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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #41  
Old 17th December 2019
DK Custom's Avatar
DK Custom DK Custom is offline
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Happened across this thread while doing some research on breather bolt hole size.

This video we made adds a little info to those that may be interested-






Kevin
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  #42  
Old 18th December 2019
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Quote:
Originally Posted by DK Custom View Post
Happened across this thread while doing some research on breather bolt hole size.

This video we made adds a little info to those that may be interested-

Kevin
It may be my browser but I can't link to your video.
I had to right click the post, 'view source' to get the url for it.
Is it possible for you to also include the url for us behind the ball peter users?
Here's the url:
https://www.youtube.com/watch?v=Kio4DEuOpCU

On another note.
I've been doing some testing on CC pressure also using a homemade slack tube.
It's pretty interesting and your balloon test supports my results in a way.
But results will vary depending on the condition of each umbrella as well as engine configuration.
Results also vary with engine temp.
The testing on mine started here in this thread although XLF member bustert had already done some slack tube testing on his S model previously in that thread.
http://xlforum.net/forums/showthread...99#post5784999

Other testing (including yours) is now in the XLF's Sportsterpedia starting here:
http://www.sportsterpedia.com/doku.p...essure_testing

My results so far:
A. Before changing to new umbrellas;
1. The rear umbrella was more stiff than the front one which was 'like new'.
2. I pulled the oil cap off at hot idle and the engine stumbled or died.
There was oil frothing in the oil tank when I pulled the cap off.
The frothing got less when the cap was 'slightly' off.
It didn't have any affect pulling the cap at cold idle.
3. There are app. 1/4" fluctuations in the pressure readings at 1000 and 2000 RPM.
The fluctuations are relative quick changing.

B. After changing to new umbrellas;
1. The engine loped a little better.
2. There was no noticable change in RPM with the oil cap removed.
3. There was no frothing of oil in the tank with the cap removed.
4. Engine sounds / lopes better with new umbrellas.
5. Residual vacuum was decreased with new umbrellas across the RPM range.
6. The engine flipped over to positive pressure at a lower RPM.
7. There was less gap between the pressure changes from 1000 and 2000 RPM.
8. Fluctuations of pressure at 1000-2000 RPM are much slower.

C. After restricting both breather bolts to 1/8" openings;
1. The smaller bolt holes actually reduced vacuum (increased positive pressure which would blow up your balloon some).
2. They also offer more control of CC pressure throughout the RPM range by creating lower pressure swings.

Other testing:
1. The air/fuel mixture did not have an affect on CC pressure.
2. There was no difference in pressure with the air cleaner on or off during testing.
3. Timing changes did not have an affect on CC pressure.

Other Notes:
There was no oil spewing / puking out the A/C before or after changing the umbrellas.
There was no extra drag on the motor before or after changing the umbrellas.

I'm not finished by any means but had to pause for life, a bad stator and swingarm bearings.

My first official test with the engine hot:
Left side of the tube is vacuum and the right side is positive pressure.
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In Search of Fuel, Sunshine and a Steady Idle.

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