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The Titan ZG 62 was first produced in 1985 being originally intended for chain saw use. Many people still believe that chain saw engines are too heavy for models, and that these motors run too roughly. To remain competitive, these chain saw companies must continually invest very large sums of money in research and development to improve their engines, making them as light as possible, smooth running and powerful. The cost for such development requires huge sums of money, and these large development costs are only possible due to the high volume of sales of chain saws. Model engine manufacturers cannot sustain such enormous development costs. Another very important point is that chain saw customer has exactly the same requirements of his chain saw as does the modeller of his model airplane engine. These are: light weight, minimum vibration, power, reliability, minimum maintenance and more recently low noise levels. In 1990 Komatsu reworked the cylinder especially for model aircraft purposes, creating the ‘S cylinder'. This had the transfer passages altered as well as the combustion chamber. The newest Titan, the 62SL, has a die-cast aluminium crankcase weighing 50 grams less than the previous sand cast version.
With the Titan ZG 62SL, these requirements are arrived at in two ways. The 62 has a very short stroke, this has two advantages, first is the motor is shorter thereby and second, the piston acceleration is not as high reducing vibration. The latest die casting technology is employed to produce very wide but very thin cooling fins and the flywheel is unbelievably small and with the very light ignition system. The crankshaft is 15mm diameter forged steel, induction hardened, with two large ballraces. The conrod is a forged unit also induction hardened with caged roller bearings both ends. The ignition unit consists of two separate coils, both fixed to the side of the motor causing no interference with the cooling air. The standard Walbro pump carburettor is fitted with a choke. The newest Titan, the 62SL, has a diecast aluminium crankcase weighing 50 grams less than the previous sand cast version. Also now has a new silencer and 40mm Prop Hub as standard. | SPECIFICATIONS | ZG62 SL | | Capacity | 62cc | | Bore | 47.5mm | | Stroke | 35mm | | Power ( Std Exst ) | 4.7PS | | Length ( Inc.mount ) | 162mm | | Height ( Inc plug cap ) | 175mm | | Weight ( Inc Exst ) | 5lbs |
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