Vvt vct
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Admin formally known as 94rt10ohio
Joined: Apr 2005
Posts: 9,025
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From: Curtice, OH
Vvt vct
So we have that long debate late year... Why the change, which is better, yada, yada.
VCT were earlier builds in 09 and VVT later. Well, the 2010s are back to VCT. Makes me wonder if they ran into an issue with the VVT.
VCT were earlier builds in 09 and VVT later. Well, the 2010s are back to VCT. Makes me wonder if they ran into an issue with the VVT.
Captain
Joined: Feb 2009
Posts: 563
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From: AZ
Thought this was beat to death many months ago. It was determined that its the same engine. Just called something different.
"The 5.7L Eagle engine is equipped with Variable Cam Timing (VCT). This system advances and/or retards the camshaft timing to improve engine performance, mid-range torque, idle quality, fuel economy, and reduce emissions, (V V T is the same just called something different)."
"The 5.7L Eagle engine is equipped with Variable Cam Timing (VCT). This system advances and/or retards the camshaft timing to improve engine performance, mid-range torque, idle quality, fuel economy, and reduce emissions, (V V T is the same just called something different)."
Captain
Joined: Feb 2009
Posts: 563
Likes: 0
From: AZ
As my first post stated. It was determined its the same engine. So no mechanical issues as far as I know. Marketing people do strange things?
Champion
Joined: Dec 2007
Posts: 3,563
Likes: 0
From: Ontario, Canada
I love stuff like this, now everyone is digging up their window sticker cuz they forgot what they have and now they are gonna be all paranoid until the answer is solved. I personally do not feel 390 HP(off topic) I have an old stock 350 cid in my 72 chevy pickup with posi 2wd, a lot lighter truck well maybe 4700lbs but now its lighter has an 88 box, anyway I would say without a doubt that it would smoke this truck out of the hole but when you are going already 60 mph the HEMI would leave the chev behind like it was shut down. So for all intents in purposes for the city this chevy c-10 is all I need too bad for winter the Dodge has 4x4.
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Captain
Joined: Feb 2009
Posts: 563
Likes: 0
From: AZ
No paranoid person here. If people would do a simple search they would find information stating the new gen hemi is the same regardless if it states VCT or VVT on the sticker. End of story.
http://en.wikipedia.org/wiki/Chrysler_Hemi_engine
2009 Revisions</SPAN>
Chrysler has made various revisions to the 5.7 L for the 2009 model year. The first for all applications is what Chrysler calls Variable Camshaft Timing or VCT. VCT (Essentially Variable Valve Timing) uses an oil control valve which controls oil flow to a unique camshaft sprocket which contains a phasing, which depending on the operation of the oil control valve either advances or retards camshaft timing.
Cylinder heads have been revised to increase flow. Though the intake manifold has also been changed on all applications, it is however model specific. Dodge Ram, non-Hybrid Electric Vehicle (HEV) Chrysler Aspens, and non-HEV Dodge Durango utilize an active intake manifold with a short runner valve to optimize torque and horsepower. At lower engine RPM the valve is closed, resulting in improved low-end torque from the longer runners. At higher engine RPM the valve is opened, diverting the incoming air into the center of the manifold. The shorter runners results in improved horsepower. Passenger cars, Jeep vehicles, and HEV Chrysler Aspen & HEV Dodge Durango do not use this manifold, these vehicles utilize a passive intake manifold, which does not have a short runner valve.
http://www.thehemi.com/forums/viewtopic.php?p=10710
Re: the 2009 5.7L HEMI that's coming in the Dodge Ram trucks.
The PR says variable valve timing (VVT) but I have read people
calling it variable cam timing (VCT). I have some more details.
The new generation HEMI employs cam phasers -- thus it is VCT.
They chose to use VVT in their various marketing dialogs in order
for more mass appeal, since VVT is more widely known than VCT.
http://en.wikipedia.org/wiki/Chrysler_Hemi_engine
2009 Revisions</SPAN>
Chrysler has made various revisions to the 5.7 L for the 2009 model year. The first for all applications is what Chrysler calls Variable Camshaft Timing or VCT. VCT (Essentially Variable Valve Timing) uses an oil control valve which controls oil flow to a unique camshaft sprocket which contains a phasing, which depending on the operation of the oil control valve either advances or retards camshaft timing.
Cylinder heads have been revised to increase flow. Though the intake manifold has also been changed on all applications, it is however model specific. Dodge Ram, non-Hybrid Electric Vehicle (HEV) Chrysler Aspens, and non-HEV Dodge Durango utilize an active intake manifold with a short runner valve to optimize torque and horsepower. At lower engine RPM the valve is closed, resulting in improved low-end torque from the longer runners. At higher engine RPM the valve is opened, diverting the incoming air into the center of the manifold. The shorter runners results in improved horsepower. Passenger cars, Jeep vehicles, and HEV Chrysler Aspen & HEV Dodge Durango do not use this manifold, these vehicles utilize a passive intake manifold, which does not have a short runner valve.
http://www.thehemi.com/forums/viewtopic.php?p=10710
Re: the 2009 5.7L HEMI that's coming in the Dodge Ram trucks.
The PR says variable valve timing (VVT) but I have read people
calling it variable cam timing (VCT). I have some more details.
The new generation HEMI employs cam phasers -- thus it is VCT.
They chose to use VVT in their various marketing dialogs in order
for more mass appeal, since VVT is more widely known than VCT.
