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Name Roger
Email Address private
Personal Quote
Privileges Normal user
Points 355
Number of Posts 40
Number of Reviews 21
Date Joined Mar 1, 2005
Date Last Access Jun 23, 2006 5:57 pm
Roger's last  
Compact Digital Cameras
#1   Jun 22, 2006 7:49 pm
Anyone have any thoughts on the best entry level compact digital camera? I just got a Cannon PowerShot A530 and I like it well enough except that it is a bit big to keep in your pocket.
Re: Yankee Test
#2   Sep 12, 2005 4:11 pm
48% bairly a yankee
Motorcycle Site Is Up
#3   Sep 12, 2005 3:56 pm
Hey Guys,

Your request for a Abby's Guide for Motorcycles is up! If you own a bike please post a review with a pic!

Re: That thing got a Hemi????
#4   Jul 20, 2005 12:30 am
Majorxlr8n wrote:
The word HEMI is actually short for hemispherical. In a piston engine, the area from the top of the piston to the top of the cylinder head by the valve heads is known as the combustion chamber (this is actually just an area of air!). The combustion chamber on most overhead valved AUTOMOTIVE engines are either wedge shaped (think of a piece of pie) or hemispherical (think of tennis ball cut in half). The cylinder head design dictates the combustion area shape, so when someone says &quot;hemi&quot;, it really only refers to the engine's cylinder head having a hemispherically shaped combustion chamber. <p>Hemi heads have the spark plug located at dead center of the combustion chamber, which makes for an extremely efficient &amp; powerful fuel/air mixing &amp; flame burn (actual igniting of the fuel/air). Hemi heads also have ideal valve placement to help the flow of air (intake &amp; exhaust) through the cylinder head. In simple terms, the head design is VERY efficient, and allows an engine to make excellent power! On the downside, hemi heads themselves usually are quite heavy &amp; large, and valvetrains can be somewhat complex (read: expensive).</p><p>Wedge shaped combustion chambers are what most OPE engines have, as do most automotive engines. The &quot;wedge&quot; shape by design, is not as efficient as a &quot;hemi&quot; due to all the sharp angles that are present, which creates turbulance. The valve placement &amp; spark plug location are less than ideal also. Cost was a big factor that lead to the wedge design. However, a wedge chamber CAN be modified to produce very impressive burn &amp; airflow rates - having said that, IMHO all this &quot;HEMI&quot; talk (car &amp; truck commercials) as of late really doesn't impress me personally. Chrysler/Daimler is really getting a lot of hype &amp; sales out of it though...</p><p>There is another variation of head called a semi-hemi, but it is not widely used. It is actually a cross between a wedge &amp; hemi shaped combustion chambers.</p><p>Marty <img alt="" src="/components/FCKeditor/editor/images/smiley/msn/shades_smile.gif"/>

Great response! Thanks!!!
What is a hemi?
#5   Jul 16, 2005 11:30 pm
For those of us who are ignorant, could someone please define what a hemi is and does.


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