Originally posted by FCC
TT engines are ABN not true ABC.
True but so are most other engine's presently offered including many OS engines. The ABC designates aluminum/brass/chrome in our case chrome plating. ABN designates aluminum/brass/Nickel plating.
Secondly they are the most sensitive engines available in the market. If you change spinner/prop or any load on crank shat the performance will vary much. These engines are also very sensitive to dust and moisture, and if there is a dust layer in the air you will definitely lose some compression with these engines.
These all factors are due to internal metallurgy of the piston, sleeve and crankshaft material.
Interesting analogy, however all engines, any engine will suffer from a moisture and dust rich environment... All engines will loose compression due to the accelerated wear associated with dust particles. Moisture is an unwanted byproduct and is prone to be prevalent in our fuel as well. Moisture will cause premature bearing failure, little if any culpability is allowed for accelerating engine wear, under normal circumstances.
The effect metallurgy will have on any model engine is the ability to with stand abuse from the continuous heat cycles and or extended use. The science of metallurgy in our world has more to do with the ability of these dissimilar metals to grow and shrink proportionately for the desired effects of the given component use. Given the piston; a high silicone content aluminum, the cylinder of brass or aluminum, plated with chrome or nickel are dissimilar materials. An engine with this metallurgy technology relies on the expansion and contraction of these dissimilar metals to achieve a compression seal, with the relationship of when and how these particular metals react under use [heat] it's a wonder they function for any length of time at all.