A Hemi indicates the top of the combustion chamber has a Hemispherical shape, rather than the typical frying pan type shape.
The increased size of the chamber means additional fuel and air can be introduced, which increases power output.
It's old tech like carburetors. It's wasteful on fuel, but MOPAR fans love it.
Doesn't it also mean a higher compression ratio? Meaning more power behind the same A:F ratio? Or am I as dumb as the guy who put the stickers on that truck?
"Due to the shape of the hemispherical combustion chamber, it's difficult to raise the compression ratio high enough to fully take advantage of its superior shape, irrespective of the brand on the valve cover"
"If the 2003-present Gen-III Hemi isn't a real hemi engine, then why do we call it that? With good reason, Chrysler (now FCA) wanted to extend the "Hemi" branding to its third-generation Hemi V-8 because of the instant recognition and status it carries."
A Hemi indicates the top of the combustion chamber has a Hemispherical shape, rather than the typical frying pan type shape.
The increased size of the chamber means additional fuel and air can be introduced, which increases power output.
It's old tech like carburetors. It's wasteful on fuel, but MOPAR fans love it.
Doesn't it also mean a higher compression ratio? Meaning more power behind the same A:F ratio? Or am I as dumb as the guy who put the stickers on that truck?
"Due to the shape of the hemispherical combustion chamber, it's difficult to raise the compression ratio high enough to fully take advantage of its superior shape, irrespective of the brand on the valve cover"
https://www.motortrend.com/how-to/hemi-engine-pros-cons/
This is also interesting:
"If the 2003-present Gen-III Hemi isn't a real hemi engine, then why do we call it that? With good reason, Chrysler (now FCA) wanted to extend the "Hemi" branding to its third-generation Hemi V-8 because of the instant recognition and status it carries."