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Shoe
GenIII
 
1/19/2007
19:09:06
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 Subject: Hemi going to VVT?
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I work at a gear manufacturing plant and we just got a new part. It is going to be for the Hemi and it is the camshaft sprocket. Apparently it looks like the Hemi is going to start using Variable Valve Timing (VVT). I cannot wait!
'97 RC V6, 5spd, soon to be V8, 5spd!
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OBIOD3
Dodge Dakota
JOIN HERE
1/20/2007
02:09:57
|  RE: Hemi going to VVT?
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u know something the hemi's use hemispherical heads and ur wrong cause they are now running deisel liquids.......
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Marv
Dodge Dakota
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1/20/2007
19:15:10
|  RE: Hemi going to VVT?
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"hemi's use hemispherical heads"
Old news. That's why they're called Hemi.
"they are now running deisel liquids"
Diesel liquids? WTF is that?
What does that have to do with the possibility of VVT on a hemi engine?
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Kowalski
GenIII
1/20/2007
19:31:57
| RE: Hemi going to VVT?
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Marv - nothing. One of the drawbacks of the fairly unfettered exchange of information on this site is that we have a few flamers here. Looks like in this case, he is spoofing a decent and knowledgeable guy who posts as OBIO3. Often this is the work of someone who posts as "STS", and also under many other names.
Shoe - thanks for the info.
Lead, follow, or get out of the way
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Super bee
GenI
1/21/2007
22:28:26
| RE: Hemi going to VVT?
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what is a diesel liquid?
i dont get it?
1990 sport RC SB, 1995 318drivetrain, 3.92 gears (came with truck) Powertrax "traction system", 95 dash/steering wheel, hearthrob exhaust, headers, cutout after y-pipe, necessary electric fan add-a-leafs, 30x9.5 mud tires, cranked T-bars, AR 39 15x8 rims, grill guard, roll bars
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Marv
Dodge Dakota
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1/22/2007
12:52:50
| RE: Hemi going to VVT?
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After some thinking on it, questions come up.
Shoe didn't mention which hemi engine, but why would Dodge put VVT in the hemi when they've no doubt spent money implimenting MDS for that engine? Is MDS is going away because Dodge is aware of possible long term reliability issues?
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Kowalski
GenIII
1/22/2007
13:12:01
| RE: Hemi going to VVT?
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Marv - you seem to be implying that VVT and MDS are mutually exclusive. Can you explain why ? I'm not aware of that, and not all versions of the hemi are MDS...
Lead, follow, or get out of the way
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GraphiteDak
GenIII
1/22/2007
13:57:29
| RE: Hemi going to VVT?
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I would be curious how dependable the MDS is these days. It sucked in the 80's when cadillac did it.
As far as VVT. How would they do that properly on a in the block camshaft engine? Again playing with the rocker arms somehow changing lift but little effect on actual timing change. Most VVT engines control the INTAKE cam shaft degree and valve lift with other lobes engaged by hydrloic pressure or other means. The 4.7 would have a better chance getting it if they swapped the SOHC of DOHC heads like the Tundra 4.7 uses.
So many rumors on what Dodge will do, that u can never trust anything until they actually come out and advertise it themselves!
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Marv
Dodge Dakota
JOIN HERE
1/22/2007
14:57:32
| RE: Hemi going to VVT?
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I guess I did, but I didn't mean it that way. I know all hemi engines are not equipped with MDS.
It does seem to me that having MDS and VVT on an engine might over-complicate things from a driveability standpoint.
And GraphiteDak brings up a good point about the cam-in-block implimentation of VVT - You can't change the intake valve timing without affecting the exhaust valve timing, and vice versa. It would be more easily done in an OHC engine, and best in a DOHC engine.
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1hotkadota
Dodge Dakota
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1/22/2007
16:22:34
| RE: Hemi going to VVT?
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Craprolet is doing their D.O.D. (displacement on demand)system with the 5.3L V8 in the Impala SS. I'm not positive but I believe that is an OHV engine.
How they do it beats me.
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GraphiteDak
GenIII
1/22/2007
19:54:58
| RE: Hemi going to VVT?
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If it is, it's different form the 5.3, cam in the block, truck engine.
Let me look...
http://www.chevrolet.com/pop/impala/2007/v8_engine_en.jsp
Nope. It's an alumninum block 5.3 with the D.O.D. and the cam is in the block. No VVT
But they have VVT on the V6 engines as well.
Well, their 3.9 V6 is a cam in the block. But has VVT. I bet that biatch has all sorts of fruity crap connectd to the rockers or lifters somehow.
I'd rather see the VVT attached to a dual overhead cam setup. Then there is plenty of room to machine in the components to switch to different cam lobes, and degree the intake cam on it's own.
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Shoe
GenIII
1/22/2007
20:09:35
| RE: Hemi going to VVT?
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I do not know anymore specifics other that it says, for HEMI engine. I will to try to look into it.
'97 RC V6, 5spd, soon to be V8, 5spd!
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ryan
Dodge Dakota
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1/22/2007
21:47:49
| RE: Hemi going to VVT?
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lmao, craprolet. how about craprolet changes the names to some of their cars. like the craprice, crapilier, crapica, imcrapla, crapvette and crapmaro. i think those are more suitible names instead of caprice, cavalier, corsica, impala, corvette, and camaro.
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Craptastic
Dodge Dakota
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1/22/2007
22:09:53
| RE: Hemi going to VVT?
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What's up with ryan?
Bad experience in a GM car?
Just hate Chevy, or are Pontiac, Cadillac and GMC included?
They're partners with Isuzu, too y'know.
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clint282cc
Dodge Dakota
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1/22/2007
23:34:16
| RE: Hemi going to VVT?
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i never really knew this so do you think you could explain to me what veriable valve timing is?
and what is MDS?
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Josh
Dodge Dakota
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1/23/2007
00:12:37
| RE: Hemi going to VVT?
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Toyota VVT:
http://en.wikipedia.org/wiki/VVT-i
Other VVT:
http://en.wikipedia.org/wiki/Variable_valve_timing
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Kowalski
GenIII
1/23/2007
07:29:41
| RE: Hemi going to VVT?
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And MDS is multiple displacement system, or something to that effect - reduces the # of cylinders the engine is running on when less power is needed.
Lead, follow, or get out of the way
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GRETCH
Dodge Dakota
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1/23/2007
07:34:29
| RE: Hemi going to VVT?
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heck, lets throw Ford and Nissans CVT (continous variable transmission)into the mix to make it a litle more confusing.
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Chris G.
Dodge Dakota
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1/23/2007
09:18:18
| RE: Hemi going to VVT?
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I see promise in CVT....could eventually provide better ratios for hill climbing besides the set ratio's in the tranny.
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sneilan
Dodge Dakota
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1/23/2007
17:37:07
| RE: Hemi going to VVT?
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CVT is the most annoying thing ever invented!!! i am a technician at a Ford dealership,( well, i was until 3 months ago when i decided to do a career change cus i grew to hate working on other peoples cars and not my own, but thats neither here nor there) and the first time a drove a CVT car i thought the damn thing was broken! took me a while to feel like an idiot and realize that it was CVT.
Sean
1998 Dakota CC 5.2L
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Shoe
GenIII
2/09/2007
00:57:10
| RE: Hemi going to VVT?
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I got a little bit more information that should help out a little bit. We will be making both the camshaft gears and the crank sprocket. Basically it is the same setup found in the GM Hybrid SUVs. Looks like DC is stealing from GM. How sad.
'97 RC V6, 5spd, soon to be V8, 5spd!
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