Evolution-engines EVOE33GX Manuel d'utilisateur télécharger pdf (Page 10)

Engine Break-in

Your new engine needs to be broken-in to ensure a long life of all the components. This engine

features a piston ring design, which requires a speciﬁc break-in procedure to ensure a tight seal

between the piston ring and liner. For this to be accomplished, this process requires repeated

heating and cooling cycles, and must be done at a needle setting that is slightly rich of peak to

ensure the ring expands and contracts. The ring needs to “grow” into the liner for it to develop a

good seal.

Breaking in the piston ring and liner by running it too rich does not provide the necessary parts

growth to accomplish the needed piston ring and liner ﬁtting. However, using too lean of a

setting will cause the ring to become damaged by overheating. Please follow the steps below to

ensure a successful experience.

Important considerations during break-in

• Perform the break-in process with the

engine mounted on your airplane. There is

no need to bench-run the engine prior to

mounting it on your airplane.

• Use the suggested break-in prop to begin

your break-in process. This provides a light

load and high rpm that, when matched

with the heat of the engine, will break in

the engine properly.

• Use the proper recommended fuel with a

20:1 gas to oil ratio for the rst gallon of

operation.

The proper break-in ﬂight procedure is to ﬂy

the airplane at full throttle through a series

of gure eight maneuvers (i.e. Cuban Eight).

These maneuvers in particular beneﬁt the en-

gine because, when climbing, the additional

load on the engine will increase the tempera-

ture and, when diving, the lighter load and

higher rpm will decrease the temperature,

thus providing the heating/cooling cycles

required for the break-in process.

Break-in process

• Firsttankoffuel: Set the high-speed

needle valve at 1.5 turns out and use the

suggested break-in prop. Run the engine

on the ground for its ﬁrst tank of fuel and

DO NOT go above half throttle. Cycle the

throttle between idle and half throttle every

minute.

• Second tank of fuel: Tune the needle valve

to be slightly rich of the peak RPM at full

throttle without a drop in RPM. Do not run

at full throttle on the ground for more than

30 seconds at a time. Tune the low speed

needle valve for a smooth transition from

idle to mid-range, go back to full throttle

to conﬁrm the main needle valve setting

and then ﬂy. During this ﬂight, be sure to

be conscientous of extended periods of

heating the engine. Be sure to mix-in some

cool-down dives and lower-throttle ﬂying.

• Third tank of fuel: Fly the engine at a high

throttle while performing the recommended

ﬁgure eight maneuvers. This will help the

piston ring and cylinder liner to expand and

contract; helping the breaking-in process.

Tune the needle valve to be slightly rich of

the peak RPM as necessary.

• Fourth tank of fuel: Select one of the rec-

ommended propellers for normal operation

and mount it on your engine. Tune the main

needle valve to be slightly rich of the peak

RPM and the low speed needle valve for a

smooth transition from idle to full throttle

and continue to break-in the engine in

ﬂight.

Do not worry about an engine setting being

slightly rich during this process. When set

correctly, the engine will occasionally sound

as if it is misring (which it is). During the

climbing maneuvers this should go away and

might return during the diving maneuvers. If

it does not go away during the climbs, land

the airplane and lean the high-speed needle

by 1/16 of a turn, then take off and y again.

Enjoy the break-in process—you are doing a

lot of ﬂying.

Fly the airplane through the ﬁrst gallon of fuel,

then you can change the fuel mixture to 32:1

for continued operation.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 18 19

Commentaires sur ces manuels

Pas de commentaire

Evolution-engines EVOE33GX Manuel d'utilisateur Page 10

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Evolution-engines EVOE33GX