That's OK Jim, we have lots of dumb answers. Got out my write it down or you will forget it book and it says with an APC 9/6 it turns 17,800 with the stock TT carb and 18,300 with a Perry 1301 while running on the ground with 10% fuel. These rpms sound allfully optimistic to me now but that is what I wrote down? I know it was with my first TT engine and it has always been my strongest TT36. Hope others will chime in here with there results.  Eric

     Your right Bill. This was with my first TT36 bought just after they came on the market. I've bought 4 more over the last couple of years and none of them has performed as well as that first one. I guess I should have reported on my later ones but they were always so disappointing after that first one that I never wrote down any of the times. I'm thinking they were around 1k lower but even at that for the money you cant complain to much.
     Jim Schneider from the Bay area has one that was reworked by Gardner (cant remember his first name) who was known for his racing K&B hop ups. I've seen Jim turn in the mid 18s on occasion so I had Gardner work on one of mine but it turned out to be very disappointing. I think these engines get better as they get run in and seem easy to set up as long as you don't use the carb that comes with them.
     Which OS engine are you running right now, I know you had a better HS time than I had last time we flew together?  Eric

My engine choices are the TT 36 or a Webra 32, both new.  Any experience with the Webra 32?

I'm working on a Brodak Guardian and plan to use one of these engines on it.  Don't really expect to fly in contests with it--just for fun, but who knows what may happen.

I understand that exhaust pressure isn't allowed; is there any reason to use the muffler?

Both the webra and TT36 work well for carrier. Both are seen often at Brodak's. The TT36 stock carb will not work unless used with muffler pressure. It has a collector ring setup attached to the fuel nipple and needs a boost. I replace the stock carb with an os 4D, an exact fit. The webra carb works ok on suction. I currently have the tt36 with a tuned pipe. It seems to be a couple of seconds faster than open face TT36's. A little tricky for carrier, but does work with a little extra tuning effort .