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-   -   Sportster Crankcase Pressure / Engine Breathing / Wetsumping and Mods (http://xlforum.net/forums/showthread.php?t=2073932)

rocketmangb 9th August 2019 03:13

Yep
Engine side !

Hippysmack 9th August 2019 03:17

OK.
So now I'm confused.
What year went down to 1/16" on the engine side?

Quote:

Originally Posted by Folkie (Post 5756331)
Not sure exactly how big the hole in the back of the bolt is: 1.5mm? 1/16"? The hole in the front is 5/16".

It's zinc passivated steel. Not sure what sort of steel. It may actually be zinc passivated cream cheese!


dieselvette 9th August 2019 03:23

"But if you did and with the pump connected, remember the cam chest port in the front of the pump drops down into the same gears from the sump."

That's a great point - actually it could run through there pretty quickly. It amounts to probably the equivalent of a 3/16" hole between those teeth. It wouldn't surprise me if a half a quart could get through there in 10 minutes. Not that there was that much in the cam chest, but whatever was would have certainly made its way to the sump.

So now it's starting to make a little more sense.

Im still going to keep on the list of things to check during assy - the oil tank vent test and pump test i just mentioned. Because I had wetsumping before the rebuild, and if I have it again I want to at least rule those things out.

dieselvette 9th August 2019 03:24

Hippy he said 0.025, not 0.25

dieselvette 9th August 2019 03:26

I will legit measure mine on Saturday, but for now im gonna say about 1/16
2004

Hippysmack 9th August 2019 03:29

Quote:

Originally Posted by dieselvette (Post 5768682)
Hippy he said 0.025, not 0.25

:doh:yikes:smackh

Quote:

Originally Posted by dieselvette (Post 5768680)
"But if you did and with the pump connected, remember the cam chest port in the front of the pump drops down into the same gears from the sump."

That's a great point - actually it could run through there pretty quickly. It amounts to probably the equivalent of a 3/16" hole between those teeth. It wouldn't surprise me if a half a quart could get through there in 10 minutes. Not that there was that much in the cam chest, but whatever was would have certainly made its way to the sump.

So now it's starting to make a little more sense.

Im still going to keep on the list of things to check during assy - the oil tank vent test and pump test i just mentioned. Because I had wetsumping before the rebuild, and if I have it again I want to at least rule those things out.

Keep us posted on how that goes. :)

rocketmangb 9th August 2019 03:31

OK
The Hex side is the air cleaner side
The long side is cylinder head and the hole is indeed .062 !

Hippysmack 9th August 2019 03:32

Quote:

Originally Posted by rocketmangb (Post 5768671)
WOW !
I looked at a stock breather bolt and the hole appears to be about .025 !

Ttthhhat's tiny.
Less than 1/32?
You been into busterts crown?

rocketmangb 9th August 2019 03:37

Tis .062 not .025 !

Hippysmack 9th August 2019 03:41

I think you knew ahead of time what that was going to do to me.....:laugh
Is this correct?
Quote:

Originally Posted by Hippysmack (Post 5768674)
That must be this side?
A/C side:
Per Folkie, this one is 5/16"
http://sportsterpedia.com/lib/exe/fe..._by_folkie.jpg

Engine side:
We've got this side at 1/16"
http://sportsterpedia.com/lib/exe/fe..._by_folkie.jpg



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