BGI,

Nice of you to notice and to respond.

Manufacturers who are somewhat responsible do tend to be overanxious. Running the TT .91 through three litres of fuel, at 4K-5K RPM, will not cause the engine any damage whatsoever. It will only be a waste of fuel, which could have been used for flying.

During this type of break-in, the engine is making about 1/8-1/12 of its intended maximum horsepower. Most non-glider models will not take-off with such low power.

1-1.5 litres (or quarts...) and 65-75% of the intended maximum RPM should do the job just as well. With temperatures a glow engine experiences, the cylinder will not be glazed with oil residue either.

While OS tell us how to perform break-down on the engine, TT only runs us through a more tedious, over-careful break-in.

Sincerely,