We're not always using 'max torque' because max HP occurs at higher rpm, and is
only utilized at that rpm. Slightly less torque at a higher rpm explains the disparity between max torque and max HP. (A minor acceptance of physical principles may help one to to understand this.)
Even without a carburetor or actual throttle
a diesel engine is 'ported' and 'timed' to operate most efficiently in a certain rpm range, regardless of what we learned building gasoline engines. (and regardless if for street racing.
). With
no load your diesel could easily rev to the moon if not governed in some way.
"Idle" is SO misunderstood. In a gas engine it's a "loafing" speed that keeps temps and oil splash or pump flow within design parameters. Most diesels can stay running at 600-800 rpm, but NOBODY should consider what results from 'backing a throttle off to its stop' is any indication of a 'healthy' no-load speed when at rest.
IMO we continue to defeat the advantage of "more HP" by running at lower rpm because we rarely use all of it!!! What used to be a 'wet stacking' hassle has become a 'regen' hassle. Please recognize if/when this is
your beef with current 'Tier IV' BS.
All those guys sticking up for 'properly predicated' DPF fitment and 'regen' cycles are likely keeping their rpm between say 1300 and PTO rpm. IMO, like many artists they may not be recognized in their lifetime. All five stars, gents!
btw, props to rademamj1 for
an education we dare not ignore. :thumbsup:
Lastly, apologies for the half pint of 'Captain' and resultant abject candor.
t o g
