3701- engine shown with dual ignition and 90 degree exhaust manifold

Technical Data: Model: 3701 - 2 cycle, three cylinder inline

Reed valve induction. Bore: 76 mm Stroke: 69 mm Displacement: 939 cc Compression: 9.5 : 1 HP Output: 100hp @ 6000 rpm Peak Torque: 88 ft. lbs. @ 5500 rpm Ignition: Single CDI (Capacitive Discharge Ignition) TBO 1,000 Hrs. Rated at 75% power

Ign.Timing@2000 Spark Plug Heat VI.

Spark Plug GapNo. of Injectors

Do Not Peak HP RPM

HP @ Peak RPMPeak Torque RPMPeak Torque Ft.Lb.

Maximum CHTMaximum EGT @ full power

Maximum EGT @ cruise powerMaximum coolant temperatureMinimum coolant temperature

engine shown with dual ignition and 90 degree exhaust manifold

3701

The 3701 is Hirth's first offering of a waterengine for the aircraft market.

A narrow profile and single tuned exhaust used for a113 cylinders allows the 3701 to be used in compact engine compartments. Pistons fire 120 degrees apart resulting in very quiet & smooth operations.

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 chromemolly cylinders, rings, block casting, connecting rods and associated components are all of the highest grade alloys available today.

2 cycle, three cylinder inline Carburetion: Electronic suction pipe fuel injection Fuel Pump: 90 PST 12VDC electric fuel pump. Lubrication: Premix -40:1 or optional oil injection Rotation: Counter clockwise, viewed from output end Starter: 12 VDC electric / 240 watt generator Cooling: Liquid cooled. Weight: 108 lbs, including complete exhaust & starter.

Single CDI (Capacitive Discharge Ignition) 1,000 Hrs. Rated at 75% power

3701 TECHNICAL DATA

Engine 3701S--100Hp Ign.Timing@2000 - Fuel injected 18 deg

Spark Plug Heat VI. 280 Spark Plug Gap .020-.024 No. of Injectors Three

Do Not Exceed RPM 6300 Peak HP RPM 6000

HP @ Peak RPM 100 Peak Torque RPM 5500 Peak Torque Ft.Lb. 85

Maximum CHT 390 Maximum EGT @ full power 1256

Maximum EGT @ cruise power 1330 Maximum coolant temperature 240 Minimum coolant temperature 160

3701- 100Hp

The 3701 is Hirth's first offering of a water-cooled engine for the aircraft market.

A narrow profile and single tuned exhaust used for a113 cylinders allows the 3701 to be used in compact engine compartments. Pistons fire 120 degrees apart resulting in very quiet & smooth operations.

Nikasil coated cylinders for rior 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 chromemolly steel. Heads, cylinders, rings, block casting, connecting rods and associated components are all of the highest grade

Electronic suction pipe fuel injection 90 PST 12VDC electric fuel pump.

40:1 or optional oil injection Counter clockwise, viewed from output end 12 VDC electric / 240 watt generator

108 lbs, including complete exhaust & starter.

Assy 17813 Form 17403

This wiring diagram is to be considered as a proposal for wiring

General size of line wire: 1,5 mm2

Size of line from/to E-Starter: 16 mm2

Rectifier-regulator mount on cooling body (ca. 250x200x5mm)

* Minimum distance to other current wires: 100 mm (4 in.)

This wiring diagram is to be considered as a proposal for wiring

regulator mount on cooling body (ca. 250x200x5mm)

* Minimum distance to other current wires: 100 mm (4 in.)

f e d c Wiring diagram CDI

PVL 3701

b a Tag Name

- - Nr.

Tag Name 03.07.01 Rögele 03.07.01 Rögele

Wiring diagram CDI - single ignition PVL 3701

Nr.

Form 17690

Spare part list

Engine

3701

100 HP

Fig. No. Quantity. Designation Part. No. Neoteric Part No

10 1 Crankcase, complete 370 A1u 7160 Incl. 10a-10c 10a 1 Crankcase, downside 370 A2 7161 10b 1 Crankcase, upside 370A3 7162 10c 12 Stud screw DIN 835 M8x85 7163 20 3 Hexagon head screw DIN 933 M6x10 6927 30 3 Sealing ring, aluminum DIN 7603 6,5 x 9,5 x 2 5629 40 8 Hexagon head screw DIN 933 M5x8 7165 50 8 Washer DIN 9021 5,3 7166 60 11 Serrated lock washer 053.8/6 6902 70 5 Cylinder screw DIN 912 M6x25 6901 80 2 Cylinder screw DIN 912 M6x30 2289 90 4 Cylinder screw DIN 912 M6x35 6911

Form 17691

Crankshaft 3701

complete crankshaft contains Pos. 1040

Fig. No. Quantity. Designation Part. No. Neoteric Part No 10 1 Crankshaft 371 A 1 u 7167 20 1 Deep grove ball bearing DIN 625 6206C3 7168 25 1 Deep grove ball bearing 047.5 7169 30 2 Shaft sealing ring 055.24/1 5453 40 1 Deep grove ball bearing DIN 625 62062RSC3 7170

Form 17692

Cooling system 3701

Form 17693

Cooling system 3701 Fig. No. Quantity Designation Part. No. Neoteric Part No

l0 2 Inlet intermediate piece S1195/306 7171 20 2 Inlet end piece S1195/307 7172 30 2 Inlet intermediate piece S1195/308 7173 35 2 Plug 083.13 7174 40 5 Hexagon head screw DIN 933 M6x10 6927 Loctite 242 45 1 Hose nipple 270 K4 5630 50 6 Sealing ring, aluminum DIN 7603 6,5x9,5x2 5629 60 3 Extension connecting piece S1195/316 7175 65 6 Cylinder screw DIN 912 M6x20 2292 70 9 Sealing joint 157 W4 6095 80 12 Cylinder screw DIN 912 M6x35 6911 Loctite 242 100 18 Locking washer 053.8/6 6902 110 4 Coolant hose 373 A4 7176 120 4 Hose clamp 063.31/1 7177

1 Water pump and housing 373 A13U 7178 Contains Pos. 130-240

130 1 Water pump 373 A9U 7179 140 l Sealing joint f. water pump 013.7/1 7180 150 l Holder for water pump

clamping S1195/312 7181

160 1 Cylinder screw DIN 912 M5x20 7182 Loctite 242 170 1 Washer DIN 125 55,3 6936 180 3 Cylinder screw DIN 912 M6x40 7183 Loctite 242 190 2 Washer DIN 125 B6,4 6916 200 1 Washer DIN 9021 B6,4 5996 210 1 Casing for water pump S1195/321 7184 230 1 Hexagon head screw DIN 933 M6x10 6927 Loctite 242 240 1 Sealing ring, aluminum DIN 7603 6,5x9,5x2 5629 250 4 Stay bolt DIN 976 M8x55 7185 Loctite 242 255 4 Hexagon head nut DIN 936 7186 Loctite 242 260 4 Hexagon head nut DIN 936 M8 2292 265 8 Hexagon head nut DIN 934 M8 7187 270 12 Washer DIN 125 B8,4 6162 Loctite 242 280 1 Pulley S1195/302 6645 290 3 Cylinder screw DIN 912 M6x14 7189

300 3 Washer DIN 125 B6,4 6916 310 1 Pulley S1195/303 6646 320 4 Cylinder screw DIN 912 M6x14 7189 330 4 Locking washer 053.8/6 6902 340 1 V-Belt 043.10/1 6104 350 2 Coolant hose 90° 373 A5 7190 360 1 Connection tube S1195/311 7191 370 4 Hose clamp 063.31/2 7192 380 1 Hose 062.33/230 7193 390 2 Hose clamp 063.20 6915 400 2 Hose nipple 270 K4 5630

Form 17694

Ignition lighting system single ignition 3701

Fig. No. Qty Designation Part No. Neoteric Part No Remark note 10 1 Armature plate, complete 021.44/1 6564 20 1 Grommet 034.36 7194 30 2 Cylinder screw DIN 912 M5x20 7182 Md=4-4,5 Nm Loctite 243 40 2 Washer DIN 125 B5,3 6936 50 1 Magnet flywheel, complete 021.44/2 7195 60 1 Washer 161 A6 7196 70 1 Hexagon head nut DIN 985 M16x1,5 6939 Md=140-150 Nm 80 1 Mounting sheet 374 A4 7197 90 8 Hexagon head screw DIN 933 M5x12 7198 Not on sketch 100 8 Washer DIN 125 B5,3 6936 Not on sketch 110 1 E-Box 021.44/6 5889 130 2 Cylinder screw DIN 912 M6x20 2292 Not on sketch 140 4 Washer DIN 125 B6,4 6916 Not on sketch 150 2 Hexagon head nut DIN 985 N6 5572 Not on sketch 160 1 Ignition coil 021.44/3 7053 Not on sketch 170 1 Holding sheet 374 A5 5883 180 1 Holding sheet 374 A6 5884 190 2 Hexagon head nut DIN 985 M6 5572 Not on sketch 200 2 Washer DIN 125 B6,4 6916 Not on sketch 210 2 Rubber grommet 034.34 6806 220 6 Shrink tube 062.30/7/70 3092 230 3 Spark plug 023.29 5606 232 1 Spark plug lead, short* 7055 234 1 Spark plug lead, middle* 7054 236 1 Spark plug lead, long* 6374 238 1 Spark plug lead set* 7056 240 2 Ignition cable holder 026.55 6937 250 1 Dual cable clip 026.42 7199 Do not use 260 1 Flat plug casing 026.47 5984 270 3 Flat plug male spade DIN 46343 6,3x1 7200 280 1 Flat plug female spade DIN 46343 6,3x2,5 7201 320 1 VAPE R82 DC regulator 14V 029.8 5338 330 1 Ignition Cable Holder Mount Plate 6924 Not on sketch 340 1 M6xM12xM10 Vinyl bushing 6944 Not on sketch 350 1 5mmx0.80x20mm Machine Screw 6930 Not on sketch

Form 17696

Fuel injection horizontal 3701

Fig. No. Quantity Designation Part No. Neoteric Part No Remark note 10 3 Carb socket 377 EA3 7202 Not named at sketch 20 3 Reed valve assembly 058.9 7203 Not named at sketch 30 6 Gasket 327 A3 5463 Not named at sketch 40 6 Cylinder screw DIN 912 M6x65 7204 Not named at sketch 50 6 Cylinder screw DIN 912 M6x30 2289 Not named at sketch 70 12 Washer DIN 125 B6,4 6916 Not named at sketch 80 3 Rubber carburetor flange 327 A2 6568 Not named at sketch 90 6 Cylinder screw DIN 6912

M8x20 6932 Loctite 242

Not named at sketch 100 6 Washer DIN 125 B8,4 6162 Not named at sketch 110 1 Throttle manifold 377 EA1U 6182 120 1 Ground cable 277 EA7U 6454 Not named at sketch 125 1 Hose clamp 063.22 6929 Not named at sketch 130 1 Cable harness 377 EA4U 6210* 132 1 Socket for 0-compensation 277 EA24U 7205 Not named at sketch 135 1 Shrink tube 062.30/7/80 3092 Not named at sketch 140 1 Hose clamp 063.20 6915 Not named at sketch 150 1 Cylinder screw DIN 912 M6x12 2469 Not named at sketch 160 1 Washer DIN 125 B6,4 6916 Not named at sketch 170 5 Cable clip 026.40 7206 Not named at sketch 180 3 Protective plug 083.8 7207 190 1 Rubber socket 083.18 7208 Not named at sketch

Form 17697

Hirth HT6 Air Box Assembly

Form 16621 rev3

Fig. No. Qty Designation Neoteric Part #

Remark

1 3 Rivet 2156 2 1 Fiberglass Air Box 5652 3 3 Air Filter 6622 Includes item 4 4 10 Rivet 2058 5 3 Large Washer 2516 6 3 Small Washer 2352 7 1 Air Collector 6913 8 3 Hose Clamp 2201 - - Polyurethane Sealant 2378 Not Shown - - Sealed Air Box Assembly 6703 Includes item 1 - 8 as shown above

*Entered Service in Late 2010 - Current - Unsealed Air Box (Old Style) 5653 Includes item 1, 2, 3, 4, 6, 7

*Used on Craft Produce Before Late 2010

Fuel System

Form 17698

Fig. No. Qty. Designation Part. No. Neoteric Part No. 200 1 Fuel pump 070.9 5266 210 1 Micro fuel filter 067.4 5733 220 1 Fuel filter 067.3 5372 230 1 Fuel line 062.34/60 6335 240 1 Fuel line 062.35/60 6334 250 1 Clamp 063.21 5993 60 3 Clamp 063.23 2203 270 1 Fuel pump holder 063.28 6636 280 1 Cap 083.9 7209

Start Device 3701

Fig. No. Quant. No.

Designation Part. No. Neoteric Part No

Remark note

10 1 Electric starter 028.14 6498 20 2 Cylinder screw 275 L1 2348 30 2 Serrated lock washer 053.8/8 5995

Form 17699

Cylinder 3701

Fig. No.

Quant. No.

Designation Part. No. Neoteric Part No Remark note

10 3 Cylinder 352 A1 6090 20 3 Cylinder base gasket 322 A4 5545 30 12 Hexagon head nut DIN 934 M8 6233 40 12 Washer 322 A5 6234 50 3 Piston set 014.81 6379 Only allowance group „B“

Contains Pos. 51-55 51 1 Piston 014.81/0 7210 52 1 Piston ring 014.77/1 5452 53 1 Piston ring 014.74/1 5451 54 1 Piston pin 014.77/4 5972 55 2 circlip 014.72/5 6301 60 3 Cylinder head 372 6089 Specify Single Ignition 70 3 O-Ring 056.2/15 5892 80 3 O-Ring 056.2/16 5893 90 18 Cylinder screw DIN 912 M8x65 6408 100 18 Washer DIN 125 B8,4 6407 110 6 Locking screw DIN 910 M10x1 6409 120 6 Sealing ring DIN 7603-

A10x14x1 6410

Form 17759

Exhaust System 3701 (378C)

Form 17760

Fig. No. Qty. Designation Part. No. Neoteric Part No. Remark note 10 1 Outlet Manifold 378C2U Right 5601 20 3 Outlet gasket 378 A11 5914 30 12 Cylinder Screw DIN 912 M8x20 6932 40 4 Exhaust Spring 054.1 5421

Form 707