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jeffster
Dakota Enthusiast
 
3/30/2001
21:58:14
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 Subject: 5.7 Hemi article
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The Hemi Returns
DaimlerChrysler’s iconic V-8 is reborn to power trucks and cars in high volume.
Once it was thought to be extinct, slayed forever by the twin forces of fuel economy and exhaust emissions. When it roamed the streets of the Earth, it shook the pavement like no other, leaving great stripes of smoking rubber, quivering competitors and shattered records in its wake.
It was Chrysler’s Hemi, the king of all American muscle car V-8s. The mere sight of its voluptuous valve covers, each sprouting four central spark plug wires, had nearly the same effect on male car enthusiasts as Linda Vaughn in her Hurst T-shirt. The ability to produce mountains of power made the Hemi an icon. And DaimlerChrysler intends to bring it back.
Sources at the automaker and its suppliers confirm that the company will produce an all-new 5.7L (353 cu. in.) ohv Hemi V-8, beginning in late 2001. It will replace the old 5.9L V-8 used in Dodge trucks and the Jeep Grand Cherokee. The reborn Hemi will wear aluminum cylinder heads to reduce mass. It will have two spark plugs per cylinder, to increase flame propagation, speed combustion and reduce emissions. And to boost fuel economy, the engine will feature a cylinder deactivation system for steady-state driving.
Even with its cast-iron cylinder block, the new 5.7L will weigh less and be more compact than the 5.9L. And with just one camshaft (in the cylinder block) and two valves per cylinder, it will handily beat the multicam, multivalve Ford and Toyota truck V-8s on unit cost. In fact, DaimlerChrysler insiders say the pushrod Hemi cost less to develop and produce than the company’s own 4.7L sohc V-8, introduced last year.
The Hemi will be built in DaimlerChrysler’s Saltillo, Mexico, engine plant. Initial volume will approach 300,000 units per year, but that’s expected to rise substantially if North American light truck demand stays high.
The engine isn’t just for trucks. AI has learned that in February, the Hemi V-8 was approved for the rear-wheel drive derivative of the 2004 large sedan (LX-LJ) program. It’s expected to include two famous model names from the Hemi’s glory days: the Dodge Charger and Chrysler 300. The latter will be a successor to today’s fwd 300M sports sedan. It may also spawn a production version of the 300C Hemi roadster concept car introduced at this year’s Detroit auto show.
Power, Simplicity, Low Cost
How did such a seemingly relic engine design get the nod for production in the unleaded, low-emissions 21st century?
"One of the program’s drivers was the desire to have a very high-output engine, without the cost, complexity and mechanical hardware of four-valve engines," explains Floyd Allen, vice president-powertrain product engineering, at DaimlerChrysler’s technical center in Auburn Hills, Mich. "The hemispherical combustion chamber allows us to have two large valves, which give excellent breathing."
If the production engine’s output equals DaimlerChrysler’s claims for the concept engine, it’ll be worthy of its name. The 5.7L in the 300C show car is said to produce one horsepower and one pound-foot of torque per cubic inch. That puts it in Corvette LS1 territory.
Allen, who stressed in an AI interview that the Hemi is still officially a "concept," admits not all of the engine’s emissions work is done. But he seems confident that "with large bore sizes, a piston that has some crown to it and a high compression ratio, dual spark plugs will be a significant advantage" in meeting exhaust standards. We’ll bet that the Hemi’s cylinder heads, like those of the 4.7L Jeep V-8, are configured for future emissions-control hardware such as internal exhaust gas recirculation (EGR), air-assist fuel injectors and possible air injection.
According to Allen, engineers have been "putting ideas into hardware" for over a year. All of the basic head design, CAE and combustion analysis was done in-house. From the very start, the engine was a two-valver and there was no excitement for overhead camshafts. "They add width," Allen reasons, "and we’re trying to give less space for powertrain and more space for occupants."
Allen would only share a few design details. He says the new Hemi has double rocker shafts per head, like its predecessors. But unlike them, the 5.7’s valve gear is fully enclosed within the head walls, hence the shallow valve cover.
The 5.7L won’t have variable valve timing like some of its ohc competitors. Allen did reveal that the cylinder deactivation is handled on the tappet end, not the rocker shaft end – which means it’s a different system than that of Mercedes’ V-8 and V-12.
According to recent reports in our sister publication, American Metal Market, DaimlerChrysler chose a sourcing strategy for the 5.7L based in large part on local Mexico-based vendors. This was for cost and to satisfy local content requirements. The aluminum cylinder heads will be supplied by Nemak SA of Monterrey. Powder-metal (copper-steel) connecting rods are sourced from MascoTech Sintered Components-Mexico. Powder-metal rod bearing caps from GKN Sinter Metals, Inc. And the Hemi’s camshaft is a CWC-Textron piece.
Last month, Hemi V-8s began to spin the new dynamometers in Auburn Hills. Performance testing and rudimentary durability testing were underway. Soon the pavement may shake again.
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jeffster
Dakota Enthusiast
3/30/2001
22:10:59
| RE: 5.7 Hemi article
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Perhaps a new 300+ hp R/T will come of this by 2003 or perhaps very limited 2002??
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Don
Unregistered
3/30/2001
22:13:36
| RE: 5.7 Hemi article
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Hay man is it a true hemi with two rocker shafts or is it a poly-sperical head?
Don O.
1991 ext. cab
Big block.
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Mar
GenI
3/30/2001
22:36:15
| RE: 5.7 Hemi article
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Thats only one of the two hemi engines chrysler is working on. Theres going to be a 5.7 like you said and some other hemi in the 6's somthing like 6.5L and then there new big block not a hemi but it will be the 8.3 L 505 ci. See ya.
MaRty
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95 ram with 348K
Dodge Dakota
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12/11/2002
17:10:33
| RE: 5.7 Hemi article
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Will the new Hemi heads fit my 95 dodge 1500's 360 5.9 block?
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Pistolero
Dodge Dakota
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12/11/2002
20:05:52
| RE: 5.7 Hemi article
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Absolutely not...totally new and different engine design.
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MikeD
*R/T*
12/11/2002
22:24:20
| RE: 5.7 Hemi article
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I'm good friends w/ a guy at a Dodge place here in the Dallas area and he says there has already been 2 new Hemi's in for engine problems...one had problems w/ the rockers, he didn't mention what the other one had. Said the guy had only driven his Ram 2 days when the engine had the problem.
Hope this isn't a problem for all of em.
~Mike~
Get In...Sit Down...Shutup...& Hangon
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Robbie
Dodge Dakota
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12/11/2002
22:33:40
| RE: 5.7 Hemi article
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So basiclly... all of us putting all of our money into mods w/ the 5.9 are wasting our time... lol
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Chipster
Dodge Dakota
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12/11/2002
23:24:25
| RE: 5.7 Hemi article
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Robbie--Not really, it's not all good. If you talk
to the tuners, the horsepower is there. But the
combo is not right. The drive-by-wire system,
won't let you hot rod the Hemi. On the dyno,
the horse power is spiked. As you pedal the
gas, and the engine comes alive, the
drive-by-wire and torque management
system, will start to close the throttle. Not to
good for performance. Don't forget the gas
pedal is not hooked up to the throttle body.
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FRED ZIMMERMAN
Dodge Dakota
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10/13/2003
12:07:24
| RE: 5.7 Hemi article
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I RESCENTLY BOUGHT A 2003 DODGE RAM 2500 HEAVY DUTY TRUCK TO REPLACE MY OLD 92 FORD TRUCK!
I'VE HAD THE TRUCK FOR 2 WEEKS AND IT IS IN THE
SHOP RIGHT NOW WITH NO COMPRESSION ON THE
#4 CYLINDER ! THE TRUCK HAS THE 5.7 LITER HEMI.
IS THERE ANY OTHER PROBLEMS WITH THIS ENGINE
THAT YOU ARE AWARE OF!!
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slow r/t man
Dodge Dakota
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10/15/2003
21:20:15
| RE: 5.7 Hemi article
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Dodge won't put the hemi in a dakota. If they did it would give simaler performance to the SRT Ram and cost 20000 less.
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gen1dak
Dodge Dakota
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10/15/2003
23:40:24
| RE: 5.7 Hemi article
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Nothing like early adopters blues. Even if I could afford one, I'd hold out a couple years on the Hemi. They're bound to have an issue or two.
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slow r/t man
Dodge Dakota
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10/16/2003
13:03:47
| RE: 5.7 Hemi article
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Truer words have never been spoken gen1dak
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Joe Sewell / HemiRam
Dodge Dakota
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10/17/2003
18:22:36
| RE: 5.7 Hemi article
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I work at a dealership in "Sin city" and we have yet to see a Hemi come in the shop for any maintenance, other then an oil change! Also, I recently purchased a 2004 Hemi Ram 1500, 2dr, 2wd. The Mayor has over 2000 HARD miles on it (from full throttle takeoffs at every light, to speeds of 105 (max allowed by the computer) on the highway), twice every weekend back and forth between Vegas and Riverside, Ca. and I have had absolutely no problems with it! This is the best package to come from Chrysler since The Little Red Express in 1978, but it's a Hemi!!
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mark smith
Dodge Dakota
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10/18/2003
18:12:11
| RE: 5.7 Hemi article
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ANY NEWS ON AFTER MARKET PERFORMANCE PARTS FOR THE NEW 5.7 ALSO DUEL PIPES WITHOUT SCREWING UP THE ENGINE
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jeremiah swartz
Dodge Dakota
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10/26/2003
11:35:30
| RE: 5.7 Hemi article
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i own a hemi 4wd i installed gibson cat back instead of 13.5 mpg on hwy i now get 16.3mpg i also installed a kn filter a there is noticeable throlled responice a it is a lot quicker of the line i nhave not put it on a dyno but you can feel the different
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CRUM Style
Dodge Dakota
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10/27/2003
17:24:17
| RE: 5.7 Hemi article
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5.7 HEMI is set for release in 2005 with the generation IV body style similar to the ram. The new truckin has a sneek peek photo of it.
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RAT
Dodge Dakota
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10/28/2003
11:31:32
| RE: 5.7 Hemi article
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I still really wish that they made it a 426. But I am happy to see a new hemi.
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josh
Dodge Dakota
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11/17/2003
00:19:24
| RE: 5.7 Hemi article
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I've got a 2003 4*4 quad cab with the hemi and have had it back to the dealer for a rough idle at startup, it felt like it was going to die. They reprogrammed the computer, but 2 weeks later it is happening again. I put it in drive and it would barely pull its self. I am NOT happy and will get it fixd right or they will give me a new truck to replace mine with just 6000 miles on it.
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HemiHmm
Dodge Dakota
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11/19/2003
21:41:12
| RE: 5.7 Hemi article
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I've read several pieces on the internet about cracked valve springs on the new HEMI's, sounds like that could be a problem with yours. I'd get them checked out.
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Matt George
Dodge Dakota
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12/03/2003
20:06:24
| RE: 5.7 Hemi article
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I've got a 2003 Dodge Ram 2500HD w/ the5.7 Hemi. I heard that Dodge makes a performance chip that does not void your warranty. Is this true? But also i want to get more power out of her, so what should i do about it, without doing exhaust? I really like the way it sounds stock.
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