Rl Type Engines

The RTA engine's immediate predecessor in the Sulzer low speed programme was the loop-scavenged RL series, of which examples remain in service and merit attention here.

The RLA56, a small bore two-stroke engine introduced in 1977, incorporated the basic design concept of the successful RND and RNDM series but extended the power range at the lower end. This engine, of comparatively long stroke design, was the first model in the RLA series. It retained many of the design features of the then most recent economical loop-scavenged RLB type (Figures 12. 36 and 12.37), both engines using many features of the earlier RND-M series.

Figure 12.36 Cross-section of Sulzer RLB90 engine

A number of RND-M engine features were retained for the RLA and RLB type, namely:

• Constant pressure turbocharging and loop scavenging.

• A bore-cooled cylinder liner and one-piece bore-cooled cylinder cover and water-cooled piston crowns.

• Double guided crossheads.

• New cylinder liner lubrication system with accumulators for the upper liner part and thin-walled aluminium-tin crosshead shell bearings.

Major new design features peculiar to the RL types were:

• A new bedplate design with an integrated thrust block; a new box type column design.

• A semi-built or monobloc type crankshaft without a separate thrust shaft.

• Location of the camshaft gear drive at one end for engines of four to eight cylinders.

• Multiple cylinder jackets.

• A bore-cooled piston crown.

• Modified crosshead.

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