Schebler / Linkert carb info

[Steve Swan]

Thanks for posting your thoughts and printed information,Tom. An old timer who was a friend, mentor, service manager for Rich Budelier and a Harley dealer spoke to the significance of the holes connected by a slot for idling in relationship to the changing position of the throttle disc, but unfortunately i did not think to ask him how they work or what they actually do.

Your comments about the holes certainly are logical, especially, if i remember correctly the larger hole is innermost supporting that "transition" you speak of. In my mind, it would make sense that the larger hole would allow an increase of atmospheric air flow as the moving throttle disc allows increased opening to the venturi as engine rpm's increase.

It would seem logical that as the throttle disc allows a larger opening into the venturi leading to the manifold that these holes "communicate" with the atmospheric air as the reduced pressure from the throttle opening affects emulsification (dispersion) of gasoline droplets and air in relationship to the increasing demands of the engine in relationship to the quantity and rate of speed the engine receives the air/fuel mixture.

As you mentioned in your comments about "transition," i can only imagine that these 2 holes connected by a slot allow for an "eveness" of the flow of the air/fuel mixture under the changing forces of the throttle disc opening more thereby allowing more air to enter in concert with increasing engine rpm.

[T. Cotten]

I'm not going to pretend that I understand these things, Steve!

DLXs just have the two holes; The slot, and a high-speed needle guide, were just about the only improvements L&L came up with until the DC era.

The mixing chamber or 'well' gives few clues. Note many Indian Linkerts had a 'tit' or 'bubble-buster' on the plug, that came quite close to the bleeds:
BLEDPLUM.jpg
This appeared appeared possibly as early as '41, certainly by '44, but was not used by HD.

The bleeds and slots vary by model greatly; Here are two M51s that give a sparse clue how the slot was cut:
51SLOTS.jpg

Here we have two Bonnes,
BON352.jpg

And for comparison, M7B,..
74Bbleed.jpg


The more I observe, the less I know.

....Cotten
PS: Before I forget, the throttledisc fully closes directly in the middle of the bleeds:

DISKBLED.jpg
But it never operates that way. Even at idle, it is open enough for the disc's bevel to direct the pulse of air into the front bleed, to mix with fuel hopefully already mixed with air metered by the clearance between the lowspeed needle and it's spring collar.

Everybody at the bar said Linkerts were simple.

[Steve Swan]

Tom, i know far less than you. Thank you for the pictures and your thoughts. It's fun to think about this stuff. Maybe if we held a seance' we could conjure up Maldwyn Jones who was a Schebler man, but i'm sure he knew Linkerts as well.

[T. Cotten]

At least we have the interwebs to research this stuff, Steve!

With credit to "Nifty",...

It appears that to be a carburetor expert in the early days, you needed not only extraordinary math skills, you also needed to study internal medicine:
W-S Jul 20 1929 Indy Times.jpg

A dry sense of humor is a lost art.

....Cotten