SHOP MANUAL
Engine
Ch 1 page 100
Pistons
The pistons which are used in DA40 engine is of type; articulated pistons.
Articulated pistons are split and have an aluminium skirt and a steel crown.
(For the aluminium piston to resist the high pressure and high temperature prevailing in the com-
bustion chamber, the material is thicker at the piston crown and piston ring grooves than in the
remainder of the piston.)
One of the advantages of articulated pistons is that they can tolerate higher loads than conventional
pistons completely made of aluminium.
As the piston crown is made of steel it can withstand higher temperatures and pressure in the com-
bustion chamber.
This enables more power to be extracted from engines with articulated pistons.
Figure 190
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