[grancuda]

Anyone watch this 30 min advertisement? The Lou character on "Car Fix" briefs everyone on the Challenger they are installing headers on & he says new HEMI isn't a hemi, it's more like a LS arrangement.

Where do these clowns come up with this stuff?

 

[Green Man]

All,

My parts department friend at the Dodge dealer said the Chrysler engineers consulted the original design engineer of the Hemi engine (1950s) for the new Hemi engine. They actually made improvements to the piston/valve designs based on his inputs. That thing still gotta a Hemi, with some improvements.

Green Man

 

[2012R/T]

As far as I know the reason some do not call it a Hemi is because the combustion chamber is not a true hemisphere. The sides of the combustion chambers are squeezed in a little. The guy from Carfix said it is more like a ball hemi, from the 70's. Does not matter to me, it has a Hemi.

 

[Trimec]

Never really could stomach that show, probably from dumb tibit remarks like that.....

 

[teddyp]

I'm not one for names only, however call my 392 anything you want. If you have a car TV show you can call it a piece of crap if you'd like. Reason is, my 392 kicks ass and I love it.

 

[ViperTomcat]

Whenever a Mopar Hemi engine gets a lot of attention, be it the Hellcat, the 392 or the 5.7 this crap gets trotted out. I know I am speaking in broad terms but generally I have found that it's the people who feel threatened, personally for some reason, by new engines. They seem to follow in the following categories:
1: Chevrolet or Ford brand loyalists and fanatics.

2: First and second generation Hemi owners who are offended that an affordable Hemi engine is available to the general public and can buy into the "elite".

3: Technological dinosaurs who believe that v8s should all still be related to the RB, Commando and Magnum series.

Does it shares some technical similarities to the Chevrolet LS generation of motors? Perhaps, but that isn't a bad thing, the LS motors are extremely impressive powerplants.
Do the Gen III Hemi Motors have absolutely strict hemisphere chambers? No, they have a modified hemispherical combustion chamber optimized for fuel burn and exhaust flow. They still utilize 2 plugs per cylinder and share many other design elements with the elephant motor.

The motors are an improved, updated, refined and worthy successor to the Hemi name. Is it a slavish downsizing of the 426? of course not, it would be down on power and wouldn't pass economy even if it was.

Consider this:
the new 392 for the 2015 model year is down only 20 horsepower from the LS7 with over a half liter deficit, that says a lot about the new Hemi

 

[Bad daytona]

If you look at the pic,it is clearly a hemispherical combustion chamber,the Only difference is the quench area.What makes the Hemi is the canted valves and their position for better flow.I'm not sure,but just guessing,the reason for the quench is the flat top pistons.The gen 1 and 2 had dome pistons that filled the combustion chamber.

 

[dodgeboy77]

Are the new engines 'true', 'pure' hemispherical combustion chambers as in the 1957 392? No. But they're close enough for me and they sure aren't wedges, pent roofs or polyspheres. Plus, they have to have the same difficult valve train geometry as all the rest of the Hemi's.

Bill

 

[Danner]

Everybody knows the modern HEMI® does not have hemispherical combustion chambers.

So, move along, there's nothing to see here.

 

[teddyp]

If you look at the pic,it is clearly a hemispherical combustion chamber,the Only difference is the quench area.What makes the Hemi is the canted valves and their position for better flow.I'm not sure,but just guessing,the reason for the quench is the flat top pistons.The gen 1 and 2 had dome pistons that filled the combustion chamber.

"...and a picture is worth a thousand words." Thanks Bad Daytona.

 

[aldo90731]

Right. And the BMW 335i doesn't have a 3.5 engine, and the Coyote engine is not made out of wild canines.

HEMI is a name with strong heritage, marketing equity, and the current HEMIs are worthy of the name.

Ford and Chevy people: either build your own heritage, or get over it!

 

[Bad daytona]

Here's another pic. This is an LS head.Notice that the the combustion chamber is relatively flat,and also the valves are flat,no canter.The LS heads have a side by side valve arrangement,like allmost all non Hemi heads.All Hemi heads old or new,the valves on the intake port and the exhaust ports are in alignment,straight across.How anyone can say their like an LS head is beyond me.
It's like when the B1 heads came out and started kicking tail,everyone was saying it was a copy of the BB Chevy head,when clearly the exhaust port arrangement was not similar.

 

[SlowSRT8]

That looks more like a twisted wedge head design to me...


Sent from AutoGuide.com App

 

[Bad daytona]

That looks more like a twisted wedge head design to me...


Sent from AutoGuide.com App

Now that you mention it.It does look like the 66 67 closed chamber heads with a twist.

 

[Toxic11]

*Photo Courtesy of Andy from PWR Performance*

This is a close up of an Apache Hemi Head.


This is the definition of Hemisphere:

hemi·sphere

noun \ˈhe-mə-ˌsfir\ : a half of the Earth
: half of a sphere : half of a round object
: either of the two halves of the brain





Full Definition of HEMISPHERE

Hemisphere - Definition and More from the Free Merriam-Webster Dictionary

1
a : a half of the celestial sphere as divided into two halves by the horizon, the celestial equator, or the ecliptic
b : half of a spherical or roughly spherical body (as a planet); specifically : the northern or southern half of the earth as divided by the equator or the eastern or western half as divided by a meridian

 

[Bad daytona]

And what an engineering work of art it is.

 

[SlowSRT8]

Now that you mention it.It does look like the 66 67 closed chamber heads with a twist.

Yep..


Sent from AutoGuide.com App

 

[BlkSEbase]

It's a real HEMI. E... O... S..... :deadhorse:

 

[teddyp]

And another photo, this one by Toxic11, that speaks volumes.

 

[Mr.Wilson392]

All I would say to Lou is... https://www.youtube.com/watch?v=jylTSfjv8Kk