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Author Topic: 2019 cvo sumping  (Read 9794 times)

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fastfreddy

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Re: 2019 cvo sumping
« Reply #120 on: February 10, 2019, 10:55:51 AM »

 if a sump is designed properly it should be flooded at its pickup...  :nixweiss:  and if sump area is under vacuum/pressure that the pump cant over come,   :nixweiss:  is this the cause  :nixweiss:   so if you vent crank case to atmosphere would this end the issue, sorry but im not the sharpest pencil in the pack just asking  :nixweiss: :nixweiss: :nixweiss:
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Tobias7000

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Re: 2019 cvo sumping
« Reply #121 on: February 10, 2019, 02:06:50 PM »

if a sump is designed properly it should be flooded at its pickup...  :nixweiss:  and if sump area is under vacuum/pressure that the pump cant over come,   :nixweiss:  is this the cause  :nixweiss:   so if you vent crank case to atmosphere would this end the issue, sorry but im not the sharpest pencil in the pack just asking  :nixweiss: :nixweiss: :nixweiss:
I’ve heard running with the dipstick lose improves venting and significantly reduces chances to sump.  Four articles in a series in American Iron magazine explored this. I’ll have to look up which months these were published if anyone’s interested.  Anyone tried this?


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grc

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Re: 2019 cvo sumping
« Reply #122 on: February 10, 2019, 04:59:44 PM »

I’ve heard running with the dipstick lose improves venting and significantly reduces chances to sump.  Four articles in a series in American Iron magazine explored this. I’ll have to look up which months these were published if anyone’s interested.  Anyone tried this?


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The only thing that will do is vent the oil pan, not the crankcase.  The crankcase is already vented through the standard breather system.  At this point in time I've seen nothing that indicates the problem is caused by a pressure build-up in the crankcase or the oil pan.  A pressure build-up in the crankcase wouldn't cause sumping, it would actually help make the oil flow to the scavenge side of the pump.  The thing that did change for the M8 is the design of the engine cases and the location of the oil pickup hole in the sump, and that is where I believe the problem was created.

JMHO - Jerry
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cmashark

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Re: 2019 cvo sumping
« Reply #123 on: February 12, 2019, 01:53:59 AM »

The only thing that will do is vent the oil pan, not the crankcase.  The crankcase is already vented through the standard breather system.  At this point in time I've seen nothing that indicates the problem is caused by a pressure build-up in the crankcase or the oil pan.  A pressure build-up in the crankcase wouldn't cause sumping, it would actually help make the oil flow to the scavenge side of the pump.  The thing that did change for the M8 is the design of the engine cases and the location of the oil pickup hole in the sump, and that is where I believe the problem was created.

JMHO - Jerry

Jerry,
There is a vent between the crankcase and the oil tank. If my memory serves me well, its  a lot larger than the 2 going to the air cleaner.  If I had a sumper, I would be willing to try it.  Star Racing seems to believe the sumping issue stems from ring seal. Seems like the guys offering these 124 an128 kits aren’t seeing the sumping on their builds.... or at least the owners are being extremely quiet.

Chris
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Tobias7000

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Re: 2019 cvo sumping
« Reply #124 on: February 13, 2019, 11:39:12 PM »

A quick teaser on the articles I mentioned previously.  See the attached image.
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Heatwave

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Re: 2019 cvo sumping
« Reply #125 on: February 14, 2019, 06:44:04 AM »

Is there a link to the full article?
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Tobias7000

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Re: 2019 cvo sumping
« Reply #126 on: February 15, 2019, 05:11:41 AM »

Is there a link to the full article?

No link I know of.  I have a paid electronic subscription through my iPad.  It’s not that expensive and you can purchase back issues.  You want issues 365 through 368 to get the full analysis of this Sumping situation.  A very well written set of articles IMHO.

https://www.aimag.com/wordpress/wp-content/uploads/subscription/AIM.html

Once you subscribe you download the ZINIO app and you can get your digital issues delivered that way. 

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