company founded 1971 1971 1 headquarters rugby warwickshire united kingdom products high performance racing engines website www.engdev.com judd is a name brand of engines produced by engine developments ltd. a company founded in 1971 by john judd and jack brabham in rugby warwickshire england . engine developments was intended to build engines for brabham s racing efforts and became one of the first firms authorised by cosworth to maintain and rebuild its dfv engines but has since expanded into various areas of motorsport . judd has provided engines for many major series including formula one and other smaller formula series sports car racing and touring car racing . they have been associated with manufacturers such as yamaha mg and honda although they have mainly been a privateer engine supplier to customers . contents 1 engine history 1.1 lower formulas 1.1.1 kv 1.2 formula one 1.2.1 cv 1.2.2 ev 1.2.3 gv 1.2.4 yamaha partnership 1.3 sports car racing 1.3.1 gv10 1.3.2 gv4 1.3.3 kv675 1.3.4 gv5 1.3.5 xv675 1.3.6 db 1.4 touring car racing 2 references 3 external links engine history edit lower formulas edit 1989 judd av engine following the departure of jack brabham from engine developments judd was hired by honda to develop an engine for the company s return to formula two in association with ron tauranac s ralt team . after the demise of formula two at the end of the 1984 season judd continued to develop new engines for honda . the first was the judd av a turbocharged v8 engine built for honda s cart campaign . it was first used on the cart circuit midway through the 1986 season fielded by galles racing and driver geoff brabham . it was initially badged as the brabham honda and scored a 4th place finish at the 1986 michigan 500 . in 1987 the engine was used for the first time at the indianapolis 500 . brabham scored second place finishes in 1987 at pocono and road america as well as a third at the season finale at miami . the engine became known for its reliability and superior fuel mileage particularly in the 500 mile races . however it was at a decided horsepower power disadvantage compared to the top engine of the time the ilmor chevrolet . in 1988 truesports with driver bobby rahal took over as the primary team and the honda name was dropped from the powerplant . during the 1988 season rahal took advantage of the engine s reliability in the 500 mile races finishing 4th at indy and 2nd at the michigan 500 . he then scored the first and only indycar victory for the judd engine at the pocono 500 . his ten top 10 finishes led to an impressive 3rd place finish in the season points standings . judd continued to build upgrades to the av into the early 1990s even after honda had stopped badging the engines . when honda moved into the new formula 3000 series judd again developed the company s engine . based on the architecture of the av the new bv v8 was a naturally aspirated variant and would eventually form the basis for the judd cv formula one engine . kv edit after the company s departure from formula one judd returned to formula 3000 in 1995 with the development of the 3 litre kv v8 engine . judd built the engines that every formula 3000 team used although zytek was tasked with maintaining the over 80 engines after they were built . although judd stopped production of the kv and the formula 3000 series ended in 2004 zytek later used the engines as a basis for the a1 grand prix units in 2005 . formula one edit in 1988 in conjunction with march engineering judd made the move into the recently reintroduced normally aspirated variant of formula one which would completely replace turbocharged cars in 1989 . by using the existing bv v8 as the starting point for their new f1 engine judd saved cost while at the same time producing a customer engine that could compete on track and in the marketplace with the ford cosworth v8s that were standard equipment for the mostly smaller teams competing to the new rules . cv edit the first formula one engine developed by judd the cv was built to the 3.5 litre engine formula for naturally aspirated engines . the engine shared many design features with the judd bv engine but was expanded to 3.5 litres . march engineering were the first team who signed to use the judd cv . reigning world constructors champion williams was later forced also to turn to judd after they lost their supply of honda engines for 1988 . in addition ligier also bought cvs for use in the 1988 season . judd powered cars finished in podium positions four times during their debut season with williams lead driver nigel mansell scoring judd s first podium when he finished second at the 1988 british grand prix . during the 1988 season the judd v8 was commonly the fastest of the non turbo engines and the marches of ivan capelli and maur cio gugelmin regularly recorded higher speeds through the speed trap than the cosworth dfr and dfz powered cars with capelli recording the fastest atmo speed trap of the season when he hit 312 km h 194 mph during qualifying for the german grand prix at hockenheim though this was still considerably slower than the turbo powered mclaren honda s which were timed at 333 km h 207 mph . at the 1988 japanese grand prix capelli s judd powered march 881 became the first naturally aspirated car to lead a lap of a grand prix since 1983 when he briefly passed the mclaren of two time world drivers champion alain prost for the lead on lap 16 of the 51 lap race . for the 1989 season judd developed the all new narrow angle judd ev with a more compact 76 degree vee angle rather than the more conventional 90 degrees of the judd av bv cv and the cosworth dfv series . construction of the cv continued as a cheaper alternative for smaller teams however . team lotus and eurobrun were the only cv customers with lotus finishing sixth in the constructors championship . eurobrun was originally the only team to continue with the cv unit into 1990 but life eventually bought cv units to replace their failed in house design . ev edit the previous judd cv was designed with a conventional 90 degree engine block . following the 1988 season it was decided that a narrower vee angle would be adopted to give a more compact engine ; the original intent was a 75 degree vee but limitations in judd s cnc equipment it could only work in even degree increments meant that 76 degrees was used instead . march engineering upgraded their 1988 cv unit to an ev in 1989 while brabham was also supplied with the new engines . brabham and march each scored one podium with the ev engine . both teams continued with the ev in 1990 although march engineering was renamed leyton house racing . leyton house took the engine s only podium of the season a second place at the french grand prix . for 1991 team lotus was the only team to use the older ev . gv edit in the normally aspirated 3.5 litre formula ten and twelve cylinder engines had proved to be more powerful than v8s . this prompted judd to replace the cv and ev v8s with an all new engine in 1991 for the bms scuderia italia team . the new 72 degree angle v10 engine would carry the gv name . the engine was powerful helping the team to a podium finish in the san marino grand prix . judd s agreement with scuderia italia ended following the 1991 season leaving the gvs to be used by the brabham team and newcomers andrea moda formula in 1992 . neither team scored a point all season and judd engines pulled out of formula one . yamaha partnership edit 1993 yamaha ox10a engine a variant of the judd gv engine . following judd s withdrawal from formula one in 1992 john judd turned to yamaha to continue production of his engines . using the judd gv v10 as a base yamaha developed an all new cylinder head and branded the motor as the ox10 for use by tyrrell racing in 1993 . once again tyrrell were unable to score any points all season . an improved ox10b for 1994 boosted tyrrell s performance as the team scored a podium and finished sixth in the constructor s championship . 1997 yamaha ox11c engine a variant of the judd jv engine . rule changes in 1995 saw the ox10c known by judd as the hv reduced to 3 litres although the architecture of the engine was generally the same . tyrrell s performance fell off again however as the team scored five points and finished eighth in the championship . 1996 saw the same points total from tyrrell although the new yamaha ox11 judd jv engine was an all new design . after 1996 tyrrell switched to using ford branded engines . an updated c spec version of the ox11 was used by arrows in 1997 . featuring a new bottom end with changes consisting of a revised sump crankshaft oil pump and water pump ; the ox11c had an extremely low center of gravity and a dry weight of 105 kg vs the renault rs09 s 121 kg but was underpowered 708 bhp vs the rs09 s 755 bhp and most of all unreliable . consequently a d spec was introduced for the 4th race at imola with significant improvements in the airflow management of the combustion chamber area which permitted the ox11d to gain 20 hp which along with superior bridgestone tyres propelled damon hill to a second place at the hungaroring the 11th race of a year that otherwise was pretty lacklustre with pedro diniz s 5th place at the n rburgring as a last high point before yamaha consequently pulled the plug on the failing project . sports car racing edit gv10 edit in 1991 the world sportscar championship introduced an engine formula nearly identical to formula one . this was an attempt to decrease cost by allowing sportscar teams to purchase formula one engines while at the same time encouraging major sportscar manufacturers to enter formula one . this allowed for judd to offer their gv v10 to customers following modifications to meet the endurance requirements necessary in the world sportscar championship . as financial troubles hit other teams the judd v10 became one of the few privately funded engines for the top c1 class . mazda was forced to turn to judd to replace their outlawed rotary engines although the gv10s would be rebadged as mazda mv10s . euro racing also purchased gv10s for their lola t92 10s . mazda finished third in the team s championship while euro racing took fifth . the world sportscar championship was cancelled in 1993 quickly ending judd s first brief involvement in sports car racing . gv4 edit after engine involvement with yamaha in formula one judd returned once again to sports car racing . believing that a large naturally aspirated engine would be fitting for use as a customer supply in the sports racing world cup judd resurrected the gv10 from a few years earlier . expanded to 4 litres and upgraded with new technology the new gv4 became a favorite choice for teams not running the dominant ferrari 333 sp eventually winning the championship with racing for holland in 2002 and 2003 . in 2000 a doran ferrari 333 sp judd hybrid appeared the performance of the judd engine being deemed superior to that of the six year old