HELP deciding which ZJ to buy 2001 4.7L Limited or 2004 4.0L Laredo, more inside

Bill you lost me, Hemi?? I thought that was only coming for the 2005 model year.

Cheers,

... Hemi Grand SRT. 425 hp and 4wd. [autoweek]

L.W.(ßill) Hughes III proclaimed:

The current incarnation has nothing much more than the name in common with the ancestral block.

L.W.(ßill) Hughes III proclaimed:

So you didn't know about the hemispherical combustion chamber that both engines have? Today's Hemi is just a more modern version of the Hemi of the

Jerry

What the modern "hemi" has in common with the older hemispherical chamber'd mopars is the name...a very valuable name, becoming a brand name all of its own. And yes, I know the difference between a wedge head, a ram head, a hemi head, etc. etc. etc. 'twas a DC person who made the statement that the new hemi [which has far more actual horsepower per cube] pays homage to the older generation but is not a descendent.

Jerry Bransford proclaimed:

I can remember a few hemi's up around Grand Junction, Moab, etc. that displayed the legendary performance. All were in dealer hands and never did see one on the streets. Most of the nutcases tended to run the ram 426 on the street--easier to keep in one piece. Of course one of my ex-cow orkers had a Keith Black 426 ram with B&M hydro and used it to commute between Moab and Green River to work....you could watch the gas guage creep downwards on the highway.

L.W.(ßill) Hughes III proclaimed:

Yes, I assume that was said in reference to the fact that the new "Hemi" is hemispherical on one axis and squished in on the sides. Not even remotely like the heads of the originals. Maybe it should have been called the open-on-the-bottom-taco head. When it came out some criticized the "Hemi" name as pure marketing.

-John

See link.

"...There is also a little problem called "flame quench" (which causes additional NOx) with a true Hemi design, as was used on the V16 aircraft engine and the automotive engines produced in the 1950s. Today's Hemi is that (a "Hemi") in name only. [Editor's note: Bob is referring to the head design. It is not a true hemispherical head, but looks vaguely like a hemispherical head with parts filled in.]"

Here's a nice photo of the new head and the oval or squished in "Hemi."

-John

The two plugs are explained in the allpar.com article:

"Dual spark plugs per cylinder ensure consistent, complete and rapid combustion, without knock, that increases peak power and torque, reduces exhaust emissions and increases fuel efficiency. It even smoothes the engine's idle. The 5.7 delivers an 8-10 percent better fuel efficiency than the less-powerful 5.9."

-John

Generic proclaimed:

As does the Road & Track supplement on the Chrysler 300C that subscribers got.

Drag engine? My dad's old 1936 Nash Ambassador straight eight had twin plug ignition...

L.W.(ßill) Hughes III proclaimed: