The combustion chamber of RL type engines is principally of the
same shape as that of the RND-M. The cylinder cover is basically a
one-piece steel block with cooling bores, while an identical arrangement
of bore cooling is applied to the upper collar of the cylinder liner
which is made from lamellar cast iron, a material of good heat
conductivity and wear resistance. Figure 12.41 shows the arrangement
with cover, cylinder liner and piston.