Posted by Indiana Ken on January 06, 2014 at 16:53:59 from (66.249.234.135):
In Reply to: HP vs Cu. In. posted by Texasmark1 on January 06, 2014 at 14:04:46:
Quoting Removed, click Modern View to see
In answer to your question: The early engines lacked cylinder pressure.
I like to look at it this way;
HP = (BMEP x Cu In x RPM) / 792,000
BMEP is called, Brake Mean Effective Pressure. This is defined as, the average pressure which if it existed in the cylinder would produce the HP as measured on a Dynamometer.
From the equation we can see to increase the HP we need to increase: the BMEP (cylinder pressure) and/or, Cu In and/or RPM. The Ford Eco-boost is one example of a modern engine by makes use of cylinder pressure to produce power and torque.
See BuickandDeere's post for many of the changes in modern engines to increase BMEP while allowing the engines to be driveable in every day use.
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