Honda VFR750R

Honda VFR750R

Manufacturer	Honda
Also called	Honda RC30
Class	Sport bike
Engine	748.00 cc (45.646 cu in) water cooled V4
Bore / stroke	70.0 mm × 48.6 mm (2.76 in × 1.91 in)
Compression ratio	11.0:1
Power	110 hp (82 kW) @ 9,500 rpm[1]
Torque	7.1 kg·m (70 N·m; 51 lbf·ft) @ 7,000 rpm[1]
Transmission	5 speed, chain drive
Suspension	Front: telescopic fork Rear: swingarm
Brakes	Front: dual disc Rear: single disc
Tires	Front: 120/70-17 Rear:170/60-18
Wheelbase	1,410 mm (56 in)
Dimensions	L: 2,045 mm (80.5 in) W: 700 mm (28 in) H: 1,100 mm (43 in)
Weight	180 kg (400 lb)[1] (dry)
Fuel capacity	18 l (4.0 imp gal; 4.8 US gal)
Related	Honda VFR400

The Honda VFR750R, frame designation 'RC30', was a fully faired racing motorcycle created for homologation purposes for the World Superbike Championship by Honda Racing Corporation (HRC). It was first released to the Japanese market in 1987, then the United States in 1990. The final one hundred RC30 machines were made for England in 1990.

Engine

Honda RC30

The 748 cc 16-valve gear driven double overhead camshaft liquid-cooled RC24-derived 90° V4 produced 110 hp (82 kW) at 9,500 rpm.^[1][2] It contained race-inspired components. These included such items as titanium connecting rods that reduced reciprocating weight (50 g or 1.8 oz lighter and eight times the cost) and, gear driven camshafts. The engine firing configuration was very different from the road-going VFR750F from which it was derived with a 360° 'big bang' crank arrangement instead of the smoother 180°. This feature produced a very broad spread of power and, when coupled to the close ratio gearbox which had an extremely high first gear ratio (0 - 82 mph), made the RC30 untouchable in terms of driveability when on the move. Slowing down was made easier with a slipper clutch, and impressive braking capability for the era.

Joey Dunlop coming down Bray Hill, Isle of Man in the 1992 Senior TT race, on his Honda RC30.

While being inspired by the Honda RVF endurance racer (not to be confused with the Honda RVF750 RC45) the VFR750R instead had its engine based on the 1986-7 VFR750F (RC24). The engines are almost identical externally, the only visible differences being in the cylinder heads and the engine side covers. Inside the engine no major parts were identical to the RC24. The clutch, gearbox, crankshaft, oil pump, connecting rods, water pump, pistons, starter clutch, and the entire valvetrain and cylinder heads are specific to the RC30.

It redlined at 12,500 rpm (in comparison to the VFR750F which redlines at 11,000 rpm) and weighed 180 kg (400 lb) dry.^[1]

Suspension and brakes

A Honda VFR750R (RC30) racing on the Isle of Man in 1992

The RC30 front suspension was made by Showa and had wheel and brake pads that had quick-release mountings. The rear wheel carried a brake disc to the inside and a chain sprocket to the outside of a single-sided swingarm (originally patented by ELF of France), and attached with a single castellated nut and cotter pin. It was also equipped with fully adjustable Showa suspension which, as it only had a single seat thus focusing suspension performance, gave superior ride and handling characteristics. The engine and low storage position of the fuel in the fuel tank combined to give a low centre of gravity which aided its handling prowess. Further statements of its hand-built quality were shown in a full stainless steel 4-2-1 exhaust system, alloy fuel tank and hand laid fibreglass bodywork.

The bike was fitted with an 'anti-squat' rear brake linkage that linked the rear caliper to the frame via a rose-jointed linkage through the swingarm (reducing rear suspension displacement under braking).

Motorsport

Fred Merkel won the inaugural Superbike World Championship riders and manufacturers titles, and repeated this feat in 1989.

Robert Dunlop won the 1989 Macau Grand Prix, and Steve Hislop did the same in 1990.

Relatives

The VFR400R (NC30) closely resembles the VFR750R (RC30).

The RC30 was superseded some four years after the last one was built by the Honda RVF750 RC45 in 1994.

References

1. "VFR750R". Motor Roots (in Japanese). Honda. Retrieved 30 September 2012.
2. http://www.visordown.com/reviews/motorcycles/sportsbikes/honda-rc30/review/2611.html

External links

• Official Honda Website VFR750R (RC30) [Japanese]