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Old 1st July 2019
Hippysmack's Avatar
Hippysmack Hippysmack is offline
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Default Sportster Crankcase Pressure / Engine Breathing / Wetsumping and Mods

I have created a page in REF section of the Sportsterpedia for Evo Crankcase Pressure.
That will eventually spin off an IH Crankcase Pressure article.

There are many threads on crankcase pressure and related topics spread all over the forum.
The Sportsterpedia article is a compilation of this forum (plus what I've learned along the way).
And in so being, each format gives to the other.
Information from the forum went into creating the pedia article.
Likewise, I'm bring that article into this thread for further exposure and discussion.
Hopefully it'll be helpful to all of us.

I'm no expert, but I am trying to learn as much as I can about Sportster engine breathing.
Key phrase "Sportster Engine Breathing".
Different year models have their differences.
But engine breathing / crankcase pressure / Wetsumping and the like are conditions we all have in common, with exceptions of course.
So this thread is dedicated to ALL Sportster engines.
Input from the IH and Evo community from 57 to present would be greatly appreciated.
Novice to experts welcomed.
This is not meant as a tutoral but more of a discussion.
I've probably got more to learn than most actually.
But let's see where we can go with it.

Dr Dick once called this subject one of the "Dark Arts" of Sportsterdom.
I understand why completely.
There are forces inside a running engine that are real difficult to understand.
As bustert once alluded to, what you can prove on paper still doesn't match what is going on inside.
So this article is created based on facts as well as theory.
As well as some science (most of which is over my head).

Related articles in the Sportsterpedia:
(all of these pages can be accessed by the main Tech Menu:
http://sportsterpedia.com/doku.php/techtalk:menu

IH Crankcase Ventilation:
http://sportsterpedia.com/doku.php/t...k:ih:engmech07
IH Engine Oiling:
http://sportsterpedia.com/doku.php/techtalk:ihil01
IH Oil Pump Main Page:
http://sportsterpedia.com/doku.php/techtalk:ihil03
Evo Crankcase Ventilation:
http://sportsterpedia.com/doku.php/t...:evo:engmech07
Evo Engine Oiling:
http://sportsterpedia.com/doku.php/techtalk:evoil01
Evo Oil Pump Main Page:
http://sportsterpedia.com/doku.php/techtalk:evoil03
Evo Crankcase Pressure:
http://sportsterpedia.com/doku.php/t...:ref:engmech04
Wet Sumping:
http://sportsterpedia.com/doku.php/techtalk:refil10
Engine and Primary Oil System Modifications:
http://sportsterpedia.com/doku.php/techtalk:refil05
Cylinder Compression Test:
http://sportsterpedia.com/doku.php/t...:ref:svcproc20
Cylinder Leak-Down Test:
http://sportsterpedia.com/doku.php/t...:ref:svcproc21

Breathers and Testing Videos:

DK Custom Breather System Air Volume Testing of Harley-Davidsons
Is your Harley making a mess? MFAQ about Oil & your Motorcycle (from DK Custom)
FAQ's External Breather Systems for Harley by DK Custom
__________________
Diagnosis begins before teardown, during and after rebuild.

In Search of Fuel, Sunshine and a Steady Idle.

Reference the XLFORUM'S Sportsterpedia
for additional technical information & advice

Last edited by Hippysmack; 25th July 2019 at 18:07..
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