Honda vs. Toyota's Variable Valve Timing
Wannabe yuppie
Joined: Dec 2000
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From: Madison, WI
The simple answer:
The VVT-i system on your buddy's tC varies the timing of the intake cam, while i-VTEC varies both the cam timing and the cam profile itself. Depending on which i-VTEC engine you're talking about this could be either on just the intake or both the intake and exhaust.
The more complex answer: https://www.honda-acura.net/forums/s...ad.php?t=34779
The VVT-i system on your buddy's tC varies the timing of the intake cam, while i-VTEC varies both the cam timing and the cam profile itself. Depending on which i-VTEC engine you're talking about this could be either on just the intake or both the intake and exhaust.
The more complex answer: https://www.honda-acura.net/forums/s...ad.php?t=34779
my bum is on the swedish!
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From: San Antonio, Texas
Originally Posted by dubster99
The GSR and newer H22 preludes have dual runner intake manifolds. They promote better torque in the lower-mid range, and then once you reach a certain rpm (5500 in the gsr) the butterflies route the airflow to shorter intake manifold runners for maximum all out power.
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From: Location Location
Originally Posted by alphaxxn
ah alright, I was pretty sure that Alfa was one of the firsts atleast, but it wasnt in 91, way earlier.
it was alfa. back in the 60's i believe, possibly early 70's
the best system currently is BMWs Valvetronic system. It works with double VANOS.
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Originally Posted by WiLL
...I really wanna get out and shoot people.
Joined: Oct 2000
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From: Location Location
Originally Posted by 18secFerio
naturally
bmw > * :chuckles:
bmw > * :chuckles:
not just my opinion. I honestly don't know much about the different systems. the industry experts voted bmw system to be the best.
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Originally Posted by WiLL
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h:
Professor
Joined: May 2004
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From: ...in your gf's pants
The concept of variable valve timing is a lot older than you think. It has been available for most Domestic RWD V8 cars for decades....ever hear of Rhoads variable duration lifters? The concept dates to at least the early '60s, probably much earlier. Here is a little background information on Rhoads Lifters