Thanks for this. Always preferred engines with more HP at low rpms, which turns out to be those engines with more torque at low rpms. Never was interested in peak HP at very high rpms.
But having a little problem with "duty cycle" bits.
Are you just saying that a diesel with the same HP as a gas engine should last longer? IOW the hours of runtime before rebuild is higher for a diesel. Yes, that seems right.
And if you run either engine at lower than their max HP they will last longer? (your "short gear" example, and "Duty cycle goes down as HP goes up"). That seems right too.
Just not sure if I'm missing anything here.
Thanks.
Turtle n Peeps wrote:
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Duty cycle : The cycle of operation of a machine or other device that operates intermittently rather than continuously.
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Now where a short gear will help is with duty cycle. Remember, even the big guy will get tired and if he has a long lever, he will be able to work longer and with less effort. (It will also take longer to do his work with a longer lever)
Duty cycle goes down as HP goes up.
Two different engines with the same HP can have WAAAAAY different duty cycles.
EX: My 2006 Duramax has 360 HP. The 3.5 Ecoboost has 365 HP. On a hot day my Dmax has a WAAAAAAY higher duty cycle than the Ecoboost. It all has to do with how an engine is designed. It has nothing to do with it's a gasoline or diesel engine thing. Diesels "usually" have a higher duty cycle although there are industrial gasoline engines out there that have extremely high duty cycles compared to a light duty diesel pickup engine. Again, it's a design thing and not a diesel/gas thing.
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