Re: 4020 engine torque??

Posted by buickanddeere on December 29, 2006 at 00:43:08 from (209.240.120.216):

In Reply to: Re: 4020 engine torque?? posted by RodInNS on December 28, 2006 at 13:42:53:

At highewr rpms there is less time to fill and empty the cylinder per stroke.
A combustion chamber with a lighter fresh air chrage burns with less heat/pressure/thrust on the crankshaft.
Peak HP rpm is where the engine pumps the most airflow per minute. Peak torque is where the engine pumps the most air per stroke.
Just past peak torque rpm is usually where the engine is most efficient.
Running (good) the engine at peak torque rpms v.s beating an engine by lugging (bad)it at peak torque rpms are two different modes.
"Torque Rise/Power Bulge)" used to be a result of an engine's ability to pump air. Now with computer controled fuel injection rate/timing and variable boost pressure. The torque peak can be "flattened" or "peaked" as the marketing department sees fit.
New veicles often flatten 20-75 lb ft off the peak torque in order to increase drivetrain life.

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