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Is the "Modern Hemi" really a hemi?
#1663670
08/25/14 11:12 PM
08/25/14 11:12 PM
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Joined: May 2011
Posts: 220
Aurora, CO
jbeintherockies
OP
enthusiast
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OP
enthusiast
Joined: May 2011
Posts: 220
Aurora, CO
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Simple question: is the new Hemi engine currently produced by Chrysler/Dodge and put into Challengers, Chargers, Rams, etc, really a "hemi" engine? I was at a Mopar car show a few weeks ago in Fort Collins, CO. At the show they had a modern Hemi cylinder head and a 1964-1971 style Hemi cylinder head next to one another. The older style head had a hemispherical combustion chamber; no question. The modern hemi head, however, appeared to be a cross between a hemispherical combustion chamber and a wedge (ie, had what appeared to be quench pads). It is the existence of what appeared to be quench pads that made me wonder if it really is a "hemi" head. Is it?  Sorry if this topic has been beaten to death. I don't recall seeing a post on the subject and searching the forum for "hemi" produces a lot of hits.
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Re: Is the "Modern Hemi" really a hemi?
[Re: jbeintherockies]
#1663672
08/25/14 11:54 PM
08/25/14 11:54 PM
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Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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No any modern automotive engineer would describe the gen3 hemi head as a pent roof design.....
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: Is the "Modern Hemi" really a hemi?
[Re: HemiRick]
#1663673
08/26/14 12:06 AM
08/26/14 12:06 AM
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Joined: Jan 2012
Posts: 2,646
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,646
Stuttgart, Arkansas
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They are all Hemis. Just a little different. The gen 3 has the best looking combustion chamber I've ever seen,.
2011 Drag Pak Challenger
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Re: Is the "Modern Hemi" really a hemi?
[Re: jbeintherockies]
#1663678
08/26/14 08:24 PM
08/26/14 08:24 PM
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Joined: Jan 2003
Posts: 581
Detroit, MI
David Hakim
super street
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super street
Joined: Jan 2003
Posts: 581
Detroit, MI
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Quote:
Simple question: is the new Hemi engine currently produced by Chrysler/Dodge and put into Challengers, Chargers, Rams, etc, really a "hemi" engine?
I was at a Mopar car show a few weeks ago in Fort Collins, CO. At the show they had a modern Hemi cylinder head and a 1964-1971 style Hemi cylinder head next to one another. The older style head had a hemispherical combustion chamber; no question. The modern hemi head, however, appeared to be a cross between a hemispherical combustion chamber and a wedge (ie, had what appeared to be quench pads).
It is the existence of what appeared to be quench pads that made me wonder if it really is a "hemi" head. Is it?
Sorry if this topic has been beaten to death. I don't recall seeing a post on the subject and searching the forum for "hemi" produces a lot of hits.
OMG - Not this again!
To quote Tom Hoover, Godfather of the 426 HEMI, "the current HEMI is a HEMI and the folks that don't think so don't know what they're talking about!"
Go
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Re: Is the "Modern Hemi" really a hemi?
[Re: David Hakim]
#1663679
08/26/14 08:26 PM
08/26/14 08:26 PM
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Joined: Aug 2003
Posts: 18,575
Dreaming of the 808
AZ_A12_BEE
I Live Here
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I Live Here
Joined: Aug 2003
Posts: 18,575
Dreaming of the 808
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Quote:
Quote:
Simple question: is the new Hemi engine currently produced by Chrysler/Dodge and put into Challengers, Chargers, Rams, etc, really a "hemi" engine?
I was at a Mopar car show a few weeks ago in Fort Collins, CO. At the show they had a modern Hemi cylinder head and a 1964-1971 style Hemi cylinder head next to one another. The older style head had a hemispherical combustion chamber; no question. The modern hemi head, however, appeared to be a cross between a hemispherical combustion chamber and a wedge (ie, had what appeared to be quench pads).
It is the existence of what appeared to be quench pads that made me wonder if it really is a "hemi" head. Is it?
Sorry if this topic has been beaten to death. I don't recall seeing a post on the subject and searching the forum for "hemi" produces a lot of hits.
OMG - Not this again!
To quote Tom Hoover, Godfather of the 426 HEMI, "the current HEMI is a HEMI and the folks that don't think so don't know what they're talking about!"
Go
That's good enough for me
69.5 A12 Bee, first purchased in 1976, car 169 on registry
69 Coronet R/T 440/4 spd
69 Coronet 500 Conv H code 383 4bbl/auto
37 Plymouth PU
Find your spot on earth and ride it.
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Re: Is the "Modern Hemi" really a hemi?
[Re: David Hakim]
#1663680
08/26/14 08:59 PM
08/26/14 08:59 PM
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Joined: Jan 2003
Posts: 581
Detroit, MI
David Hakim
super street
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super street
Joined: Jan 2003
Posts: 581
Detroit, MI
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Quote:
Quote:
Simple question: is the new Hemi engine currently produced by Chrysler/Dodge and put into Challengers, Chargers, Rams, etc, really a "hemi" engine?
I was at a Mopar car show a few weeks ago in Fort Collins, CO. At the show they had a modern Hemi cylinder head and a 1964-1971 style Hemi cylinder head next to one another. The older style head had a hemispherical combustion chamber; no question. The modern hemi head, however, appeared to be a cross between a hemispherical combustion chamber and a wedge (ie, had what appeared to be quench pads).
It is the existence of what appeared to be quench pads that made me wonder if it really is a "hemi" head. Is it?
Sorry if this topic has been beaten to death. I don't recall seeing a post on the subject and searching the forum for "hemi" produces a lot of hits.
OMG - Not this again!
To quote Tom Hoover, Godfather of the 426 HEMI, "the current HEMI is a HEMI and the folks that don't think so don't know what they're talking about!"
BTW, Mr. Hoover had input with the Chrysler engineers when the GENIII HEMI was being developed around 2003.
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Re: Is the "Modern Hemi" really a hemi?
[Re: babarracuda]
#1663682
08/27/14 06:59 PM
08/27/14 06:59 PM
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Joined: Jan 2003
Posts: 581
Detroit, MI
David Hakim
super street
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super street
Joined: Jan 2003
Posts: 581
Detroit, MI
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Quote:
Chrysler trade marked the name hemi so other manufacturers can't use it to describe their engines
Yes and thank God.
Mopar exec Joe Hilger had the foresight to get with the Chrysler patent/trademark attorneys in the 1990s and make it happen.
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Re: Is the "Modern Hemi" really a hemi?
[Re: Sxrxrnr]
#1663685
08/28/14 01:42 PM
08/28/14 01:42 PM
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Joined: Apr 2005
Posts: 178
Tidewater, VA
TMCCuda
member
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member
Joined: Apr 2005
Posts: 178
Tidewater, VA
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The only people that care about this are those that ain't got one. Hemi Envy that's all.
1970 Plymouth Barracuda
1994 Ram 1500 4x4 5.2L
2004 Ram 1500 4x4 5.7L Quad Cab
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Re: Is the "Modern Hemi" really a hemi?
[Re: TMCCuda]
#1663686
08/28/14 01:47 PM
08/28/14 01:47 PM
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Joined: Jan 2003
Posts: 6,018
Morningside
AdventurerSport
waaaay out there in left field
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waaaay out there in left field
Joined: Jan 2003
Posts: 6,018
Morningside
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Quote:
The only people that care about this are those that ain't got one. Hemi Envy that's all.
Bingo! I've got two 5.7L Hemis and I love both of them! 
IIRC the '50s "Hemi" V8s by Chrysler/Dodge/DeSoto had the "most" hemispherical heads, later refined by Tom Hoover and those engineers to become the 426 Hemi in 66-71, and refined even farther (modernized) to become the 5.7/6.1/6.2/6.4L Hemi engines of today.
5.7L Hemi...not perfectly hemispherical combustion chambers, but still a GREAT engine for what it is. I wouldn't buy a new Mopar without a Hemi (in the models that have it available, that is).
JS
76 Dodge Adventurer Sport Power Wagon W100 318, 727, NP203 Fulltime 4x4 Russet Red
06 Jeep Commander Ltd 4x4, 5.7L Hemi, QuadraDrive II
06 Chrysler 300C AWD 5.7L Hemi
10 Mopar 10 Challenger R/T, #483/500, 5.7L HEMI
10 Jeep Grand Cherokee Ltd 4x4 5.7L HEMI
11 Dodge Ram 1500 LoneStar Quad Cab, 5.7L HEMI, Fulltime 4x4, Deep Cherry Red
16 Jeep Cherokee Limited 3.2L Pentastar V6, 9 Speed Torqueflite, 4x4, Black
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Re: Is the "Modern Hemi" really a hemi?
[Re: jbeintherockies]
#1663687
08/28/14 02:08 PM
08/28/14 02:08 PM
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Joined: Feb 2003
Posts: 18,263
Charlotte, NC
Orange_Crush
Belieber!
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Belieber!
Joined: Feb 2003
Posts: 18,263
Charlotte, NC
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"Hemi" is a trademark owned by Chrysler Corporation (now by FCA) so, technically, ANY engine they produce could be branded a "Hemi" (as evidenced by the 2.6 Mitsu "Hemis" from the eighties.
What makes a "Hemi" a "Hemi" is not just the domed combustion chamber. The (arguaby) most important feature of the "Hemi" head is the opposed arrangement of the intake and exhaust valves which allows for larger valves and straighter (and larger) ports which give the Hemi a clear advantage in high RPM horsepower.
The addition of the quench areas and twin plugs address the low-end deficiencies of the old hemis (remember that, stock for stock, the six pack engines could, and often did, embarrass the mighty Hemi.
So, in conclusion. The Hemi combustion chamber isn't (and has never been) truly hemispherical. But this engine shares the most import aspect of the old Hemi's design. Is it a Hemi? Chrysler says it is...and since they own the trademark, well...who am I to argue?
Last edited by Orange_Crush; 08/28/14 02:09 PM.
1970 Dodge Charger R/T Hemi Orange U-code 4-speed
1971 Jaguar E-Type Series 3 V-12 4-speed 2+2 Signal Red.
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None of the Hemi's were actually half a sphere.
