I have a RoJett BSE 40 RE and a header muffler. If I wanted to run muffler pressure where is the best place to put the pressure tap? Or is it better to stick with the uniflow tank without using muffler pressure? Do you have any comments on the run characteristics of muffler pressure for the BSE 40 RE?

  I have never run the 40 myself, just helped Billy and Bobby at some team trials.

   Generally, I prefer to *not* run pipe pressure, if nothing else, it's one more potential failure mode. But if I was still running the PA61, the way we had it, I would go back, because our setup was far too sensitive to ram air effects (which burned me heavily at the 2003 NATs - when I *should* have been running pressure). My RO-Jett 61 system is very insensitive to the same effect, and I run just ram air into uniflow. Any of these engines have plenty of fuel draw with spigot venturis of any reasonable size for stunt that you won't have to run pressure just to get it to work, if it does need that, the venturi is too big or configured incorrectly.

    Put the tap on the big end of the divergent cone of the pipe. It's worth experimenting with, once you get the thing running otherwise correctly. 

    Brett

Ive been running this exact motor for a couple of years now and randy is correct. No pressure is best. I use a 4.5 oz uniflow tank with uni vented to airstream on inboard fuse side. Brian Eather 11 x 5 prop tweaked to 4.7 or so.
This is in a legacy 40 with bob hunt foam wing. Weight is 50 ozs. Setting is 9.2 rpm and this gets a light 4 2 break with 5.3 laps. Pressure caused the motor to go way too rich on downward parts of the maneuvers. This is a very sweet and moderately powerful engine, or at least mine is. 1 flip starts and dont usually touch the needle from week to week.

. Ts. 1 flip starts and dont usually touch the needle from week to week.

Also true for RO-JETT 61RE.  (a boring motor because nothing ever goes wrong with it)