Evo 9 engine...spot the difference?
Apr 15, 2005, 10:46 AM
#17
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People often confuse Variable Valve Timing with a system like VTEC, which are totally different. Same with Toyota's VVT-i and VVTL-i
VVT-i, MIVEC, and the "i" part of i-VTEC refer to the variation of the intake cam timing, which in turn varies valve timing, relative to the crankshaft. Basically the ECU can make changes just as you change on your adjustable cam gears, but the ECU can do it on the fly, and vary it depending on RPM. This can greatly improve emmisions and power output.
the "L" in VVTL-i and VTEC (Variable Valve Timing and Electronic Lift Control) refers to variable valve LIFT. The Cam Profile can physically be changed, allowing both higher lift and longer duration, which has significant impact on high-RPM power output. Old Honda VTEC motors did not have variable cam timing, only the cam-lobe switching lift changes. The new Honda i-VTEC motors have both, as do the Toyota VVTL-i motors.
- Steve
VVT-i, MIVEC, and the "i" part of i-VTEC refer to the variation of the intake cam timing, which in turn varies valve timing, relative to the crankshaft. Basically the ECU can make changes just as you change on your adjustable cam gears, but the ECU can do it on the fly, and vary it depending on RPM. This can greatly improve emmisions and power output.
the "L" in VVTL-i and VTEC (Variable Valve Timing and Electronic Lift Control) refers to variable valve LIFT. The Cam Profile can physically be changed, allowing both higher lift and longer duration, which has significant impact on high-RPM power output. Old Honda VTEC motors did not have variable cam timing, only the cam-lobe switching lift changes. The new Honda i-VTEC motors have both, as do the Toyota VVTL-i motors.
- Steve
Apr 15, 2005, 10:47 AM
#18
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Originally Posted by ODB4G63
I was just wondering because I got the impression that I must be stupid or something when you welcomed me to the 21st century......well maybe you were just refering to the changes in the 4g63.
sorry man, I didn't mean you, I mean the engine technology of the 4G63... as in it's been out of date forever, and it finally got variable cam timing.Sorry for the confusion...
Apr 15, 2005, 10:53 AM
#19
Originally Posted by SuperHatch
sorry man, I didn't mean you, I mean the engine technology of the 4G63... as in it's been out of date forever, and it finally got variable cam timing.Sorry for the confusion...
Apr 15, 2005, 10:53 AM
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That "area" on each leaf of the clover should be good for about 20-30 total degrees of advancement/retardation. Looks like the setup on the new 4 cyl. Honda engines (- the variable intake valve timing). I wonder if it'll react like my 02 Si did. It would cough through the intake when the engine was cold. When I would step on the gas pedal and let off to shift and get on the gas again, the timing would change, reveert to normal, and then be asked to change again causing a slight misfire. It never did damage, but it sounded strange with an aftermarket open intake. Makes for great low end power though. I may have to trade in the 05 one day.
Apr 15, 2005, 10:56 AM
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I can't see this addition being a bad thing. Once the tuners can crack the Code of the ECU that controls this function we will see some serious improvements in power production. Especially with aftermarket camshafts....
Apr 15, 2005, 11:03 AM
#22
Originally Posted by SuperHatch
I can't see this addition being a bad thing. Once the tuners can crack the Code of the ECU that controls this function we will see some serious improvements in power production. Especially with aftermarket camshafts....
I agree.... my question is how hard would it be to adapt this setup to an older 4g63 setup.
Keith
Apr 15, 2005, 11:08 AM
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Originally Posted by Fourdoor
I agree.... my question is how hard would it be to adapt this setup to an older 4g63 setup.
Keith
Keith
made it a bolt on change, since changing a cast is expensive, and is cheap Electronics-wise however, this could get tricky. I'm not even going to venture to pretend that I understand engine management, I'm sure Al, Shiv, the Works crew or even Zeus or MBJack would have something much more useful to say than anything I would babble about
Apr 15, 2005, 11:59 PM
#29
Originally Posted by SuperHatch
People often confuse Variable Valve Timing with a system like VTEC, which are totally different. Same with Toyota's VVT-i and VVTL-i
VVT-i, MIVEC, and the "i" part of i-VTEC refer to the variation of the intake cam timing, which in turn varies valve timing, relative to the crankshaft. Basically the ECU can make changes just as you change on your adjustable cam gears, but the ECU can do it on the fly, and vary it depending on RPM. This can greatly improve emmisions and power output.
the "L" in VVTL-i and VTEC (Variable Valve Timing and Electronic Lift Control) refers to variable valve LIFT. The Cam Profile can physically be changed, allowing both higher lift and longer duration, which has significant impact on high-RPM power output. Old Honda VTEC motors did not have variable cam timing, only the cam-lobe switching lift changes. The new Honda i-VTEC motors have both, as do the Toyota VVTL-i motors.
- Steve
VVT-i, MIVEC, and the "i" part of i-VTEC refer to the variation of the intake cam timing, which in turn varies valve timing, relative to the crankshaft. Basically the ECU can make changes just as you change on your adjustable cam gears, but the ECU can do it on the fly, and vary it depending on RPM. This can greatly improve emmisions and power output.
the "L" in VVTL-i and VTEC (Variable Valve Timing and Electronic Lift Control) refers to variable valve LIFT. The Cam Profile can physically be changed, allowing both higher lift and longer duration, which has significant impact on high-RPM power output. Old Honda VTEC motors did not have variable cam timing, only the cam-lobe switching lift changes. The new Honda i-VTEC motors have both, as do the Toyota VVTL-i motors.
- Steve
Apr 16, 2005, 01:50 AM
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http://www.mitsubishi-motors.co.jp/E...ormance01.html
get your own photoes there ..
tells you about the cloverleaf and the turbine and compressor and a host of other things
translater services IF you don't know how to read ..
www.tans.org/translater.shtml
get your own photoes there ..
tells you about the cloverleaf and the turbine and compressor and a host of other things
translater services IF you don't know how to read ..
www.tans.org/translater.shtml