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Post by gegelung pegas on Sept 7, 2006 15:48:44 GMT 7
blh tlg explain tak kedua2 sekali pastu comparisonnya? tq
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Post by dcruz on Sept 7, 2006 20:12:08 GMT 7
for me vtec is the best....world first variable timing valve technology
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Post by warnwinch on Sept 8, 2006 15:37:11 GMT 7
err..if im not mistaken, the grand daddy of Variable Valve Technology was from Alfa Romeo..
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Post by dcruz on Sept 9, 2006 1:18:36 GMT 7
v-tec born last 16 years, aku ingat tu dah kira lama kot...heheheh...
anyway, v-tec di buat khas untuk power. dgn rpm yang tinggi valve terus buka lagi besar untuk pembakaran air/fuel. system dia guna 'cam lift system'
VVTi dicipta khas untuk save fuel (fuel efficiency), valve akan buka mengikut rpm yang ditetapkan, valve akan buka gradually, dan system yang diguna 'cam phasing' system
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Post by dcruz on Sept 9, 2006 1:20:47 GMT 7
mungkin gee deen tau kebaikan v-tec ni, H22A under the hood
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Post by gegelung pegas on Sept 9, 2006 15:20:16 GMT 7
blh bgtau website maner ader explaination psl nie?
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Post by magic on Sept 9, 2006 17:40:13 GMT 7
VTEC- NA kick ass killer.. VVTi- 'underdog' to kick that NA kick ass killer..
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Post by gaijin on Sept 15, 2006 10:16:56 GMT 7
blh bgtau website maner ader explaination psl nie? i dont thing there a website for this test, may be yes..have to search though but there is a test between v-tec and mivec, its is some where in GArage talk or Car talk.. i think VVTL much better than VVTi, i heard bout it but dont know why.
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Post by pocketrocket on Sept 15, 2006 14:24:58 GMT 7
Gegelung pegas..try to search in importtuner or superstreetonline website if i'm not mistaken..i've read it once ( dah lama..tahun lps kot )..there's a complete explaination bout vtec engines there including history,technology,performance, comparison etc..termasuk dgn cross section images of vtec engines..quite kewl !
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Post by pocketrocket on Sept 16, 2006 2:35:03 GMT 7
I hope this brief explaination might help lil'bit..but i'm sure otai - otai kat sini lebih mengetahui..they're the masters n i'm just a rookie only..my big bro is a VTEC freak..he n his frenz from the Temple Of Vtec ( TOV )website help me alot bout Honda machines..just sumthing to share... VTEC The Honda NCE taskforce was reassigned to the D-development project in November 1986. Under the guidance of Ikuo Kajitani, the team's goal was to create a 100-hp/liter engine for the 1989 Integra. At the same time, the valvetrain team was evaluating the Revolution-modulated Valve-control (REV) technology used in the 1983 Honda motorcycle, the CBR 400F. This technology allowed the four-valve head to operate with just two valves per cylinder for fuel economy at low rpm. A sensor detected engine speed and hydraulically controlled the locker arms, which at higher rpm would lock together with a pin, activating all four valves. The team refined this technology over the next few years, eventually creating VTEC, which not only has variable valve timing, but also variable lift. Instead of turning off two valves during low rpm driving, as was the case with REV, the DOHC VTEC system employs all four valves at all times. The camshaft design had three lobes per cylinder, two low cam lobes and one high cam lobe. The two low cam lobes were tuned for drivability and economy. The high cam lobe actuated a cam follower that was disconnected from the two cam followers that actuated the valves while at low rpm. When the motor reached higher engine speeds, a VTEC solenoid sent hydraulic pressure to locking pins that connect all three cam followers. At this point, only the radical third cam lobe actuated the valves for timing and lift. The increased timing and lift increased airflow in and out of the cylinders at high speed, increasing power output. This technology debuted in April 1989 in the Japanese-spec Integra as the B16A, a 1.6-liter DOHC engine boasting 160 hp. It was followed by the Civic SiR with the same engine in the fall of the same year. As is typical, the U.S. market heard about this, but didn't have the privilege of seeing any of this technology until 1991, when Honda decided to incorporate VTEC into its V6-powered NSX super car. The NSX was an awesome Japanese exotic and as such was way beyond the reach of the average enthusiast. B18C In 1992 average Americans gained access to VTEC technology in the 1.7-liter, 170-hp Integra GS-R engine. The Integra was well received, sending a message up the ladder to Honda Corporate that the company had really hit the mark. VTEC began popping up all over the Honda line, as the engineers incorporated it into both fuel-efficient and high-power applications. In 1992, the Civic EX was equipped with a SOHC 1.6-liter engine that had both excellent mileage and 125 hp. This powerplant only applied VTEC on the intake valves. The Integra GS-R got a bigger motor in 1994, the B18C. This DOHC VTEC screamer had a two-stage intake and 8000-rpm red line that went all the way to 180 hp. When the limited-production, 195-hp Integra Type R hit our shores in 1997, Honda had exceeded the 100-hp/liter goal originally set in 1986. The venerable B16A motor survived virtually unchanged for 11 years, serving in the Civic Del Sol from 1994 to 1997 and the Civic Si from 1999 to 2000. The '90s marked the golden era for Honda's first VTEC motors. Import drag racing exploded in part because of this technology. Few import labels could compete with Honda's little four-banger, despite VTEC's front-wheel-drive configuration. All the top dogs in the scene--Stephan Papadakis, Ed Bergenholtz, Lisa Kubo, Christian Rado, Viet Lam, Charles Madrid, Myles Bautista, Kenny Tran, Jeremy Lookofsky and Dave Shih, to name a few--used Honda's VTEC motor to reach the podium and, for some, the record book. Some have even taken their love of the sport to a professional level, while others have moved on to the business side. Whatever the case, these trailblazers helped lay the industry's foundation with Honda's VTEC motor in tow.
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Post by eros660T on Jul 22, 2007 21:18:37 GMT 7
fuh....vvti vs Vtec...Vtec for the win...layan beb...bpt plak F20C...lagi lazat... ;D
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Post by chinozie on Oct 19, 2007 7:55:07 GMT 7
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