Site Links:
Engine Links:
3701S - 2 cycle
100hp
|
|
|
3701S -
100Hp electric start &
3
carburetors.
|
$9815.00
|
|
3701S -
100Hp elec,st, carbs & G-50 gearbox
|
$10,920.00
|
|
3701ES-
100Hp electric start &
fuel
injection.
|
$11,732.00
|
|
3701ES 100Hp
with elec, start, fuel
inj. & G-50 gearbox
|
$12,834.00
|
|
Oil
Injection Option
|
$431.00
|
|
The 3701 is Hirth's water-cooled alternative to
the popular F-30 air cooled engine. 3701 is offered carbureted or
with optional fuel injection. Standard engine is pre-mix and oil
injection is available for either the carb or fuel injected versions.
A narrow engine profile with a single tuned exhaust used for all 3
cylinders allows the 3701 to be used in compact engine compartments.
Pistons fire 120 degrees apart resulting in a very smooth power
curve. 3701 fuel consumption rivals similar Hp 4 cycle
engines.
3701 incorporates Al-Nikasil coated cylinders for
superior performance and reliability. Nikasil provides for a super
low coefficient of friction, reducing engine heat and wear. The
pistons and cylinders expand at the same rate thus providing for a
seizure resistant engine. 3701 crankshaft is 4130 chrome molly steel.
Heads, cylinders, rings, block casting, connecting rods and
associated components are all of the highest grade alloys available
today.
|
Model:
|
3701
|
Carburation:
|
Triple 34mm slide or optional electronic fuel
injection
|
|
Engine Type:
|
2 cycle, 3 cylinder
|
Fuel Pump:
|
Auxiliary external pneumatic - 12VDC with fuel
injection
|
|
Bore:
|
76mm
|
Lubrication:
|
Fuel mixed with oil @ 50:1 or optional oil injection
|
|
Stroke:
|
69mm
|
Rotation:
|
Counter clockwise, viewed from output end
|
|
Displacement:
|
939cc
|
Starter:
Alternator:
|
12 volt electric,
250 watt/20 amp alternator standard
|
|
Compression:
|
9.5:1
|
Cooling:
|
Water cooled
|
|
HP Output:
|
100Hp @ 6000Rpm
|
Weight:
|
108 lbs- including electric start and exhaust. With
optional gearbox 127 lbs. (does not include radiator)
|
|
Peak Torque
|
88 Ft.Lbs @ 5500Rpm
|
Reduction Units:
|
G-50 gearbox available in 2.16:l, 2.29:l, 2.59:l, 3.16:l
and 3.65:l ratios or optional G-40 gearbox can be used if
clutch is required.
|
|
Ignition:
|
Dual CDI
(Capacitive digital Ign.)
|
Drive Coupling:
|
Elastomeric dampener with G-50 gearbox or optional
centrifugal clutch with G-40 gearbox. (2.03:1, 2,25:1,
2.64:1, 2.96:1. 3.33:1)
|
3701 is offered in two separate Hp versions. This
is done through engineering by changing the piston port timing.
Placement of the port timing determines what Rpm the peak torque is
achieved. When peak torque is arrived at low Rpms the peak Hp of the
engine is less but the torque curve in mid range is very flat. Such
an engine gives up some thrust at full power but has high torque in
the mid range allowing for very low engine RPM at cruise power
settings.
The same engine with the port timing set high will
produce much more Hp and thrust at full power. Peak power is at a
higher Rpm which means that the cruise Rpm will also be at a higher
Rpm. By offering the 3701 with two different Hp ratings it will be
possible to choose the power requirement that best fits the
application.
3701 High torque/low rpm engine - Peak power - 84
Hp at 4950 RPM. (Now available)
3701 High performance engine - Peak power - 100 Hp
at 6000 RPM.
Top of Page