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Kyle-Cel'02
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Kyle-Cel'02 Feb 5, 8:32am - #398 
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What's a HEMI?

Hey guys, I was just wondering what a HEMI is. Dodge advertises them on their trucks and they seem to provide a good deal of horsepower. What are they?

Kyle-Cel'02
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issachar007
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issachar007 Feb 5, 8:50am - #399 
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HEMI is the name of the engine itself, not a part.
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D Davis
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D Davis Feb 5, 8:51am - #400 
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HEMI stands for Hemispherical - as in the combustion chamber has a hemispherical shape to it. I don't know all the specs, but here's a good place to start:

Classic Hemi

[Linked Image]

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Anonymous Feb 5, 2:38am - #401 
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It has the do with the valves and the flow of air/fuel/exhaust through the head.Basically, the "hemi" head is one of the best flowing designs out there. The closest design to a 'hemi' head would be a Chevy big block head also known as the porcupine head.
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Kyle-Cel'02
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Kyle-Cel'02 Feb 5, 5:54am - #402 
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Oklahoma
Thank you

Kyle-Cel'02
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meacracker13
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meacracker13 Feb 2, 1:46am - #403 

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1968 Plymouth barracuda

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the top of the hemi piston is hemispherical (round). My dad and I are big muscle car fans, since we have a 1968 barracuda, not a hemi though...

here's a pic of the hemi cylinder...
1869805668-hemi.gif
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meacracker13
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meacracker13 Feb 2, 1:48am - #404 

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1968 Plymouth barracuda

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CA,, USA
here's a pic of a hemi engine
this is the old muscle car version, not the same one in the preseent dodge trucks
it's a huge engine
1869805670-hemiengine.jpg
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xmangt1
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xmangt1 Feb 2, 7:59am - #405 

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Good info!
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LinkTallica
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LinkTallica Feb 2, 8:19am - #406 

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Originally Posted by xmangt1
Good info!
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beans
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beans Feb 2, 3:50pm - #407 
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Originally Posted by LinkTallica
Originally Posted by xmangt1
Good info!
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supra_celica
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supra_celica Feb 2, 4:25pm - #408 

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Yeah, great info. What a dead post, though.

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LostAngel
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LostAngel Feb 2, 7:42pm - #409 
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Yeah, but isnt the current hemi a 'pussy' version of the older ones? I know the older ones had a lot more power then the current ones.
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Rave669
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Rave669 Feb 3, 12:29am - #410 

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2002 Toyota Celica

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Lisle, IL
Hell man, just about any engine with a hemisperichal combustion chamber can be called a hemi (a lot of mopar guys would dispute this. however)

My old ford escort had a hemi in it; 1.9L CVH single cam 4 (CVH = Canted valve w/hemispherichal combustion chambers) Benifits of a hemi, efficient fuel consumption combined with good power and torque. also, the valves will flow better when open.

the hemispherical combustion chambers on the cylinder head act sort of like the shaped charges around the core of an old atomic bomb, they direct the force of the combustion towards the center of the piston, rather than across a flat surface. Also, on most HEMI motors, the spark plugs go in at an angle, rather than straight in from the top. When Mopar made the first HEMI's they created something unique, and since then, many engines have adopted a similar design for the combustion chambers.

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RedSunCelica
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RedSunCelica Feb 3, 12:31am - #411 

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San Diego CA
hemi, basically its a kick ass engine. so if your at the drag strip or at a stop light and i guys wants to run and he tells you he only has a hemi... youll get owned.

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LostAngel
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LostAngel Feb 3, 1:40am - #412 
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Originally Posted by RedSunCelica

hemi, basically its a kick ass engine. so if your at the drag strip or at a stop light and i guys wants to run and he tells you he only has a hemi... youll get owned.

thats not completely true...he might have a hemi as in hemroid...then he will get owned! thumbsup
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slidr
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slidr Feb 3, 1:54am - #413 

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Saint Louis, MO
Originally Posted by RedSunCelica
hemi, basically its a kick ass engine. so if your at the drag strip or at a stop light and i guys wants to run and he tells you he only has a hemi... youll get owned.
Any car with a hemi will own you? Hardly. rolleyes

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Anonymous Feb 3, 2:37am - #414 
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my civic hatch will own the hemi. VTEK!!! 4 LYFE!!!
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