[BlackStick]

Not in the boosters & venturii, no. That said, turbulence is a deeeep rabbit hole 😉

When I reload black powder cartridges like 50-70 and 50-100, I drop the powder into the cases through a 32-inch long tube. The tube has 5 or 6 sheet metal screws that go through it creating "baffles". The baffles cause the powder to "flutter" in and settle more compactly. The settling greatly improves burn consistency...

Probably apples and oranges...

 

[Huskinhano]

Color me stupid: wouldn't rough areas increase turbulence and improve mixture?

Sometimes yes sometimes no. In this case no because it has to meter and evenly disperse the fuel going into the airstream.

 

[ArizonaGT]

When I reload black powder cartridges like 50-70 and 50-100, I drop the powder into the cases through a 32-inch long tube. The tube has 5 or 6 sheet metal screws that go through it creating "baffles". The baffles cause the powder to "flutter" in and settle more compactly. The settling greatly improves burn consistency...

Probably apples and oranges...

Interesting. I know some black powder guys, I’ll ask if they do the same/similar. Mostly 45-70, a few guys shooting 45-90

 

[BlackStick]

There are a bunch of BPCR (Black Powder Cartridge Rifle) shooters between Prescott and Tucson. Most shoot 45-70 or the die-hard competitors, the 45-90. Advantage to the 45-70 is the ability to buy ammo off the shelf and reselling a 45-70 is infinitely easier than a 45-90.

Most shooters load using a drop tube, the baffeling is my wrinkle, at first I drilled small holes and used thin wire. Later I went to sheet metal screws to create a larger disruption to the powder charge as it dropped down the tube. The improvement in settling is measurable with a vernier calipher.

 

[swooshdave]

Did you get it it to idle down? What did you find?

No, in the winter I'm not as motivated to go out to the cold garage.

 

[swooshdave]

Slight update (weather has been improving). As I mentioned the carb spacer/gasket provided with the carb was pathetic at best. Probably best described as cardboard with dried tar. And not high quality cardboard. I suspected so air was actually sneaking in through the cardboard and that the recommended torque for the carb was too low for the spacer. So I cranked it down to "hand tight".

Now with the throttle screw backed off I'm getting it to idle in the 720-750 range when hot. I'm still not happy with that but at least it's drivable.

It will not run correctly with the PCV hose attached. So it's just laying there (for now) and the carb port is plugged up.

I'm thinking of taking the carb back off and trying a more traditional spacer/gasket. That will at least eliminate the cardboard as a suspect.

 

[Clay_in_ABQ]

I found that gasket strange, too, and really cranked down on it (relatively speaking) to make it seal. I think your idea is better: putting in a real gasket.