BRM P25: Difference between revisions
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{{Short description|Formula One racing car}} |
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{{More citations needed|date=February 2019}}{{Infobox racing car |
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| Car_name = BRM Type 25 |
| Car_name = BRM Type 25 |
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| Image = [[File:BRM P25 at Silverstone Classic 2011.jpg|260px]] |
| Image = [[File:BRM P25 at Silverstone Classic 2011.jpg|260px]] |
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| Category = [[Formula One]] |
| Category = [[Formula One]] |
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| Constructor=[[British Racing Motors]] |
| Constructor=[[British Racing Motors]] |
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| Designer=[[ |
| Designer=[[Stewart Tresilian]]<br>[[Tony Rudd]] |
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| Team = [[Owen Racing Organisation]] |
| Team = [[Owen Racing Organisation]] |
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| Predecessor = [[BRM P30]] |
| Predecessor = [[BRM P30]] |
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| Successor = [[BRM P48]] |
| Successor = [[BRM P48]] |
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| Drivers = {{flagicon|UK}} [[Mike Hawthorn]]<br />{{flagicon|UK}} [[Tony Brooks (racing driver)|Tony Brooks]]<br />{{flagicon|FRA}} [[Jean Behra]]<br />{{flagicon|USA}} [[Harry Schell]] <br />{{flagicon|SWE}} [[Joakim Bonnier]] <br />{{flagicon|UK}} [[Graham Hill]] |
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| Technical ref = <ref name=tech>{{cite book|title= B.R.M. The Saga of British Racing Motors: Volume 1 – Front Engined Cars 1945–1960 |last1= Nye |first1= Doug |authorlink1= Doug Nye |last2= Rudd |first2= Tony |authorlink2= Tony Rudd |year= 1994 |publisher= MRP Publishing Ltd |location= Croydon, England |isbn= 0-947981-37-3 |pages= 432}}</ref> |
| Technical ref = <ref name=tech>{{cite book|title= B.R.M. The Saga of British Racing Motors: Volume 1 – Front Engined Cars 1945–1960 |last1= Nye |first1= Doug |authorlink1= Doug Nye |last2= Rudd |first2= Tony |authorlink2= Tony Rudd |year= 1994 |publisher= MRP Publishing Ltd |location= Croydon, England |isbn= 0-947981-37-3 |pages= 432}}</ref> |
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| Chassis = [[Steel]] box-section [[ladder chassis|ladder]]. |
| Chassis = [[Steel]] box-section [[ladder chassis|ladder]]. |
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| Engine name = [[British Racing Motors|BRM 25]] |
| Engine name = [[British Racing Motors|BRM 25]] |
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| Capacity = {{convert|2491|cc|cuin|1|abbr=on}} |
| Capacity = {{convert|2491|cc|cuin|1|abbr=on}} |
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| Configuration = [[Inline-four engine| |
| Configuration = [[Inline-four engine|Inline-four]], |
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| Turbo/NA = [[Normally aspirated engine| |
| Turbo/NA = [[Normally aspirated engine|Normally aspirated]], |
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| Engine position = [[FM layout|front-mounted]]. |
| Engine position = [[FM layout|front-mounted]]. |
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| Gearbox name = [[British Racing Motors|BRM]] |
| Gearbox name = [[British Racing Motors|BRM]] |
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| Fastest_laps = 1 |
| Fastest_laps = 1 |
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}} |
}} |
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The '''BRM P25''' was a [[Formula One]] racing car raced from |
The '''BRM P25''' was a [[Formula One]] racing car raced from 1956 to 1960 and the second car produced by the [[British Racing Motors]] consortium. After the failure of the complex [[BRM P15|BRM V16]], the P25's design emphasized simplicity. The car was fitted with a 2.5-litre straight-4 engine, producing some 275 horsepower. The P25 would be the foundation of BRM's successes in the late 1950s and early 1960s. |
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==Development== |
==Development== |
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With BRM in financial trouble after the V16 experiment, [[Alfred Owen]] purchased the team and set work on a new car. While the car was being developed, BRM ran a privateer [[Maserati 250F]] through the [[1954 Formula One season|1954]] and [[1955 Formula One season|1955]] seasons. |
With BRM in financial trouble after the V16 experiment, [[Alfred Owen]] purchased the team and set work on a new car. While the car was being developed, BRM ran a privateer [[Maserati 250F]] through the [[1954 Formula One season|1954]] and [[1955 Formula One season|1955]] seasons. [[Stewart Tresilian]] and [[Tony Rudd]]<ref>{{cite web|title=Tony Rudd|url= http://www.motorsportmagazine.com/archive/article/october-2003/17/architect-brms-formula |website=[[Motor Sport (magazine)|Motor Sport]] magazine archive|date=October 2003|page=17|accessdate=24 December 2015}}</ref> designed an entirely new twin-cam 2.5-litre four-cylinder for the P25. The engine's large bore allowed for larger valves to be fitted. In an exception to keeping with BRM's all-British supply policy, two Weber carburetors were fitted. The engine was mounted to a simple ladder frame steel chassis, with a centre tub [[monocoque]] section.<ref>{{cite web |title=The Killeen Cars |url=http://tardis.dl.ac.uk/Mercia/killeen_book/node3.html |website=tardis.dl.ac.uk |archiveurl= https://web.archive.org/web/20190508142810/http://tardis.dl.ac.uk/Mercia/killeen_book/node3.html |archivedate=2019-05-08 |url-status=live}}</ref> The P25 used Lockheed [[disc brakes]] at the front wheels, which would later be replaced by Dunlop discs. Uniquely, a single brake disc was fitted to the gearbox at the rear. |
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==Racing record== |
==Racing record== |
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The P25 began racing in non-championship events in September 1955. The car's horsepower proved to be its strong suit, but its handling and reliability problems were quickly revealed. Three Type 25s were entered for [[Tony Brooks]], [[Mike Hawthorn]], and [[Ron Flockhart (racing driver)|Ron Flockhart]] in the model's world championship debut, the [[1956 British Grand Prix]]. However, none finished. Reliability woes would plague the team during the P25's early development. The large valves were prone to letting debris into the engine, and the single rear disc often failed. A P25 would not finish a Grand Prix until [[Harry Schell|Harry Schell's]] fifth place in the [[1958 Monaco Grand Prix]]. Schell and [[Jean Behra]] would finish 2nd and 3rd in that year's [[1958 Dutch Grand Prix|Dutch Grand Prix]]. They were the first podiums for BRM. Four more points finishes from Behra, Schell, and new-hire [[Joakim Bonnier]] placed BRM 4th in the inaugural [[List of Formula One World Constructors' Champions|Constructor's Championship]]. Bonnier took his and BRM's first victory at the [[1959 Dutch Grand Prix]]. With the P25 running reliably, BRM was able to secure 3rd in the Constructor's Championship. Just as the P25 became reliable, [[Cooper Car Company|Cooper]] started the rear-engine revolution and quickly rendered front engined cars such as the P25 obsolete. BRM began work on a rear engined model, the [[BRM P48|P48]] not long after Bonnier's victory. The P48 would replace the P25 midway through the [[1960 Formula One season|1960 season]]. |
The P25 began racing in non-championship events in September 1955. The car's horsepower proved to be its strong suit, but its handling and reliability problems were quickly revealed. Three Type 25s were entered for [[Tony Brooks (racing driver)|Tony Brooks]], [[Mike Hawthorn]], and [[Ron Flockhart (racing driver)|Ron Flockhart]] in the model's world championship debut, the [[1956 British Grand Prix]]. However, none finished. Reliability woes would plague the team during the P25's early development. The large valves were prone to letting debris into the engine, and the single rear disc often failed. A P25 would not finish a Grand Prix until [[Harry Schell|Harry Schell's]] fifth place in the [[1958 Monaco Grand Prix]]. Schell and [[Jean Behra]] would finish 2nd and 3rd in that year's [[1958 Dutch Grand Prix|Dutch Grand Prix]]. They were the first podiums for BRM. Four more points finishes from Behra, Schell, and new-hire [[Joakim Bonnier]] placed BRM 4th in the inaugural [[List of Formula One World Constructors' Champions|Constructor's Championship]]. Bonnier took his and BRM's first victory at the [[1959 Dutch Grand Prix]]. With the P25 running reliably, BRM was able to secure 3rd in the Constructor's Championship. Just as the P25 became reliable, [[Cooper Car Company|Cooper]] started the rear-engine revolution and quickly rendered front engined cars such as the P25 obsolete. BRM began work on a rear engined model, the [[BRM P48|P48]] not long after Bonnier's victory. The P48 would replace the P25 midway through the [[1960 Formula One season|1960 season]]. |
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In addition to the factory entries, the [[British Racing Partnership]] ran a P25 for [[Stirling Moss]] and [[Hans Herrmann]] in 1959. Moss scored a 2nd place in the [[1959 British Grand Prix|British Grand Prix]] before the car was destroyed in a massive accident during the [[1959 German Grand Prix|German Grand Prix]] with Hermann at the wheel. |
In addition to the factory entries, the [[British Racing Partnership]] ran a P25 for [[Stirling Moss]] and [[Hans Herrmann]] in 1959. Moss scored a 2nd place in the [[1959 British Grand Prix|British Grand Prix]] before the car was destroyed in a massive accident during the [[1959 German Grand Prix|German Grand Prix]] with Hermann at the wheel. |
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|rowspan="4"| ''n/a''* |
|rowspan="4"| ''n/a''* |
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|align="left"| |
|align="left"| [[Mike Hawthorn]] |
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|style="background:#ffffff;"| DNS |
|style="background:#ffffff;"| DNS |
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|align="left"| |
|align="left"| [[Tony Brooks (racing driver)|Tony Brooks]] |
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|style="background:#ffffff;"| DNS |
|style="background:#ffffff;"| DNS |
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|align="left"| |
|align="left"| [[Ron Flockhart (racing driver)|Ron Flockhart]] |
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|rowspan="6"| ''n/a''* |
|rowspan="6"| ''n/a''* |
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|align="left"| |
|align="left"| [[Ron Flockhart (racing driver)|Ron Flockhart]] |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|align="left"| |
|align="left"| [[Roy Salvadori]] |
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|style="background:#FFCFCF;"| DNQ |
|style="background:#FFCFCF;"| DNQ |
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|align="left"| |
|align="left"| [[Herbert MacKay-Fraser]] |
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|align="left"| |
|align="left"| [[Jack Fairman]] |
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|align="left"| |
|align="left"| [[Les Leston]] |
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|rowspan="6" |'''4th''' |
|rowspan="6" |'''4th''' |
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|align="left"| |
|align="left"| [[Harry Schell]] |
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|style="background:#DFFFDF;"| 5 |
|style="background:#DFFFDF;"| 5 |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|align="left"| |
|align="left"| [[Jean Behra]] |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|align="left"| |
|align="left"| [[Maurice Trintignant]] |
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|align="left"| |
|align="left"| [[Joakim Bonnier]] |
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|style="background:#DFFFDF;"| 4 |
|style="background:#DFFFDF;"| 4 |
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|align="left"| |
|align="left"| [[Ron Flockhart (racing driver)|Ron Flockhart]] |
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|rowspan="6" style="background:#FFDF9F;"|'''3rd''' |
|rowspan="6" style="background:#FFDF9F;"|'''3rd''' |
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|align="left"| |
|align="left"| [[Harry Schell]] |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|align="left"| |
|align="left"| [[Ron Flockhart (racing driver)|Ron Flockhart]] |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|align="left"| |
|align="left"| [[Joakim Bonnier]] |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|rowspan="2"| [[British Racing Partnership]] |
|rowspan="2"| [[British Racing Partnership]] |
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|align="left"| |
|align="left"| [[Stirling Moss]] |
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|align="left"| |
|align="left"| [[Hans Herrmann]] |
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|rowspan="4" |'''4th''' |
|rowspan="4" |'''4th''' |
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|align="left"| |
|align="left"| [[Graham Hill]] |
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|style="background:#EFCFFF;"| Ret |
|style="background:#EFCFFF;"| Ret |
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|align="left"| |
|align="left"| [[Joakim Bonnier]] |
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|style="background:#CFCFFF;"| 7 |
|style="background:#CFCFFF;"| 7 |
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Latest revision as of 22:43, 8 January 2022
This article needs additional citations for verification. (February 2019) |
Category | Formula One | ||||||||
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Constructor | British Racing Motors | ||||||||
Designer(s) | Stewart Tresilian Tony Rudd | ||||||||
Predecessor | BRM P30 | ||||||||
Successor | BRM P48 | ||||||||
Technical specifications[1] | |||||||||
Chassis | Steel box-section ladder. | ||||||||
Suspension (front) | Porsche-type trailing arms, with Lockheed air struts. | ||||||||
Suspension (rear) | de Dion tube, with Lockheed air struts. | ||||||||
Wheelbase | 90 in (228.6 cm) | ||||||||
Engine | BRM 25 2,491 cc (152.0 cu in) Inline-four, Normally aspirated, front-mounted. | ||||||||
Transmission | BRM 4-speed, transverse shaft. ZF differential. | ||||||||
Weight | 1,521 lb (689.9 kg) (Unladen) | ||||||||
Fuel | Petrol/alcohol mix. | ||||||||
Tyres | Dunlop. | ||||||||
Competition history | |||||||||
Notable entrants | Owen Racing Organisation | ||||||||
Notable drivers | Mike Hawthorn Tony Brooks Jean Behra Harry Schell Joakim Bonnier Graham Hill | ||||||||
Debut | 1956 British Grand Prix | ||||||||
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The BRM P25 was a Formula One racing car raced from 1956 to 1960 and the second car produced by the British Racing Motors consortium. After the failure of the complex BRM V16, the P25's design emphasized simplicity. The car was fitted with a 2.5-litre straight-4 engine, producing some 275 horsepower. The P25 would be the foundation of BRM's successes in the late 1950s and early 1960s.
Development[edit]
With BRM in financial trouble after the V16 experiment, Alfred Owen purchased the team and set work on a new car. While the car was being developed, BRM ran a privateer Maserati 250F through the 1954 and 1955 seasons. Stewart Tresilian and Tony Rudd[2] designed an entirely new twin-cam 2.5-litre four-cylinder for the P25. The engine's large bore allowed for larger valves to be fitted. In an exception to keeping with BRM's all-British supply policy, two Weber carburetors were fitted. The engine was mounted to a simple ladder frame steel chassis, with a centre tub monocoque section.[3] The P25 used Lockheed disc brakes at the front wheels, which would later be replaced by Dunlop discs. Uniquely, a single brake disc was fitted to the gearbox at the rear.
Racing record[edit]
The P25 began racing in non-championship events in September 1955. The car's horsepower proved to be its strong suit, but its handling and reliability problems were quickly revealed. Three Type 25s were entered for Tony Brooks, Mike Hawthorn, and Ron Flockhart in the model's world championship debut, the 1956 British Grand Prix. However, none finished. Reliability woes would plague the team during the P25's early development. The large valves were prone to letting debris into the engine, and the single rear disc often failed. A P25 would not finish a Grand Prix until Harry Schell's fifth place in the 1958 Monaco Grand Prix. Schell and Jean Behra would finish 2nd and 3rd in that year's Dutch Grand Prix. They were the first podiums for BRM. Four more points finishes from Behra, Schell, and new-hire Joakim Bonnier placed BRM 4th in the inaugural Constructor's Championship. Bonnier took his and BRM's first victory at the 1959 Dutch Grand Prix. With the P25 running reliably, BRM was able to secure 3rd in the Constructor's Championship. Just as the P25 became reliable, Cooper started the rear-engine revolution and quickly rendered front engined cars such as the P25 obsolete. BRM began work on a rear engined model, the P48 not long after Bonnier's victory. The P48 would replace the P25 midway through the 1960 season.
In addition to the factory entries, the British Racing Partnership ran a P25 for Stirling Moss and Hans Herrmann in 1959. Moss scored a 2nd place in the British Grand Prix before the car was destroyed in a massive accident during the German Grand Prix with Hermann at the wheel.
Complete Formula One World Championship results[edit]
* The World Constructors' Championship was not awarded before 1958.
** All points scored using the BRM P48
References[edit]
- ^ Nye, Doug; Rudd, Tony (1994). B.R.M. The Saga of British Racing Motors: Volume 1 – Front Engined Cars 1945–1960. Croydon, England: MRP Publishing Ltd. p. 432. ISBN 0-947981-37-3.
- ^ "Tony Rudd". Motor Sport magazine archive. October 2003. p. 17. Retrieved 24 December 2015.
- ^ "The Killeen Cars". tardis.dl.ac.uk. Archived from the original on 2019-05-08.