iVTEC WTF?
Can you spot me 20 cars?
Joined: Aug 2003
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Different cams.I do know that much.The word is you need the typeS cams to make power.For some strange reason the SI cams are more towards fuel economy.I want to swap a K series into an EK but i am waiting for more development towords forced induction.
Dr. Doom
Joined: Mar 2003
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10/26/00 - The New Generation "DOHC i-VTEC" is Announced
Honda Motor Company has announced a newly developed 2-liter engine, dubbed the "DOHC i-VTEC" to be mated to the upcoming new model, "Stream." The engine combines world-class fuel-efficiency with low emissions, light weight, and high-output.
This new engine utilizes Honda's "VTEC" technology, which adjusts valve timing and lift based on the engine's RPM, but adds "VTC" - Variable Timing Control - which continuously modulates the intake valve overlap depending on engine load. The two combined yield in a highly intelligent valve timing and lift mechanism.
In addition to such technology, improvements in the intake manifold, rearward exhaust system, lean-burn-optimized catalytic converter *1 help to create an engine that outputs 113kW (154PS) @ 6500rpm, *2 and provides ample mid-range torque. It also satisfies the year 2010 fuel efficiency standard of 14.2km/L *3 (roughly 35mpg), and receives the government standard of "LEV" *4. A highly durable lower block and a chain-driven cam were just some of the improvements in an effort to create a more compact engine - resulting in an engine that is 10% lighter *5 than conventional 2-liter engines.
Honda has dubbed these engines with high fuel-economy 'intelligence' as their new "i-Series" engines. By 2005, Honda aims to have all of their engines replaced by the "i-Series" engines. Under this plan, all vehicles sold within Japan will be certified by the government as LEV *4 by the year 2002, and by the year 2005, plans on satisfying the year 2010 fuel efficiency standard across all weight classes.
*1 - Lean-burn compatible NOx catalytic converters are equipped on the Stream 2.0L model iL, iS, FF
*2 - Stream 2.0L, iL, iS, FF Net
*3 - Stream 2.0L, iL, FF 10*15 mode
*4 - A designation given to vehicles that are under 50% of the year 2000 emission standards.
*5 - Compared to typical Honda 2.0 liters.
Note : Article translated verbatim from the tech section of the official Honda of Japan's web-site at http://www.honda.co.jp. This article is intended solely for the benefit of Temple of VTEC Asia's readers. The original article did not have the power curve chart. That has been added to enhance the article.
Honda Motor Company has announced a newly developed 2-liter engine, dubbed the "DOHC i-VTEC" to be mated to the upcoming new model, "Stream." The engine combines world-class fuel-efficiency with low emissions, light weight, and high-output.
This new engine utilizes Honda's "VTEC" technology, which adjusts valve timing and lift based on the engine's RPM, but adds "VTC" - Variable Timing Control - which continuously modulates the intake valve overlap depending on engine load. The two combined yield in a highly intelligent valve timing and lift mechanism.
In addition to such technology, improvements in the intake manifold, rearward exhaust system, lean-burn-optimized catalytic converter *1 help to create an engine that outputs 113kW (154PS) @ 6500rpm, *2 and provides ample mid-range torque. It also satisfies the year 2010 fuel efficiency standard of 14.2km/L *3 (roughly 35mpg), and receives the government standard of "LEV" *4. A highly durable lower block and a chain-driven cam were just some of the improvements in an effort to create a more compact engine - resulting in an engine that is 10% lighter *5 than conventional 2-liter engines.
Honda has dubbed these engines with high fuel-economy 'intelligence' as their new "i-Series" engines. By 2005, Honda aims to have all of their engines replaced by the "i-Series" engines. Under this plan, all vehicles sold within Japan will be certified by the government as LEV *4 by the year 2002, and by the year 2005, plans on satisfying the year 2010 fuel efficiency standard across all weight classes.
*1 - Lean-burn compatible NOx catalytic converters are equipped on the Stream 2.0L model iL, iS, FF
*2 - Stream 2.0L, iL, iS, FF Net
*3 - Stream 2.0L, iL, FF 10*15 mode
*4 - A designation given to vehicles that are under 50% of the year 2000 emission standards.
*5 - Compared to typical Honda 2.0 liters.
Note : Article translated verbatim from the tech section of the official Honda of Japan's web-site at http://www.honda.co.jp. This article is intended solely for the benefit of Temple of VTEC Asia's readers. The original article did not have the power curve chart. That has been added to enhance the article.
Hope this helps. It apears that i-VTEC covers both valve and ignition timing. whereas VTEC controlled valve timing.
Last edited by Josh; Sep 9, 2003 at 07:31 AM.
Strict Machine
Joined: May 2001
Posts: 9,604
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K20a2 - RSX-S = variable cam timing, higher compression
K20a3 - Civic Si, RSX = no variable cam timing
^ just cliffnotes simply put.....check out www.ClubRSX.com for tech articles, its too late for me to check em right now
K20a3 - Civic Si, RSX = no variable cam timing
^ just cliffnotes simply put.....check out www.ClubRSX.com for tech articles, its too late for me to check em right now
__________________
2012 FIAT 500 ABARTH
2012 FIAT 500 ABARTH
Hi Hi Hi?
Joined: May 2003
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the rsx runs 11:1 and the Si runs 9.8:1. the rsx actually has the vtec we're all used to at like 5800 rpm i think (rsx owners correct me if im wrong) but the Si only has a slight change over at like 2800 rpm that is not even noticeable. they designed the Si for fuel economy and not performance. u need the rsx head if u plan on making any kind of big power out of k series all-motor wise. the rsx head was definetly designed much better. plus the vtc is gonna open up a whole new level of performance cuz u can change the timing of the intake cam anywhere in the powerband. the toda spec a kit for the rsx motor makes 225 to the wheels. thats pretty tight all motor and it still has stock driveablility. just wait til someone builds a 12.5:1 compression 2.4 liter k series with a heavily ported rsx type r head and some toda c's. id bet they can get 300 to the wheels easy 
