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DBLDREW
(Flagger)
Thu May 25, 06   4:53 PM
Re: piston power!

No it is not

The original hemi used an actual hemispherical combustion chamber, as in the dome was an actual Ĺ circle. It also used inline valves rather then valves that where right next to each other along with having a center sparkplug. I know that the inline valves are a little confusing so let me try to elaborate. In a reg motor the intake valve would be closer to the front of the motor and the exhaust would be closer to the back of the motor. Now if you rotate both the intake and exhaust valves 90 deg so the intake valve is now closer to the center or facing the intake maifold and the exhaust is now on the outside or facing the header that is how the hemi is designed.

So the new hemi does use the inline valve design like the original hemi, it now has 2 center located spark plugs rather then just 1 but it does not have a hemispherical combustion chamber like the original hemi.

Ultimately a true hemispherical combustion chamber really isnít that big of a deal. There are a lot of problems with having a true hemispherical combustion chamber. The main problem is compression. A true hemispherical combustion chamber is a very large combustion chamber so to raise the compression ratio there would have to be a very large dome to the piston, which would decrease the efficiency of the motor. You would also be limited to just a 2 valve design, trying to make a 4 valve design in a hemi would be a complete nightmare, the valve angle would be so radical I question if it would even be feasible. Now that being said the hemi was a very good design for forced induction motors where a low compression was needed.


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