MVVS 58 User Manual

Operating instructions

MVVS 58 IRS / ProSport No: 3001 / 3001P

Version 1.7

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Before using the engine, please read these instructions carefully.

Congratulations on choosing the gas engine MVVS 58 / MVVS 58 ProSport.
MVVS 58 has been designed and manufactured for propeller-powered radio-controlled model planes. It is able to meet all of
your expectations of an acrobatic racing engine.

Technical specifications

Bore
Stroke
Weight of complete engine
without ignition*
Weight of ignition unit

RpM range

* Some manufacturers state the weight of incomplete engines. The value in the table above stands for the weight of a
completely assembled engine, including the spark plug, carburetor, drive washer and prop screws.

** Power output varies with the exhaust used. The value given in the table stands for the maximum available power output.

42 mm
42 mm
1820 g

165 g

1000 – 7500 RpM

Maximum power output **
Maximum torque **
Fuel

Lubrication

8.5 HP/6950 RpM

Unleaded 95-octane fuel

Oil with petrol in

mixture 1:40

Safety precautions:

1) Never use the engine for any manned vehicles.

2) When operating model planes, always follow the rules and laws in effect in your country.

3) The manufacturer declines all responsibility for all damages arising from the operation of models and other
appliances droved by MVVS 58 engine.

4) Always use original spare parts.

5) Never tamper with the engine construction.

6) Before each flight check that all the propeller screws are tightened up and in good condition. If you use a spinner,
check that it is tightened up, too. When mounting the spinner always follow the assembly instructions.

7) Periodically check that the engine is firmly fixed to the engine mounts. Never start a loose engine!

8) Always use a balanced propeller! Always replace the propeller when damaged!

9) Make sure that no part of your body intersects the plane of the spinning propeller.

10) Always wear close-fitting, well-fastened clothes when starting or operating the running engine. Never wear loosely
hanging clothes (ties, scarf, etc.).

11) Never try to stop the engine by any part of your body.

12) Always stop the engine either by turning off the ignition switch or by completely closing the carburetor throttle
valve.

13) Before starting the engine always make sure that the model is safely fixed in place and cannot start moving.

14) Fuel is combustible and therefore must be kept in an enclosed container at a safe distance from the engine when it
is running.

15) When preparing fuel carefully follow the manufacturer’s or dealer’s instructions.

16) Small objects must be kept at a safe distance from the engine when it is running. Never throw any objects towards
the spinning propeller.

17) Be careful in choosing the location where you wish to start the engine. Avoid dusty or sandy areas.

18) Start the engine in well-ventilated areas only. Never start the engine indoors.

19) When starting the engine make sure that bystanders, especially children, are at a safe distance of at least 10 m.

20) The engine power output makes it possible to fly big models. Mal-operation of such models may cause serious
damage. Start using the MVVS 58 in model planes only after you have mastered operating smaller models.

Selecting a suitable propeller

It is usually the case that propellers of the same dimensions coming from different manufacturers are not the same.
Oftentimes not even propellers of the same dimensions produced by a same manufacturer are not the same. The engine power
is best utilized when the propeller dynamics curve and engine power curve (revolutions / power output) intersect in the area
of the engine top power output. Unfortunately, no propeller manufacturer provides this information. Engine power output is
also a variable quality. It depends above all on the silencer used and can considerably vary. The situation is further

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complicated by environmental parameters (temperature and atmospheric pressure in particular): low temperature and high
pressure increase propellers’ input requirements by 20% in comparison with input at hot weather.

MVVS 58 has been designed to generate maximum power at 6800 – 7100 RpM, according to the type of exhaust used. If you
wish to utilize the maximum power output, choose a propeller, which allow the engine to reach these revolutions, or slightly
lower revolutions (given the unloading of the propeller depending on the speed of flight) on the ground.
We do not recommend using propellers with which the engine reaches more than 7500 RpM on the ground.

Suggested propeller dimensions:

two-blade propellers:
22x10, 22x12, 22x14
24x8, 24x9, 24x10, 24x12
25x7, 25x8, 25x9, 25x10, 25x12
26x7, 26x8, 26x9, 26x10

three-blade propellers:
22x10, 22x12
24x9, 24x10, 24x12

These values are only approximate and may vary with the factors described in the previous section, as well as with the type
of the exhaust system used.

Note: If the propeller is thinner than 21 mm (see fig.) use an additional washer (catalogue No. 3001 1104). On the other hand,
the thickness of the propeller with washers must not exceed 36 mm if standard propeller screws are used.

Fig.

Fuel

Always use unleaded 95-octane petrol mixed in the proportion 40 volume units of petrol to 1 unit of Mobil Racing 2T oil. If
necessary, quality brand-name synthetic oil intended for racing two-stroke engines can be used too.
Running the engine in, use MVVS Racing 2T oil, which come with the engine. Mix it in the proportion 30:1.
Never use inexpensive oil developed for garden appliances or synthetic oils intended for the operation of methanol model
engines. The manufacturer declines all responsibility for all engine damages arising from the use of low-quality fuel.

Assembly

The engine is fastened in place with four holders built in the rear cover. The rear cover is adjustable by 90° which ensure easy
access to the carburetor’s operating elements. The engine can be mounted directly to the firewall or an assembly kit can be
used (special accessories). Use M6 screws or screws M4 with a reduction kit (special accessories). If you decide to fasten the
engine using flexible motor mounts, always choose parts with enough solidity and strength. Make sure to secure the screws
against loosening and regularly check that they are tightened up and in good condition.

Since air is used to cool the engine, sufficient air circulation under the cowl must be ensured. Never forget about a hot air
outlet – which must be bigger than the intake. Gas engines heat up to a much greater degree than methanol ones!

Do not forget that the engine needs oxygen from the air to be able to operate. Therefore ensure access of air to the engine
intake as well. Caution: intake of warm air from beneath the cowl may cut the engine power output.

Note: Attach a hose to the airpressure inlet on the carburetor and terminate it outside the cowl.

Caution!
When mounting the engine in the model use seals to protect all openings and prevent the pollution of the engine’s inside
with sawdust, residual abrasives etc.

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