DLA ENGINE OPERATING-INSTRUCTION
MANUAL
06/29/2016 Copyrighted Material
Owner’s Manual All Rights Reserved 03180-10000
Page - 25 DLA 32, 58, 64, 64-I2, 116, 116-I2 & 128cc, 180c, 232cc Rev. A.05.11
over the engine’s cooling fins. In such a case, some air flow directivity may be required, through
the use of “air damns” or vanes.
The QUAD and the In-Line engines require special air flow considerations. Since both types have
one or more rear cylinders that are in the “hot-air shadow” of the forward cylinder(s), it is the
pilot’s responsibility to provide adequate cool air flowing across the rear cylinders.
In the case of the QUAD, one typically directs the airflow from the cowl intake to an area
(chamber) above the cylinder heads and then directs the air to flow downward across both
forward and rear heads. (See diagram)
The same airflow principals would also apply to the 116cc In-Line engine.
TEMPERATURE, ENGINE, LIMITS:
The engine head temperature should never be allowed to reach or exceed 120
O
C (248
O
F) and the
crankcase should be restricted to 70
O
C (158
O
F). Here is where some temperature measurements
and perhaps temperature telemetry might be quite useful. On hot flying days, > 95
O
F, you may
consider richening the “rear” carburetor’s high-end needle and reduce the rpm by ~ 200 to help
cool the engine.
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