:15 AM   #58
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Im going to be using my bike for Street Use Only, why would this be need to do a crank vent mod?
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June 10th, 2009, 04:00 PM   #59
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Originally Posted by HeyJohnnyPark
Im going to be using my bike for Street Use Only, why would this be need to do a crank vent mod?
no need at all.

no need for me to do it other than i could and wanted to try it plus i've had the carb fill with oil a couple of times following crashes and its a pain in the ass.

doing this is an easier way of preventing that than not crashing.
Thanks from jonwilli
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June 10th, 2009, 04:15 PM   #60
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Originally Posted by HeyJohnnyPark
Im going to be using my bike for Street Use Only, why would this be need to do a crank vent mod?
Other than a potentially slight H.P. increase the chances of flipping the bike over on the street and having the crankcase fill the cylinder with oil are quite slim. Off road the chances tend to increase and a breather mod is not a bad idea.
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