Re: Hemi advantages
- From: "Bret Ludwig" <bretldwig@xxxxxxxxx>
- Date: 29 Oct 2005 14:20:47 -0700
SCOBO wrote:
> Heat being absorbed from the combustion chamber does hurt power, and
> in this a Hemi is worse than a wedge style chamber , look at the
> surface area of half a ball compared to a flat circle. Hemi is just a
> come-on based on the past. Hemi isn't all that when it comes to
> breathing, which is where the power is made. Racing engines rarely if
> ever use that old design anymore.
Hemispherical heads were actually once quite common. Most of the old
air cooled radial aeroengines were hemi's and so were many motorcycle
engines and many car engines including the lovable but slothful
Citroens, many Japanese fours, the Jaguar XJ six, and several others.
There was nothing particularly great about the Chrysler Hemis-the old
ones in Chryslers, Dodges and DeSotos were unbelievably heavy, and the
vaunted Race Hemis were poor street engines that inevitably died young
in marine or Autobahn applications.
What really killed the Hemi design was multiple valve heads, any
serious engine today has 4 or more valves per cylinder if performance
is the design goal.
.
- References:
- Hemi advantages
- From: Don Stauffer
- Hemi advantages
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