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Old 05-14-2008, 02:42 PM
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hemi

wat is so special about the hemi?

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Old 05-14-2008, 02:46 PM
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Hemispherical combustion chambers. causes a more efficent burn, compared to a more conventional wedge combustion chamber design
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Old 05-14-2008, 02:47 PM
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k can u get that disign on gm engines like a sbc
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Old 05-14-2008, 03:07 PM
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Quote:
Originally Posted by Thumper_Pumper
k can u get that disign on gm engines like a sbc
Mopar is the only 1.
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Old 05-14-2008, 03:30 PM
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unless you have bbc and buy arias heads
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Old 05-14-2008, 03:44 PM
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Actually someone out there IS making hemi heads for the SBC. I think they're around $7000 (bare). Of course, why would anyone want a copy when, if they buy Mopar, they can have the real thing. Makes no sense to me. Oh well, imitation is the best complement in the world I guess.
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Old 05-14-2008, 03:45 PM
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1968 Camaro Z/28 with a Chevrolet Engineering Built, 302 Cubic Inch, semi-hemispherical head prototype engine, This includes correct prototype aluminum Cross Ram intake, prototype air cleaner, prototype Holley carbs, prototype cam, lifter, and valves, prototype valve covers, and prototype exhaust headers

I understand that GM had a prototype
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Old 05-14-2008, 04:40 PM
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"semi-hemispherical"......???

Oh, is that right...That would make it like the "new" HEMI....................
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Old 05-14-2008, 05:02 PM
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Quote:
Originally Posted by poncho62
"semi-hemispherical"......???

Oh, is that right...That would make it like the "new" HEMI....................
Oh you non hemi guys!!! Just because you don't own one or drive one and you're jelous of those that do you have to mock the great hemi. Shame on you! The new hemi IS a hemi with some minor combustion chamber modifications to meet emissions regulations. Something every manufacturer is guilty of. So there.

By the way... I think Chrysler came out with their hemi prototype around 1950.
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Old 05-14-2008, 05:43 PM
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re;hemi

Quote:
Originally Posted by Centerline
Oh you non hemi guys!!! Just because you don't own one or drive one and you're jelous of those that do you have to mock the great hemi. Shame on you! The new hemi IS a hemi with some minor combustion chamber modifications to meet emissions regulations. Something every manufacturer is guilty of. So there.

By the way... I think Chrysler came out with their hemi prototype around 1950.
Actually, I believe you could get a 1949 Imperial with a hemi!
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Old 05-14-2008, 06:26 PM
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Quote:
Originally Posted by sprecher48

Actually, I believe you could get a 1949 Imperial with a hemi!
Not so. The 1949 Imperials (all 135 of them) had the inline "L" head straight eight. Chrysler's first hemi prototype was in 1947 and was the "A 161" an experimental 6 cylinder. The next year (1948) they produced their first V8 prototype the "A 182" 330 cu. in. Followed later that year by the "A 239" 331 cu. in. prototype. After 2 1/2 years of testing the first production Chrysler hemi (331 cu. in,) was produced in 1951.

The hemi cylinder heads were based on a Healey design that Chrysler had been working on (for tank and aircraft engines) during WWII. For the record, Chrysler did not come up with the hemispheric head design. It's been around since the very early 1920's and was used in European racing engines for years.
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Old 05-14-2008, 08:45 PM
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some interesting Hemi-history

http://fourwheeldrift.wordpress.com/...ed-challenger/
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Old 05-14-2008, 10:41 PM
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Pratt & Whitney beat Chrysler in the Hemi head design.

Vince
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Old 05-15-2008, 12:28 AM
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Quote:
Originally Posted by scrimshaw
Interesting article but I disagree with his assertion that the new hemi isn't really a hemi. None of the hemi engines ever built by anyone were "real" hemis since NONE had a combustion chamber that was a true hemisphere (or half a ball). They have all been sections of a hemisphere. As an example, below are two hemispherical combustion chamber heads. the first is the "new" hemi and the second is a set of early hemi heads. The combustion chambers are almost identical with the differences being the squish pads in the new heads for emissions and the dual spark plugs.



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Old 05-15-2008, 03:02 AM
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Here is a real good Hemi Site with info on all the Hemi Engine's http://www.thehemi.com/engines.php It's also Posted in are Shade Tree Tech Library
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