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

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



"L.W. (ßill) ------ III" <----------@cox.net> wrote in message
news:412197A6.6C32E49E@cox.net...
> The picture of the chamber is using two spark plugs like for a Drag
> engine. The new Hemi uses that area for the electronic injection. But,
> adding a deck level areas, is a good thing, Chevy uses them, and the
> Ford engines I raced, when ported. polished, relieved, and CC, that area
> was left with a sharp edge, for some trick stuff that worked for me.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > See link.
> >
> > http://www.allpar.com/mopar/new-mopar-hemi.html
> >
> > There's a quote half way down, copied here for your convenience:
> >
> > "...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."
> >
> > http://www.popularhotrodding.com/tech/0403phr_hemi/
> >
> > These pages have a lot of other good info.
> >
> > -John

Re: HELP deciding which ZJ to buy 2001 4.7L Limited or 20044.0LLaredo, more inside
 

Except what's in the car is electronic cylinder injection:
http://www.----------.com/hemi_cutaway.jpg And on friend's truck:
http://members.aol.com/FranAngRenteria/frankRam.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> 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

Re: HELP deciding which ZJ to buy 2001 4.7L Limited or 20044.0LLaredo, more inside
 

Except what's in the car is electronic cylinder injection:
http://www.----------.com/hemi_cutaway.jpg And on friend's truck:
http://members.aol.com/FranAngRenteria/frankRam.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> 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

Re: HELP deciding which ZJ to buy 2001 4.7L Limited or 20044.0LLaredo, more inside
 

Except what's in the car is electronic cylinder injection:
http://www.----------.com/hemi_cutaway.jpg And on friend's truck:
http://members.aol.com/FranAngRenteria/frankRam.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> 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

Re: HELP deciding which ZJ to buy 2001 4.7L Limited or 20044.0LLaredo, more inside
 

Except what's in the car is electronic cylinder injection:
http://www.----------.com/hemi_cutaway.jpg And on friend's truck:
http://members.aol.com/FranAngRenteria/frankRam.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> 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

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

Generic proclaimed:

> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...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."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John
>

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

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

Generic proclaimed:

> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...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."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John
>

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

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

Generic proclaimed:

> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...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."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John
>

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

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

Generic proclaimed:

> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...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."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John
>

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

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

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

L.W.(ßill) ------ III proclaimed:

> The picture of the chamber is using two spark plugs like for a Drag
> engine. The new Hemi uses that area for the electronic injection. But,
> adding a deck level areas, is a good thing, Chevy uses them, and the
> Ford engines I raced, when ported. polished, relieved, and CC, that area
> was left with a sharp edge, for some trick stuff that worked for me.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
>