hemi question

Discussion about the Hemi in general.

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bls
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hemi question

Post by bls » Wed Aug 06, 2003 10:45 pm

hey, im just getting into cars and i had a question. am i correct that the hemi's heads are shaped like a half of a ball?....and if i am are the pistons any different from a regular engine?


P.S.- like i said before...im just getting into cars so if i used anything in the wrong context please bear with me :oops:

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centerline
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Post by centerline » Thu Aug 07, 2003 6:06 am

You are basically correct. The combustion chambers are hemispherical or in other words pretty much shaped like half of a sphere. Piston shape depends on compression ratio and can be anything from flat top to hemispherical. The more hemispherical the piston is the bigger the valve relief cuts will be making it look like it has flat surfaces on each side of the top. This is done because the dome on high compression pistons will come very close to the valves when the piston is at the top of its stroke and must be relieved to ensure the valves won't hit the piston when they're open.

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scottm
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Post by scottm » Thu Aug 07, 2003 7:45 am

You can see the hemispherical heads in this picture:

Image

Compared with, say, the Ford 289 cylinder head:

Image

When you see them both, you can see the difference.
Scott Moseman
http://www.TheHEMI.com/
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bls
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Post by bls » Thu Aug 07, 2003 10:29 am

ok, thanks. i think i understand it now

MG42pillbox
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Post by MG42pillbox » Thu Aug 07, 2003 9:15 pm

whats the Mopar (Rip off) ford fake hemi head look like.?
One whose life is Infecting others with Falsehood, shall fall greater than any of their Victims.

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scottm
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Post by scottm » Thu Aug 07, 2003 9:37 pm

Here is Ford's Boss 429 "Hemi" chamber:

Image

Here's a chamber from the Dodge 5.7L Hemi:

Image

Not the best pictures, but they show the idea.
Scott Moseman
http://www.TheHEMI.com/
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MG42pillbox
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Post by MG42pillbox » Thu Aug 07, 2003 11:22 pm

:roll: ford trash,
One whose life is Infecting others with Falsehood, shall fall greater than any of their Victims.

Hemi_is_God
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Post by Hemi_is_God » Wed Jan 14, 2004 1:02 am

yea ford's so lame.... eff those guys....
Any man that does not get wood at the sight of a Hemi is a dirty queer and ought to be shot.

crash
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Post by crash » Thu Jan 15, 2004 12:55 am

too bad there don't make heads like those for my 360 :cry: :cry:

or could they? :lol:

dodgedifferent2
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Post by dodgedifferent2 » Thu Jan 15, 2004 9:03 am

they do make HEMI heads for your 360!!!!!!!!! but u will have to pay almost 10,000 for them...i dont know the websit at the moment but wen i do find it i will post it

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scottm
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Post by scottm » Thu Jan 15, 2004 9:26 am

318/340/360 Hemi Head Conversion
http://www.thehemi.com/news.php?id=20030801-1

The projected price, they say, will be $8000.
Scott Moseman
http://www.TheHEMI.com/
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crash
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Post by crash » Thu Jan 15, 2004 6:04 pm

wooooooooooow :D
man all i need to do is win the lato :cry:
maybe when i get a good job, because lord know a student can't aford this!

how old is this?
have they got the roller and intake ready?



also with me it would probibly go up to 12k :oops:
I like to spend, but im trying to cut back :lol:

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