fake v-tec?
Honda-Tech Member
Joined: Apr 2004
Posts: 876
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From: Michigan
Re: fake v-tec? (Mr.ITB)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.ITB »</TD></TR><TR><TD CLASS="quote">does the k20a3 motor have vtec or not? jus curious...
people say it has fake vtec....
</TD></TR></TABLE>
yea its got 'fake' vtec
people say it has fake vtec....
</TD></TR></TABLE>yea its got 'fake' vtec
Honda-Tech Member
Joined: May 2006
Posts: 662
Likes: 1
From: palos hills, il, usa
Re: (ballerchild)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ballerchild »</TD></TR><TR><TD CLASS="quote">i didn't know rota makes vtec 
</TD></TR></TABLE>
hahaha, very nice!
</TD></TR></TABLE>hahaha, very nice!
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Joined: Mar 2007
Posts: 6
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From: Sydney, NSW, Australia
Re: (mrnewguy)
iVtec is not 'fake", it still has similar characteristics to lifting valves its just that for "economy's" sake it shuts off one of the intake valves (per cylinder) when at low engine speed. Quite clever really.
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Joined: Oct 2001
Posts: 3,310
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From: ILM, NC
Re: fake v-tec? (Mr.ITB)
taken from here......
http://www.hondanews.com/categ...=2003
http://www.hondanews.com/categ...s/426
i-VTEC VALVE-CONTROL SYSTEM
The innovative Variable Valve Timing and Lift Electronic Control (VTEC) system made its debut on the Acura NSX supercar, delivering abundant low-rpm torque, exhilarating high-rpm power, and outstanding fuel efficiency.
Now, on the all-new 2002 RSX, Acura unveils the latest version of this remarkable engine system: i-VTEC. The "intelligent," i-VTEC system adds new VTC (Variable Timing Control) to VTEC to provide continuously variable camshaft timing - taking the concept of variable valve timing to new heights. In short, i-VTEC = VTEC + VTC. Not only does i-VTEC provide a substantial performance increase across a broad power band, it boosts fuel economy while also reducing engine emissions.
VTEC (Variable Timing and Lift Electronic Control)
The innovative VTEC system is able to adjust the lift and opening duration of the valves to help the engine produce both abundant low-rpm torque and excellent high-rpm power. At low rpm, VTEC adjusts valve timing and lift for optimum cylinder filling. In addition, the timing of the intake valves is staggered and their lift asymmetric - creating a swirl effect within the combustion chambers. The result is increased burn speed with improved combustion stability. As engine rpm builds, VTEC transitions to a high-lift, long-duration cam profile for improved high-rpm engine output
The RSX uses two variations of VTEC, a new streamlined version for the RSX, and a high-performance version for the Type-S.
The 160 horsepower RSX employs a new version of VTEC to boost performance and reduce emissions that applies variable timing and lift to the intake valves only. Additionally, the RSX system is further simplified by utilizing only two roller arms per pair of intake valves (instead of the usual three). During low rpm operation, intake air is drawn almost exclusively through the primary intake valve, thereby creating a very strong swirl effect to maximize combustion. At 2,200 rpm, the secondary rocker arm engages the primary rocker causing both intake valves to open for the same lift and duration, substantially increasing airflow into the cylinder and boosting performance.
The 200 horsepower RSX Type-S uses the same high-performance VTEC design as the NSX, a three rocker arm system that varies the lift and duration of both the intake and exhaust valves for maximum power output. At lower rpm, the valves follow low lift, short duration camshaft profiles to help boost low-end torque. Above 5,800 rpm, the intake and exhaust valves are operated by high-lift, long-duration cam profiles, for maximum high rpm horsepower.
When combined with VTC, both versions help the RSX engine produce a remarkably broad and smooth power band with exceptional torque and horsepower.
VTC (Variable Timing Control)
The new i-VTEC system adds a new camshaft VTC (Variable Timing Control) system to VTEC for continuously variable camshaft phasing across the engine's entire power band. As engine rpm builds, a VTC actuator - controlled by an engine-control unit that monitors cam position, ignition timing, exhaust O2, and throttle position - ;advances or retards the intake cam throughout the 50 degree range, optimizing engine output and reducing emissions.
During typical operation, the intake camshaft timing is almost fully retarded at idle to help provide more stable idling while reducing exhaust emissions (NOx). As rpm increases, the intake camshaft is advanced, opening the intake valve sooner and providing additional valve overlap. This results in increased fuel economy (by reducing pumping losses) and a further reduction in exhaust emissions (by creating a large, internal exhaust gas re-circulation effect).
Also, to generate additional power throughout the rev range, the intake camshaft is continuously varying the amount of advance or retard, instantly adjusting to provide additional power as required by the driver.
CYLINDER HEAD / VALVETRAIN
The RSX engine uses an aluminum cylinder head and a double-overhead-cam, four-valve-per-cylinder valvetrain incorporating the new i-VTEC system. A generous "squish" area around the combustion chambers yields increased gas turbulence for faster flame propagation and excellent efficiency. The camshafts are operated by a silent-chain drive that helps provide smooth, refined performance while also being maintenance-free.
http://www.hondanews.com/categ...=2003
http://www.hondanews.com/categ...s/426
i-VTEC VALVE-CONTROL SYSTEM
The innovative Variable Valve Timing and Lift Electronic Control (VTEC) system made its debut on the Acura NSX supercar, delivering abundant low-rpm torque, exhilarating high-rpm power, and outstanding fuel efficiency.
Now, on the all-new 2002 RSX, Acura unveils the latest version of this remarkable engine system: i-VTEC. The "intelligent," i-VTEC system adds new VTC (Variable Timing Control) to VTEC to provide continuously variable camshaft timing - taking the concept of variable valve timing to new heights. In short, i-VTEC = VTEC + VTC. Not only does i-VTEC provide a substantial performance increase across a broad power band, it boosts fuel economy while also reducing engine emissions.
VTEC (Variable Timing and Lift Electronic Control)
The innovative VTEC system is able to adjust the lift and opening duration of the valves to help the engine produce both abundant low-rpm torque and excellent high-rpm power. At low rpm, VTEC adjusts valve timing and lift for optimum cylinder filling. In addition, the timing of the intake valves is staggered and their lift asymmetric - creating a swirl effect within the combustion chambers. The result is increased burn speed with improved combustion stability. As engine rpm builds, VTEC transitions to a high-lift, long-duration cam profile for improved high-rpm engine output
The RSX uses two variations of VTEC, a new streamlined version for the RSX, and a high-performance version for the Type-S.
The 160 horsepower RSX employs a new version of VTEC to boost performance and reduce emissions that applies variable timing and lift to the intake valves only. Additionally, the RSX system is further simplified by utilizing only two roller arms per pair of intake valves (instead of the usual three). During low rpm operation, intake air is drawn almost exclusively through the primary intake valve, thereby creating a very strong swirl effect to maximize combustion. At 2,200 rpm, the secondary rocker arm engages the primary rocker causing both intake valves to open for the same lift and duration, substantially increasing airflow into the cylinder and boosting performance.
The 200 horsepower RSX Type-S uses the same high-performance VTEC design as the NSX, a three rocker arm system that varies the lift and duration of both the intake and exhaust valves for maximum power output. At lower rpm, the valves follow low lift, short duration camshaft profiles to help boost low-end torque. Above 5,800 rpm, the intake and exhaust valves are operated by high-lift, long-duration cam profiles, for maximum high rpm horsepower.
When combined with VTC, both versions help the RSX engine produce a remarkably broad and smooth power band with exceptional torque and horsepower.
VTC (Variable Timing Control)
The new i-VTEC system adds a new camshaft VTC (Variable Timing Control) system to VTEC for continuously variable camshaft phasing across the engine's entire power band. As engine rpm builds, a VTC actuator - controlled by an engine-control unit that monitors cam position, ignition timing, exhaust O2, and throttle position - ;advances or retards the intake cam throughout the 50 degree range, optimizing engine output and reducing emissions.
During typical operation, the intake camshaft timing is almost fully retarded at idle to help provide more stable idling while reducing exhaust emissions (NOx). As rpm increases, the intake camshaft is advanced, opening the intake valve sooner and providing additional valve overlap. This results in increased fuel economy (by reducing pumping losses) and a further reduction in exhaust emissions (by creating a large, internal exhaust gas re-circulation effect).
Also, to generate additional power throughout the rev range, the intake camshaft is continuously varying the amount of advance or retard, instantly adjusting to provide additional power as required by the driver.
CYLINDER HEAD / VALVETRAIN
The RSX engine uses an aluminum cylinder head and a double-overhead-cam, four-valve-per-cylinder valvetrain incorporating the new i-VTEC system. A generous "squish" area around the combustion chambers yields increased gas turbulence for faster flame propagation and excellent efficiency. The camshafts are operated by a silent-chain drive that helps provide smooth, refined performance while also being maintenance-free.
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