The excess flow capacity in the transfer passages of glow ignited engines, with regard to converted glow-to-diesel engine operation has been discussed at length in this forum. Mainly, comments confirm that (many) converted glow engines seem to reach max RPM at partially open throttle - between 2/3 and 3/4 open.

I mentioned, possibly in a post somewhere in here, that a converted Fox 15BB ran very nicely, but was excessively thirsty. Also, that the exhaust spewed considerable droplet-containing content. I mentioned my intent to "stuff" the 3rd, or boost, bypass port in the sleeve.

Which I did about that time. I finally found opportunity to run the engine again. After a few juicy and low-compressed runs to start restoring running fits, I observe that the engine has a much less juicy exhaust, can be set to higher comp/leaner needle running, and that duration per unt of fuel volume is much increased.

The engine is still fairly "low-time since overhaul," so I'm not pushing for ultimate settings just yet. Starting and setting sre at least as simple as before the boost channel was blocked off. RPM, running easily on an APC 8-4 sport prop, was almost 1,000 RPM above what I got running in stock-case condition. So, blocking the 3rd transfer channel seems to, at least, do no harm... As I add run-time on the engine, I may pass along the results - good, bad, or not worth th effort...