How does VVT work? - Cobalt SS Network

2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

How does VVT work?

Old 05-17-2005, 02:54 PM
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How does VVT work?

So this is a feature on this new engine, but how does it work? Is it controled manually or electronicly and or automaticly? do u get more horses/torq? do u have to change to premium gas if u tune it up? any info would be great, thanks
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Old 05-18-2005, 02:08 AM
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I have a 3.0 VVT Mazda 6 and the way they described it to me is the valves are adjusted electronically to balance hp and torque thru the powerband under current driving conditions. One nice thing you also get with VVt is the ability to do traction control with a 5 speed, it actualy links to sensors so when a tire is sprinning it adjust the valve time to reduce the torque untill the tre stops spinning and gains traction again.
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Old 05-19-2005, 02:59 AM
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ahh thanks
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Old 05-20-2005, 08:07 PM
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Originally Posted by Archplsm
I have a 3.0 VVT Mazda 6 and the way they described it to me is the valves are adjusted electronically to balance hp and torque thru the powerband under current driving conditions. One nice thing you also get with VVt is the ability to do traction control with a 5 speed, it actualy links to sensors so when a tire is sprinning it adjust the valve time to reduce the torque untill the tre stops spinning and gains traction again.
sounds about right. But a car does not need VVT to have traction control. Any ECM can be made to reduce power to a spining tire.
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Old 05-21-2005, 12:20 AM
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Originally Posted by avro206
sounds about right. But a car does not need VVT to have traction control. Any ECM can be made to reduce power to a spining tire.
Yes that is correct as for a ECM. But one really nice thing about VVT is it reduces torque only not hp.
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Old 05-22-2005, 02:30 AM
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There is a replacement for displacement and it's called high compression and piston speed, why do you think that Ferrari and McLaren have 6.0-7.0 L engines that have 10- 12 cylinders?... do the math thatís 500 ccís per cylinder, whatís 2.4 divided by 4? Well there you have it. Unless of course the best automotive manufacturers in the world are being proven wrong by ??Grumman?? Not likely
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Old 05-22-2005, 02:32 AM
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I was into talk to a chev dealer in NS Canada and they didn't seem to know anything about the 2.4L SS, does anyone know if it's only released in the US?
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Old 05-22-2005, 03:29 AM
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Originally Posted by coreyd
I was into talk to a chev dealer in NS Canada and they didn't seem to know anything about the 2.4L SS, does anyone know if it's only released in the US?
Too many dealers are clueless. Canada in paticular--they are the last to know anything. Its coming here for sure so you'll have to wait a bit.
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Old 05-22-2005, 11:44 PM
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yeah the dealers probably wont know about it till they notice the "2.4" on the window stickers.
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Old 05-23-2005, 09:57 AM
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Originally Posted by Archplsm
Yes that is correct as for a ECM. But one really nice thing about VVT is it reduces torque only not hp.
Reduce torque but not horsepower? The equation for horsepower is based on torque.
So if you drop the amount of torque you are going to drop the amount of horsepower.

HP = RPM * (TQ/5252)
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Old 05-23-2005, 06:03 PM
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Here goes nothing...

A camshaft is usually matched to an operating RPM range...the RPM range of which a cam works most efficiently is basically determined by 3 things - lift, duration, and overlap. Generally speaking, the more lift, duration, and overlap a cam has the higher the RPM range a cam can efficiently work...of course the compromise is it isn't as efficient at lower RPMs. Now wouldn't it be nice if you could change 1 or all 3 as the RPMs increase. That's were VVT comes in. Different methods are used by different manufacturers (different methods are used between different engines also) so I won't go into how here...that would take too much space.
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Old 05-23-2005, 06:29 PM
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Exactly. VVT is like having a constantly varying camshaft based on the current RPM.
It is a very good technology that really helps give engines more power across all the
powerband. You get the best of both worlds, low end torque and high end horspower.

I believe the new Mustangs use VVT now, or at least some variation of it.
VTEC has graduated beyond "imports" and is now invading US products.
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Old 05-23-2005, 10:26 PM
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Originally Posted by stlurbanpunk
yeah the dealers probably wont know about it till they notice the "2.4" on the window stickers.
ahhah thats Hilarious, I have no idea why they even get hired. Well thanks itís really good to know that there will be a 2.4L SS they have so much more potential, especially once you get the twin turbos on it

im excited for their release!!
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Old 05-23-2005, 11:42 PM
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ahh, screw boost. I'll take a 2.4 and polish it up nicely.you can add more horses (even more importainly torq) with out slaping turbos on it. its all the little things like ignition and underpullies. thanks for the info on VVT guys! it sounds nice,
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Old 05-25-2005, 05:56 PM
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VVT as used on the LE5 will be an electronically controlled hydraulically actuated(engine oil) system that can vary camshaft timing of the intake AND exhaust cams helical spline actuators bolt to the cams and the timing sprockets are integrated into the actuator.. as oil is forced into or exhausted out of the actuator it will move on its splines changing the position of the cam relative to the crankshaft......the most worthwhile purpose of this is to increase efficiency and therefore hp...also emissions are reduced and higher levels of hp can be reached with little or no sacrifice to idle quality or driveability....when the exhaust cam is retarded the exhasut valve will stay open on the intake stroke scavenging exhaust gas into the cylinder to produce similar results as the digital EGR valve system does....when the intake cam is advanced the intake cam will start to open during the exhaust stroke allowing fresh air into the exhaust stream and performing a similar function to Secondary Air Injection Reaction systems.
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Old 05-25-2005, 06:05 PM
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Originally Posted by coreyd
I was into talk to a chev dealer in NS Canada and they didn't seem to know anything about the 2.4L SS, does anyone know if it's only released in the US?
Considering its not even out yet why would they know or want to know. They would be stupid to tell you to come back in 3 months to get the new model. The 2.4L SS is no more than a "known myth" right now that emans it will happen but its not technically for sure yet
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Old 05-25-2005, 11:37 PM
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Originally Posted by Maven
VVT as used on the LE5 will be an electronically controlled hydraulically actuated(engine oil) system that can vary camshaft timing of the intake AND exhaust cams helical spline actuators bolt to the cams and the timing sprockets are integrated into the actuator.. as oil is forced into or exhausted out of the actuator it will move on its splines changing the position of the cam relative to the crankshaft......the most worthwhile purpose of this is to increase efficiency and therefore hp...also emissions are reduced and higher levels of hp can be reached with little or no sacrifice to idle quality or driveability....when the exhaust cam is retarded the exhasut valve will stay open on the intake stroke scavenging exhaust gas into the cylinder to produce similar results as the digital EGR valve system does....when the intake cam is advanced the intake cam will start to open during the exhaust stroke allowing fresh air into the exhaust stream and performing a similar function to Secondary Air Injection Reaction systems.
ok........ I got something out of this.....lower emmisions, not as harsh on the environment. works for me cus i'm an environmentalist.
no, i get most of it, its auto controled: initiated electronicly and actually carried out mechanicly, with oil.
thanks man!
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Old 06-25-2005, 08:30 PM
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Originally Posted by Maven
VVT as used on the LE5 will be an electronically controlled hydraulically actuated(engine oil) system that can vary camshaft timing of the intake AND exhaust cams helical spline actuators bolt to the cams and the timing sprockets are integrated into the actuator.. as oil is forced into or exhausted out of the actuator it will move on its splines changing the position of the cam relative to the crankshaft......the most worthwhile purpose of this is to increase efficiency and therefore hp...also emissions are reduced and higher levels of hp can be reached with little or no sacrifice to idle quality or driveability....when the exhaust cam is retarded the exhasut valve will stay open on the intake stroke scavenging exhaust gas into the cylinder to produce similar results as the digital EGR valve system does....when the intake cam is advanced the intake cam will start to open during the exhaust stroke allowing fresh air into the exhaust stream and performing a similar function to Secondary Air Injection Reaction systems.



thank you im glad someone has the ability to answer these questions accurately
how long you been mr goodwrench?
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Old 06-26-2005, 04:11 PM
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No problem guys

Solkacs, I have been an ASE certified technician for nearly 10 years, working almost exclusively on GM vehicles the entire time, I have been at my current employer(a South Jersey Chevy dealer) for three years as of August.
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Old 07-10-2005, 12:50 AM
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Originally Posted by cacobaltss
**** u
what the? why are u mad?
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Old 11-10-2009, 02:31 AM
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alright I really have no clue how VVT works but I own a 2008 sport 2.4L with VVT and have heard/ wondered if there was anyway to control when VVT kicks in to produce more hp.... only reason why i'm even asking is because apparently it's controlled electronically and that makes me think that some kind of controller could be used to do this. maybe i'm wrong
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Old 11-10-2009, 02:38 AM
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No way did you just bump this thread. Here's your answer: http://en.wikipedia.org/wiki/Variable_valve_timing and http://auto.howstuffworks.com/camshaft2.htm
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Old 11-10-2009, 02:43 AM
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Originally Posted by Acey View Post
No way did you just bump this thread. Here's your answer: http://en.wikipedia.org/wiki/Variable_valve_timing and http://auto.howstuffworks.com/camshaft2.htm
Bro listen the last post on this thread was 4 years ago. Some people with some good knowledge about this posted here so don't give me ****.
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Old 11-10-2009, 02:51 AM
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To answer your question... VVT doesn't "kick in". It's not VTEC. Read up in those links I posted, it'll take you 5 min and you'll have a vastly greater understanding
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Old 11-10-2009, 02:54 AM
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Originally Posted by Acey View Post
To answer your question... VVT doesn't "kick in". It's not VTEC. Read up in those links I posted, it'll take you 5 min and you'll have a vastly greater understanding
Thanks, chief. **** you.
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