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Old 08-01-2013, 01:46 PM   #1
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Are the new hemis real?

Some people tell me that my 5.7 Hemi is not a Hemi at all? I don't know enough about the original Hemi motor to argue. Can anyone give me some ammunition to throw back at the Hemi Haters? I are sad

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Old 08-01-2013, 04:34 PM   #2
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HEMI.....yes, same as the popular 426......don't think so. I think our HEMI's are more like the early ones and not like the 426's for the late 60's early 70's. I could be wrong though.
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Old 08-01-2013, 05:42 PM   #3
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They ate hemi engines just not the same the old hemi got its name from the hemispherical combustion chamber in te cylinder head the new eng is kida like that with a small bump in it for emission reasons so technically its non longer a hemi persay but its the same in that its a Chrysler hemi if that makes sense
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Old 08-01-2013, 08:57 PM   #4
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Main difference is the new Hemi vs the old Hemi - More hp per sq inch....the new (09+) one is a 345 making 390 hp. Old 426 was 425 hp. Here's a good write up on the old Hemi....Mopar - Chrysler 426 Hemi engine
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Old 08-03-2013, 01:03 AM   #5
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The overall general shape and more to the point the cylinder head layout/architecture (dual rocker shafts with opposed valves) is similar to the previous versions. Even the 2G wasn't as hemispherical as the 50's version. Early 331's were marketed as the Chrysler 'dual rocker shaft' engine before 'Chrysler Firepower Hemi' got used. As stated, the chamber had to be modified for emissions. So yes and no lol.
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Old 08-03-2013, 01:42 AM   #6
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Funny thing is, none of them are the same as the Original, which was introduced during WWII in one of our fighter planes to try and make more power for it....can you guess which one?
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Old 08-03-2013, 05:04 PM   #7
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Inverted hemi prototyped in a P-47, never made it to production. It was liquid cooled, which allowed for a more aerodynamic nose and allowed the test Thunderbolt to go faster than any previous P-47 had.
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Old 08-03-2013, 07:20 PM   #8
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Google FTW. Lol
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Old 08-04-2013, 06:42 PM   #9
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Here's a comparison between the Gen III combustion chamber and the Gen II 426 combustion chamber. The squish areas to the sides of the Gen III were added for emissions purposes I believe. One of the basic parts of the Hemi design is the opposed valves, intake opposite exhaust. Both Gen II and Gen III have that. The Gen III isn't a pure hemisphere due to the squish areas. But it is close enough for me and it breathes very well.
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File Type: jpg 426 Hemi combustion chamber.jpg (53.2 KB, 88 views)
File Type: jpg 5.7-head.jpg (18.4 KB, 5 views)
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Old 08-04-2013, 07:49 PM   #10
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That's exactly it helps to disturb the airflow a little meaning better combustion mixture
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