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5 Valve heads (NAC)



A little late with these notes, but did a little research, not claiming
to have produced a definitive history, rather a few highlights. I did
not confirm the validity of the information on the web sites listed; hey
it's just for grins.

197x: Otto Lantenhammer developed a 5 valve engine sometime in the 70's.
See:
http://translate.google.com/translate?hl=en&sl=de&u=http://www.bahnsport
.org/weslake.htm&prev=/search%3Fq%3DOtto%2BLantenhammer%2B5%2Bvalve%26nu
m%3D100%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26newwindow%3D1

1984: Yamaha claims the first production motorcycle 5 valve head. See:
http://www.yamaha-motor.co.jp/eng/profile/history/04.html

1987: F3000 Cosworth/Yamaha 5 valve engine. See:
http://perso.wanadoo.fr/woodcote/Tour/history87.html

1989: Mitsubishi Minica sold with turbocharged 5 valve engine. See:
http://www.xs4all.nl/~mjs/mitsubishik.html

1989-1997: Yamaha F-1 effort with 5 valve heads, a flop.

1991: Toyota claims the first production 5 valve car engine, the 4A 20
valve engine. See: http://www2.msstate.edu/~sgn1/MR2/4age.htm

Another interesting link:
http://www.ukcar.com/sframe.htm?/features/tech/Engine/multivalve345.htm

Application of Phase-Averaging Doppler Global Velocimetry to Engine
Exhaust Flows, See:
http://in3.dem.ist.utl.pt/downloads/lxlaser2000/pdf/35_2.pdf

Yamaha sells motorcycles and ATV's with 5 valve heads. Aprilia sells
bikes with 5 valve heads. Ferrari, Audi do too; I'd guess there are
numerous others. 

Several F-1 teams including Ferrari used 5 valves in F-1 for a few
years, but have since gone back to 4 valve heads.

The Taurus SHO was a 4 valve head by Yamaha. See:
http://www.geocities.com/MotorCity/Shop/5254/Funct.html
I checked several Taurus / SHO sites, all said 3.0 24V V6 with 220hp,
not 30 valve.

Enjoy.

Mike Nakamura
Fall City WA USA
mike_nakamura@email.msn.com
91 Spider Veloce
94 164 LS
02 Dakota
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