When Does MIVEC Kick In...?
When Does MIVEC Kick In...?
So all these variable valve timing things like the famous, but over-rated VTECand I-VTEC that you feel in the higher RPM's, and the VVTL-I on the celica that you feel on the higher RPM's, so where does MIVEC stand? I know it works in the lower and mid RPM's, but is it like the civic or celica? The car has a nice grunt and low and mid, is that MIVEC? Just wondering, cuz I wanna yell out MIVEC!!! as I pass a sI 
Last edited by Arithmetic; Sep 21, 2004 at 01:54 PM.
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From: A
Short answer, 3500rpm.
Excellent article though! I never knew a few things.
So before 3500, the 2 intake valves are opening at different lift for high swirl in the combustion chamber. After 3500, the T lever that is being moved by the center lobe is engaged and both valves open more and for a longer period of time. A very neat system.
Excellent article though! I never knew a few things.
So before 3500, the 2 intake valves are opening at different lift for high swirl in the combustion chamber. After 3500, the T lever that is being moved by the center lobe is engaged and both valves open more and for a longer period of time. A very neat system.
This is awesome my brother & all his VTEC talk... He's always like what's MIVEC? & I kind of b.s. my way through it... finally some good detailed description... i'm just going to quote the whole thing to him...
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Originally Posted by AlkalineTrio124
This is awesome my brother & all his VTEC talk... He's always like what's MIVEC? & I kind of b.s. my way through it... finally some good detailed description... i'm just going to quote the whole thing to him...
There have been high lift cams since, forever. You know a car has a cam like that when it idles like poop. You know a car has a mild cam when it has a smooth idle. What variable valve timing does is allow a car to have a mild cam (at idle/low rpm) for good fuel economy and smooth running and also allow it to have high lift/duration (at high rpm) for maximum air/fuel flow and power. Prior to VTEC, you could have one, or the other. Now we can have both.
It's not like a VTEC/MIVEC engine is far superior to anything without variable valve timing. But it helps economy (at low rpm) and power (at high rpm).
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the dood who made vtec moved to mitsu after 10 years in honda... :P
Originally Posted by captain150
Variable valve timing isn't "all that"
There have been high lift cams since, forever. You know a car has a cam like that when it idles like poop. You know a car has a mild cam when it has a smooth idle. What variable valve timing does is allow a car to have a mild cam (at idle/low rpm) for good fuel economy and smooth running and also allow it to have high lift/duration (at high rpm) for maximum air/fuel flow and power. Prior to VTEC, you could have one, or the other. Now we can have both.
It's not like a VTEC/MIVEC engine is far superior to anything without variable valve timing. But it helps economy (at low rpm) and power (at high rpm).
There have been high lift cams since, forever. You know a car has a cam like that when it idles like poop. You know a car has a mild cam when it has a smooth idle. What variable valve timing does is allow a car to have a mild cam (at idle/low rpm) for good fuel economy and smooth running and also allow it to have high lift/duration (at high rpm) for maximum air/fuel flow and power. Prior to VTEC, you could have one, or the other. Now we can have both.
It's not like a VTEC/MIVEC engine is far superior to anything without variable valve timing. But it helps economy (at low rpm) and power (at high rpm).
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Originally Posted by Nad1370
I always thought MIVEC was on all the time ( except maybe at idle ) . Adjusting at every rpm for omptimum power and economy.
Originally Posted by Arithmetic
my adobe keeps stalling on me, so i cant read that dam doc. I still would like to read a comprehensive report on it, im a reader nut. 
http://216.239.51.104/search?q=cache..._08.pdf+&hl=en
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Also it should be noted that Mivec only operates these new valve timings on the INTAKE valves...where VTEC uses both Intake and Exhaust valves. I thought this should be said. But knowing how ****ty my buddy's 04' iVTEC SI is...I'm not sure I would be impressed by this new info... :P