Honda RA300

{{Short description|Formula One racing car}}

{{More references|date=June 2019}}

{{Use dmy dates|date=May 2017}}

{{Racing car

| Car_name = Honda RA300

| Image = Honda RA300 front-left Honda Collection Hall.jpg

| Image_size = 250px

| Caption = The RA300 of John Surtees on display at the Honda Collection Hall in 2013

| WC_results_only = Y

| Category = Formula One

| Constructor = Honda R&D

| Predecessor = RA273

| Successor = RA301

| Designer = Eric Broadley (Lola Cars)
John Surtees (Honda)
Yoshio Nakamura (Honda)
Shoichi Sano (Honda)

| Team = Honda Racing

| Drivers = {{flagicon|GBR}} John Surtees

| Chassis = Aluminium monocoque

| Front suspension =

| Rear suspension =

| Engine name = Honda RA273E,

| Capacity = 2991cc

| Configuration = V12

| Turbo/NA = naturally aspirated,

| Engine position = mid-engined, longitudinally mounted

| Gearbox name = Honda

| Gears = 5-speed

| Type = manual

| Differential =

| Fuel = BP/Shell

| Tyres = Firestone

| Debut = 1967 Italian Grand Prix

| First_win = 1967 Italian Grand Prix

| Last_win = 1967 Italian Grand Prix

| Last_event = 1968 South African Grand Prix

| Races = 4

| Wins = 1

| Podiums = 1

| Cons_champ = 0

| Drivers_champ = 0

| Poles = 0

| Fastest_laps = 0

}}

The Honda RA300 was a Formula One racing car produced by Honda Racing, and introduced towards the end of the 1967 Formula One season. It retained the same V12 engine as the preceding RA273 car, but the chassis was designed by Lola's Eric Broadley thanks to Honda driver John Surtees' experiences driving a Lola T70 in the Can-Am championship.{{cite web | url = https://automedia.revsinstitute.org/honda-ra300-the-great-one-lap-wonder-of-formula-1 | archive-url = https://web.archive.org/web/20231203150637/https://automedia.revsinstitute.org/honda-ra300-the-great-one-lap-wonder-of-formula-1 | archive-date = 2023-12-03 | first = Wouter | last = Melissen | work = Revs Institute | title = Honda RA300: The great "one-lap wonder" of Formula 1 }} The new chassis was based on a previous Lola Indianapolis 500 car, the T90. Internally, Lola designated the RA300 the T130. This collaboration resulted in the machine quickly being dubbed the "Hondola" by the motorsports press.

File:Honda RA300 engine.jpg

Broadley's chassis was much lighter and sweeter-handling than the in-house RA273. The car initially performed impressively, winning in its first-ever World Championship race, the Italian Grand Prix at Monza. Driver John Surtees took the lead from Jim Clark's Lotus and Jack Brabham's Brabham on the final lap, after Clark ran out of fuel and Brabham ran wide. However, the RA300 flattered to deceive, and this would turn out to be the only lap that the car would lead. It remains the only F1 car ever to take its single victory in its first Grand Prix, and on the only lap it would ever lead.

File:Honda RA300.jpg

Honda continued with the RA300 for the remainder of the 1967 season, Surtees finishing fourth at the final race in Mexico. The car was then raced one last time at the opening race of the 1968 season in South Africa, Surtees finishing eighth, before being superseded by the RA301, a design closely based on the RA300.

File:2006FOS 1967HondaRA300.jpg in 2006.]]

The 48-valve V12 engine first appeared in the RA273 at the 1966 Italian Grand Prix, driven by Richie Ginther. In spite of weighing 740 kg (dry), it was capable of spinning the rear tyres at 100 mph in third gear. With cylinder dimensions of 78.0 x 52.2 mm and a displacement of 2,993.17 cc, a target of 400-440 bhp at 12,000 rpm was quoted. The engine used by Surtees at Monza in 1967 was quoted by Motoring News as developing only 396 bhp, but with improved torque and response. Honda quotes the 1967 RA300 as producing "over 420 PS" (414 bhp) at 11,500rpm.{{Cite web|title=YouTube|url=https://www.youtube.com/watch?v=Tpym8zNcpxU&feature=youtu.be&t=11|access-date=2020-06-16|website=www.youtube.com}} The vehicle weight excess over the 500 kg minimum was more than halved, with Honda quoting a weight of {{cvt|590|kg|lb|0}}{{Citation|title=1967 Honda RA300 F1 Car - 3.0L V12 Engine Sound!|url=https://www.youtube.com/watch?v=Tpym8zNcpxU|language=en|access-date=2020-06-16}} – some sources state {{cvt|610|kg|lb|0}} – whereas the RA273 had been {{cvt|740|kg|lb|0}}, or nearly fifty percent overweight.

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