HO 2-8-0 chuff rate still problem

[MarkInLA]

I may have submitted this same question some time ago but am still in the blind on this:
Why is it seemingly impossible to get chuff rate in sync on this engine...Others have suggested this and that with 'loadable speed curve' setting bit 4 of CV 29 to 1 and then CV 25 to 16... 67-94 to theses, 10 to this, 209, 210, 66, 95, etc....But, no matter what I do it just does not syncronize the way my 2-6-0 does..It is next to perfect since day one, and is not even Spectrum..With Spectrum connie roll-off can be OK but not at speed ..Or, at speed OK, but not at roll off....

[rogertra]

How many chuffs per revolution of the wheels are you aiming for?  It should be four chuffs per revolution.

[MarkInLA]

rogertra, I know since 1957-ish it's 4 per rev, 2 per side...This is what it will not accomplish..(as mogul always has ).. if I didn't know this how else would I know it's not correct ?

[rogertra]

rogertra, I know since 1957-ish it's 4 per rev, 2 per side...This is what it will not accomplish..(as mogul always has ).. if I didn't know this how else would I know it's not correct ?

Sorry, don't know your level of expertise so I played safe.  There's a very wide range of railroad knowledge on this board, ranging from very little to quite extensive.

I just Googled "bachmann 2-8-0 chuff rate" and found several possible answers to your question this is one: -

"Run your engine at a typical speed.

Then adjust CV116 to get 4 chuffs per driver revolution at your
most typical running speed. Its not possible without a cam to get it
always perfect over the entire speed range, so you select the range
where it is best. The result is usually acceptable."

You may need to install a cam if the exact chuff rate is important to you.

If this doesn't help, Google is your friend.