User Manual

GS R/C

DLA ENGINE OPERATING-INSTRUCTION

MANUAL

08/20/2014 Copyrighted Material

Page - 25 DLA 32, 58, 64, 116, 116-I2 & 128cc Rev. A.05.01

CAUTIONS:

1. Advancing the timing causes the engine to run hotter. (See Temperature Limits)

2. Advancing the timing typically increases the power…. to a limit.

3. Advancing the timing, may make the engine harder and more dangerous to start.

4. Advancing the timing is harder on the engine and advancing beyond 32

voids the

warranty.

COWL DUCTING and AIR FLOW

Be sure that the cowl openings are sufficient to provide adequate airflow across the DLA cylinder

head’s, cooling fins. Generally, the “rule-of-thumb” is to have the air exit holes to be three (3)

times the size of the air intake. If the air intake is too big, sufficient air flow may not be directed

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.