Hello Bill Baxter,

I may have started this hype about the OS break-in procedure being incorrect.

I started the thread about: "Break-in in tapered bore engines",

http://www.rcuniverse.com/showthread...59&forumid=145

I have my own 46FX, which has been broken-in by the vendor who sold me a pre-built WM T-34 ARF. It was clean and I believe, not used. I don't know what break-in method was used. The muffler baffle was removed by the vendor.

I have only used commercially available, 5% nitro, Model Technics, Morgan Omega and Byron Sport fuels, to which I added Castor oil to a total of 20% lubricant (I use the same fuel also for my MVVS engines, who specify 20% oil).
The props I use are MA 11x6 and Bolly 11.5x6 (and for a short time a 10.5x8). Reliability has been exemplary; never did I have to land with the engine off, unless I intentionally shut it down in the air. It never had a lean run either. It went through two glow plugs, which needed replacement because the element became scaled. I am on my 3rd OS No.8.

The engine, although about two years old, has a total of only 30-40 hours on it, on paved runways (no sandy environment) and lately has been performing less than satisfactorily.

Although idle and starting are OK, warm compression is low and power is low as well. I can only get about 11,400 RPM on the Bolly 11.5x6, and maybe a little over 12K with the 11x6 MA.

The Bolly 10.5x8 used to show 12,300 RPM, but I haven't tached it with it lately.

I removed the head and found no trace of peeling on the liner (a problem, from which a .40 FP I had did suffer. I conversed with Mr.Clarence Lee of RCM about it), although it seems to be shiny black, instead of being chrome like shiny.

Could my engine be worn out after so little running time?

You can reply to my E-mail: [email protected]

Please give my regards to Ms. Anne-Marie Cross, although I disagreed with her, about a problem I still have with my 6XAs... It is very usable non-the-less.

Sincerely,,