Wisconsin VH4D Spezifikationen PDF herunterladen (Seite 11)

GENERAL INFORMATION and DESIGN

Wisconsin engines are of the four cycle type, in which each

of the four operations of intake, compression, expansion

andexhaustrequires a complete stroke. This gives one power

stroke per cylinder for each two revolutions of the crankshaft.

COOLING

Cooling is accomplished by a flow of air, circulated

over the cylinders and heads of the engine, by a

combination fan-flywheel encased in a sheet metal

shroud. The air is divided and directed by ducts and

baffle plates to insure uniform cooling of all parts.

Never operate an engine with any part of the

shrouding removed .- this will retard air cooling.

Keep the cylinder and head fins free from dirt and

chaff. Improper circulation of cooling air will

cause engine to overheat.

CARBURETOR

The proper combusUble mixture of gasoline and air

is furnished by a balanced carburetor, giving correct

fuel to air ratios for all speeds and loads.

IGNITION SYSTEM

The spark for ignition of the fuel mixture is furnished

by a high tension magneto driven off the timing gears

at crankshaft speed..The magneto distributor rotor

turns at half-engine speed. The magneto is fitted with

an impulse coupling, which makes possible a power-

ful spark for easy starting. Also, the impulse coupling

automatically retards the spark for starting, thus elim-

inating possible kick back from engine while cranking.

Battery ignition (12 volt); distributor is furnished

place of magneto on engines equipped with flywheel

alternator or belt driven generator. See Pages 12-15.

LUBRICATION SYSTEM (Fig. 3)

A gear type pump supplies oil to four nozzles which

direct oil streams against fins on the connecting rod

caps. Part of the oil enters the rod bearing through

holes in the rods, and the balance of the oil forms a

spray or mist which lubricates the cylinder walls and

other internal parts of the engine. An external oil line

from the oil header tube in the crankcase lubricates

the governor and gear train.

GOVERNOR

A governor of the centrifugal flyweight type maintains

the engine speed by varying the throttle opening to

suit the load imposed upon the engine. These engines

are equipped with either a fixed speed governor, a

variable speed control to regulate the governed speed

of the engine, or an idle control.

ROTATION

The rotation of the crankshaft is clockwise when

viewing the flywheel or cranking end of the engine.

This gives counter-clockwise rotation when viewing

R.P.M.

1400

1600

1800

HORSEPOWER

17.2

20.0

22.5

2000 24.7

2200 26.5

2400 28.0

2600

2800

29.2

30.0

the power take-off end of the crankshaft. The flywheel

end of the engine is designated the front end, and the

power take-off end, the rear end of the engine.

HORSEPOWER

Horsepower specified in the accompanying chart is for

an atmospheric temperature of 60

Fahrenheit at sea

level and at a Barometric pressure of 29.92 inches of

mercury.

For each inch lower the Barometric pressure drops,

there will be a loss in horsepower of 31/~%.

For each 10

temperature rise there will be a reduc-

tion in horsepower of 1%.

For each 1000 ft. altitude above sea level there will

be a reduction in horsepower of 3~/2%.

The friction in new engines cannot be reduced to the

ultimate minimum during the regular block test, but

engines are guaranteed to develop at least 85 per cent

of maximum power when shipped from the factory. The

power will increase as friction is reduced during the

first few days of operation. The engine will deyelop

at least 95% of maximum horsepower when friction is

reduced to a minimum.

For continuous operation, allow 20% of horsepower

shown as a safety factor.

STARTING and OPERATING INSTRUCTIONS

Engines that are enclosed in a sheet metal house, as

shown in bottom view of Fig. 1, are called power

units. Others are furnished without a house, as shown

in top view of Fig. 1, and are called open engines.

On engines with a house, the side doors must

always be removed when operating.

This is necessary for circulating sufficient air for

cooling the engine.

LUBRICATION

Before starting a new engine, fill the oil base with

good "gasoline engine" oil, as specified in the =Grade

of Oil" chart. Fill through the breather tube shown in

Fig. 3, with 4 quarts of oil.

For run-in of new engines, use same oil as recom-

mended in Grade of Oil Chart.

After the engine has been run for a short time, the oil

lines and oil filter will have been filled with oil. Shut

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