Horizon Hobby Evolution Radial Glow E777 Manuel D'instructions page 6

EN
4. Make sure the fuel tank is no farther than 100mm (4 in) from the back of the firewall.
The center of the fuel tank should be in line with the carburetor to prevent fuel siphoning.
• You do not need to use a fuel pump with Evolution radial engines
• Always use a fuel filter inside the fuel tank
• We recommend using medium (3mm) or large (3.5mm) inner diameter fuel line
• Make sure there are no sharp bends in the fuel line between the fuel tank and the engine.
5. Attach the throttle servo linkage to the throttle bellcrank on the engine mounting plate.
Attaching the Included Glow Plug Harness
Your engine includes a 7- or 9-cylinder glow plug harness. Attach the red wired harness to
each of the cylinders and run the battery lead to a convenient mounting point for your glow
plug connector. We recommend installing the glow plug connector in the cowl or the side of
the fuselage. Remove one of the rear crankcase cover bolts. Attach the black wire to the bolt
and install the bolt in the crankcase cover.
Keep the overall length of both the red and black glow harness wires as short as possible
so the highest possible voltage will reach your glow plugs.
Glow Plug Starting Battery
The starting battery or on-board battery (whichever you prefer) should be a 1.2 V 6000–8000
mAh battery pack. We've had success building a pack of (6) 1300–1600 mAh NiCd (preferred)
or NiMh (takes longer to cycle to full capacity) 1.2v battery cells wired in parallel so the total ca-
pacity is 7800–9600 mAh. The total draw on 7 glow plugs at 2.2–2.7 amps per plug is 15.4–18.9
amps. With a 7800–9600mAh battery pack, you can expect about 30 minutes of 'on-time'.
Once the engine is broken in, you will likely find that the engine idles and runs very well
without an on-board battery.
Installing On-Board Glow Drivers
Although Evolution Radial engines run just fine without constant glow heat applied, the use
of on-board glow drivers allows for easier engine starting and can ensure adequate heat in the
glow plugs at all times. This is particularly important on radial engines where oil collects in the
lower cylinders. SonicTronics/McDaniel RC on-board glow systems work very well with Evolution
radial engines.
7-cylinder applications: MCD477
9-cylinder applications: MCD479
We recommend installing the glow driver socket on the side of the cowl or fuselage and keeping
the battery wires as short as possible. Longer wires between the battery pack and the glow
drivers will reduce the amount of glow plug heat.
Attach the ground wire to one of the engine backplate screws or the crankcase.
Engine Cooling Requirements
It is very important to consider adequate cooling inside the airplane cowl. Engines require
a cooling airflow exhaust:intake ratio of 3:1 to 5:1. A large open cowl may lead you to believe
there is adequate cooling; however, you must make sure air is flowing through the cowl and
the cylinder head fins. Achieving the proper ratio typically requires cowl and/or engine
baffles to reduce the open intake area.
1. Ensure there is adequate cooling air moving through the cylinder head cooling fins.
The intake air tends to move through the path of least resistance (between the cylinders)
instead of through the cylinder cooling fins.
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