The only TT sport engine that still uses a chromium plated sleeve is the .36PRO.

All the others are ABN.


Britbrat,

Have you seen a full size engine's piston that succumbed to fatigue?
I have. It broke clean through the oil ring groove.

The crown actually sepatated from the skirt...


Model engines run at a much higher relative load, compared to auto engines.

There is no speed limit where we fly....

With cars, 90% of the time they are at a 20% load, or less.

Cruising at 60 mph takes about 13-19 HP, of the 100-200 the engine can produce.


So model engine pistons are prone to fail much sooner, from metal fatigue.