Honda NR

Honda NR (New Racing) motor bermesin V- empat silinder dibangun pada tahun 1979 untuk mengikuti even balap Grand Prix 500cc Honda NR500 merupakam motor yang pertama kali  menggunakan piston oval. Pada tahun 1980 Honda mengembangkanNR750 untuk mengikuti balap ketahanan di kelas 750cc. Konsep piston oval dikombinasi dengan delapan valve per silinder yang menghasilkan daya lebih karena campuran bahan bakar & udara lebih bertenaga. Pada tahun 1992 Honda memproduksi versi jalan raya NR750, dengan sudut V 90 derajat, sebanyak 300 unit. NR750 menjadi motor dengan biaya produksi paling mahal pada saat itu, motor keluaran Honda ini dijual dengan harga $ 50.000 dan sekarang menjadi collector item.

Pengembangan

Asal-usul seri ‘NR’ berawal dari niat kembalinya Honda di balapan Grand Prix pada akhir tahun 1970, Honda ingin merasakan kesuksesan Honda di ajang GP pada tahun 1960. Selama periode 1970-1980, Grand Prix didominasi oleh motor 2-tak  yang memiliki mesin yang dapat dengan mudah mencapai output lebih tinggi daripada mesin 4-tak. Honda pada saat itu tidak begitu suka dengan mesin 2-tak, dan ingin melawan kompetitornya di ajang GP yang didominasi dengan mesin 2-tak dengan menggunakan mesin 4-tak.

Untuk mencapai tujuan ini Honda ingin memakai mesin diatas 4 silinder untuk menghasilkan tenaga lebih. Namun, aturan Grand Prix  pada saat itu hanya memperbolehkan maksimum 4-silinder. Engineer Honda memiliki solusi yang sangat inovatif membangun ‘V8’ mesin dalam bentuk 4-silinder. Hal ini dicapai dengan merancang sebuah piston oval yang memungkinkan total 8 klep/valve per silinder, dengan menggunakan dua stang  piston untuk masing-masing piston. Konfigurasi seperti itu menyebabkan kerumitan yang hampir belum pernah terjadi sebelumnya dalam hal desain mesin, dengan 32 klep dan delapanstang piston dimasukkan ke dalam dimensi mesin empat silinder sepeda motor biasa.

Pengembangan dan pengujian mesin baru terbukti, Honda akhirnya berhasil memenuhi kriteria kinerja asli untuk mesin. Versi 500cc mammpu menghasilkan tenaga sekitar 130 bhp di 20.000 rpm. Namun, ini kurang memberikan kesuksesan di ajang balap, akhirnya Honda membangun mesin NS500 2-tak.

Konsep piston oval dilanjutkan di ajang balap endurance, NR750 dipersiapkan untuk mengikuti ajang ini di tahun 1980. Akhirnya Honda menerapkan teknologi piston oval ke motor massal, dan diproduksi secara terbatas, Honda melabelkan motor piston oval mereka dengan nama ‘NR’. Salah satu sepeda motor jalan paling mahal yang pernah dijual, sejumlah model NR dijual pada tahun 1992 dengan versi 750cc dan menghasilkan tenaga sebesar 125 bhp pada 14.000 rpm. pada jamannya, motor ini merupakan motor yang sangat cepat.

Pada saat ini, Honda NR menjadi barang buruan para kolektor motor, harga bekas motor ini pada tahun 2009 dibandrol £40,000, kalo di kurs ke Rupiah menjadi Rp. 472.860.204,- ,belum termasuk biaya pajak, ongkir dari Inggris ke Indonesia (COD Only) 😀

Kira-kira orang Indonesia ada yang punya Honda NR apa ngga yaaa???

 

 

Specifications

Item		Specifications
Dimensions:	Overall length	2,150mm (84.6 in.)
	Overall width	700mm (27.6 in.)
	Overall height	1,090mm (42.9in.)
	Wheelbase	1,435mm (56.5 in.)
	Seat height	785mm (30.9 in.)
	Footpeg height	360mm (14.2 in.)
	Ground clearance	130mm (5.1 in.)
	Dry weight	223.0kg (491.6 lb.)
	Curb weight	244.0kg (537.9 lb.)
	Maximum weight capacity	115.0kg (253.5 lb.)
Frame:	Frame type	Triple-square section twin-tube
	Front suspension	Telescopic; inverted type
	Front wheel travel	120mm (4.7 in.)
	Rear suspension	Vertically-asymmetric Pro-Arm swing arm with Pro-Link
	Rear wheel travel	120mm (4.7 in.)
	Rear damper	Nitrogen gas-filled damper with reserve tank
	Front wheel	16×3.5 in. magnesium alloy
	Rear wheel size	17×5.5 in. magnesium alloy
	Front tire size	130/70-ZR16 (Michelin TX11 radial)
	Front tire pressure	270 kPa (2.70 kg/cm²; 39 psi.)
	Rear tire size	180/55-ZR17 (Michelin TX23 radial)
	Rear tire pressure	290 kPa (2.90 kg/cm²; 42 psi.)
	Front brakes	Dual disc; 310mm (12.2 in.) with 4-piston caliper and semi-metallic pads
	Rear brake	Single ventilated disc; 220mm (8.7 in.) with dual-piston caliper and sintered metal pads
	Caster angle	24-deg 30′
	Trail length	88mm (3.5 in.)
	Fuel tank capacity	17.0 liters (3.74 Imp gal., 4.5 U.S. gal.)
Engine:	Bore (Major x Minor axis)	101.2 x 50.6mm (3.98 x 1.99 in.) (Equivalent to 75.3mm (2.96 in.) when calculated as a circle)
	Stroke	42.0mm (1.65 in.)
	Displacement	747.7 cm³ (45.6 cu in.)
	Compression ratio	11.7 : 1
	Valve train	Cam gear-driven DOHC; 8 valves per cylinder
	Intake valve opens (@ 1mm (0.04 in.) lift)	20-deg. BTDC
	Intake valve closes (@ 1mm (0.04 in.) lift)	50-deg. ABDC
	Exhaust valve opens (@ 1mm (0.04 in.) lift)	46-deg. BBDC
	Exhaust valve closes (@ (0.04 in.) 1mm lift)	16-deg. ATDC
	Lubrication system	Forced pressure and wet sump with oil cooler
	Oil pump type	Trockoid
	Cooling system	Liquid cooled
	Air filtration	Oiled paper filter
	Crankshaft type	Unit-type; 5 main journals; [360-deg.]2
	Engine weight	80.5kg (177.5 lb.)
	Firing order	#1 @ 270 deg.; #2 @ 90 deg.; #3 @ 270 deg.; #4
	Cylinder arrangement	90-deg. V4
	Cylinder numbering
Fuel system:	Throttle body	PGM-FI (Programmed Fuel Injection)
	Throttle bore	30mm (1.2 in.) x 8
Drive train:	Clutch system	Multi-plate, wet
	Clutch operation system	Hydraulic
	Transmission	6 speeds
	Primary reduction	1.937 (62/32)
	Final reduction (sprockets)	2.500 (40/16)
	Drive chain slack	20-30mm (3/4~1-1/8 in.)
	Drive chain size/links	525/108
	Gear ratio, 1st	2.666 (40/15)
	Gear ratio, 2nd	2.125 (34/16)
	Gear ratio, 3rd	1.777 (32/18)
	Gear ratio, 4th	1.545 (34/22)
	Gear ratio, 5th	1.381 (29/21)
	Gear ratio, 6th	1.240 (31/25)
	Gearshift pattern	Left foot operated return system: 1—N—2—3—4—5—6
Electrical:	Ignition system	Computer-controlled digital transistorized with electronic advance
	Starting system	Electric starter
	Charging system	Triple phase output alternator
	Regulator/rectifier type	SCR shorted/triple phase full-wave rectification
	Lighting system	Battery (Yuasa YTX12-BS)
Lubrication:	Engine oil capacity at draining	3.6 liters (3.17 Imp. qt., 3.78 U.S. qt.)
	Engine oil capacity at disassembly	4.7 liters (4.14 Imp. qt., 4.94 U.S. qt.)
	Engine oil capacity at oil filter change	3.9 liters (3.44 Imp. qt., 4.10 U.S. qt.)
	Recommended engine oil	Use Honda 4-Stroke Oil or equivalent with the Honda UC oil at the prescribed ratio
	Recommended engine oil viscosity	SAE 10W-40; API Service Classification: SE, SF or SG
	Recommended oil additive	Honda UC Oil
	Engine oil/UC oil mixing ratio	1 liter : 50cc
	Oil pressure at oil pressure switch	600 kPa (6.0 kg/cm², 228 psi) @ 6,000 rpm (80 deg.C, 176 deg.F)
PGM-FI (Programmed Fuel Injection):	Starter valve vacuum difference	20mmHg [(0.8inHg)]2
	Base throttle valve (for synchronization)	No. 3
	Idle speed (except Swiss and Austrian models)	1,300 +/- 100 rpm
	Idle speed (Swiss and Austrian models)	1,500 +/- 100 rpm
	Throttle grip free play	2-6mm (0.08-0.24 in.)
	Ta (air temperature) sensor resistance (@ 20 deg.C/68 deg.F)	1-4 kOhms
	Tw (water temperature) sensor resistance (@ fan motor operating temperature)	150-400 kOhms
	Cam pulse generator resistance (@ 20 deg.C/68 deg.F)	400-600 kOhms
	Fuel injector resistance (@ 20 deg.C/68 deg.F)	9-14 kOhms
	Bypass solenoid valve resistance (@ 20 deg.C/68 deg.F)	28-32 kOhms
	Cam pulse generator peak voltage	0.7v or more
	Crank pulse generator peak voltage	0.7v or more
	Manifold absolute pressure @ idle	140-180 mmHg
	Fuel pressure @ idle	255 kPa (2.55 kg/cm²; 36 psi)
	Fuel pump flow	150 cm³ (5.26 Imp. oz.; 5.07 U.S. oz.) or more/10 seconds
	Secondary air supply system	(Swiss and Austrian models only)
	Air suction valve vacuum pressure	380mmHg
Clutch system:	Clutch lever free play	10-20mm (0.4-0.8 in.)
	Recommended clutch fluid	DOT 4 brake fluid
	Clutch master cylinder I.D.	14.000-14.043mm (0.5512-0.5529 in.) (~9/16″)
	Clutch disc thickness	3.72-3.88mm (0.147-0.153 in.)
	Clutch disc service limit	3.6mm (0.14 in.)
	Clutch plate warpage limit	0.30mm (0.012 in.)
Cooling system:	Coolant capacity (radiator & engine)	2.9 liters (2.55 Imp. qt., 3.05 U.S. qt.)
	Coolant capacity (reserve tank)	0.34 liter (0.30 Imp. qt., 0.36 U.S. qt.)
	Radiator cap relief pressure	110-140 kPa (1.10-1.40 kg/cm², 16-20 psi)
	Thermostat begins to open	80-84 deg.C (176-183 deg.F)
	Thermostat fully opens	95 deg.C (203 deg.F)
	Thermostat valve lift	8.0mm (0.23 in.) min.
Front suspension:	Fork spring free length	251.7mm (9.91 in.)
	Fork spring direction	Taper-wound coil facing up
	Recommended fork oil	Fork fluid [(5wt)]2
	Fork oil level	56mm (2.2 in.)
	Fork oil capacity	580 cm³ (20.36 Imp. oz; 19.62 U.S. oz)
	Steering bearing pre-load	9-14 Nm (0.9-1.4kg; 2.0-3.1 lb.)
Rear suspension:	Shock spring free length	160.0mm (6.30 in.)
	Shock spring installed length	147.6mm (5.81 in.)
	Nitrogen gas pressure	980 kPa (10.0 kg/cm²; 142 psi)
Brakes:	Brake fluid type	DOT 4
	Front brake disc thickness	5.0mm (0.20 in.)
	Front brake master cylinder I.D.	14.000-14.043mm (0.5512-0.5529 in.) (~9/16″)
	Front brake caliper cylinder I.D. (upper)	27.000-27.050mm (1.0630-1.0650 in.)
	Front brake caliper cylinder I.D. (lower)	30.230-30.280mm (1.1902-1.1921 in.)
	Rear brake disc thickness	9.0mm (0.35 in.)
	Rear brake master cylinder I.D.	12.700-12.743mm (0.5000-0.5017 in.) (~1/2″)
	Rear brake caliper cylinder I.D.	25.400-25.450mm (1.0000-1.0020 in.)
Battery/Charging system:	Reg/rec regulated voltage	12.6-15.0v @ 3,000rpm
	Battery capacity	12v-10Ah
	Battery charging rate (normal)	1.2A/5-15 hr.
	Battery charging rate (quick)	5.0A/1 hr.
	Battery voltage	13.1v
	Front brake master cylinder I.D.	14.000mm (0.5512 in.) (9/16″)
	Front brake caliper cylinder I.D. (upper)	32.030mm (1.2610 in.)
	Current leakage	1.5mA maximum
	Alternator/charging coil resistance (@ 20 deg.C/68 deg.F)	0.1-0.5 Ohms
Ignition system:	Spark plug (standard)	NGK ER9EH or ND Y27FER-C
	Spark plug (extended high-speed riding)	NGK ER10EH or ND Y31FER-C
	Spark plug (cold climate/below 5 deg.C/41 deg.F)	NGK ER8EH or ND Y24FER-C
	Spark plug gap	0.6-0.7mm (0.024-0.028 in.)
	Ignition timing “F” mark (except Swiss and Austrian models)	15-deg. BTDC @ 1,300rpm
	Ignition timing “F” mark (Swiss and Austrian models)	10-deg. BTDC @ 1,500rpm
	Advance starts	2,000rpm
	Advance stops	5,000rpm
Lights/Meters/Switches:	Main fuse A	30A
	Main fuse B	55A
	Fuse	30A x 1; 10A x 6
	Headlight (high beam)	12v 60/55w (H4; low beam portion not used)
	Projector headlight (low beam)	12v 55w (H3)
	Position light	12v 5w
	Turn signal lights	12v 21w
	Tail/brake light	12v 5/21w x 2
	License light	12v 5w
	Turn signal indicator	12v 3w x 2
	High beam indicator	12v 1.7w
	Neutral indicator	12v 1.7w
	Side stand indicator	12v 3w
	Oil pressure warning indicator	12v 3w
	Fuel reserve warning indicator	12v 3w
	PGM-FI warning indicator	12v 1.7w
	Instrument light	12v 1.7w x 5
	LCD light	12v 8w
Starting system:	Starter motor brush length	12.0-13.0mm (0.47-0.51 in.)

sumber : wikipedia dan NR750