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How can I find out how many horsepower my engine is?

Discussion in 'Freightliner Forum' started by expedite_it, Oct 9, 2020.

Page 5 of 5
  1. Oct 12, 2020 #41
    expedite_it

    expedite_it Road Train Member

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    But was Antinomian correct that 3.43's accelerate faster and pull loads up hills faster than 3.25's?
     
    expedite_it, Oct 12, 2020
    expedite_it, Oct 12, 2020
    #41
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  3. Oct 12, 2020 #42
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Yes, but the difference isn't all that great.

    I had same transmission and low profile 22.5s with 3.42 before, and have 3.25 now.

    This one has the Evolution engine, and is just as responsive as the other was.

    I've not seen 3.43, 3.42 is common.

    3.55 and 3.58 were more common. Not anymore.

    2.64 with a direct transmission was another common setup.
     
    25(2)+2, Oct 12, 2020
    25(2)+2, Oct 12, 2020
    #42
  4. Oct 12, 2020 #43
    expedite_it

    expedite_it Road Train Member

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    Which affects acceleration and pulling loads uphill more, horsepower or the differential? It sounds like you might disagree with Antinomian.


    What does low profile 22.5s mean?

    I know what a transmission is, but what is a direct transmission on a big rig? Do some big rigs have indirect transmissions?
     
    expedite_it, Oct 12, 2020
    expedite_it, Oct 12, 2020
    #43
  5. Oct 12, 2020 #44
    AModelCat

    AModelCat Road Train Member

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    Differential ratio makes next to zero difference in how fast you get up the hill. Horsepower is the ability to do work. That comes from what's under the hood. Different ratio might get you into a better spot in the powerband but its not going to make a noticeable difference IMO.
     
    AModelCat, Oct 12, 2020
    AModelCat, Oct 12, 2020
    #44
    Onemanshow, magoo68, 25(2)+2 and 1 other person Thank this.
  7. Oct 12, 2020 #45
    expedite_it

    expedite_it Road Train Member

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    What is the powerband?
     
    expedite_it, Oct 12, 2020
    expedite_it, Oct 12, 2020
    #45
  8. Oct 12, 2020 #46
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Direct means 1to1 final output ratio, most transmissions are overdrive coupled to a higher ratio differential. Direct has a bit less loss through the driveline, but requires a taller differential gear and is a tradeoff in durability.

    22.5 low profile is now the standard size for on pavement applications, but 11r 22.5 is a taller tire with more load capacity in the same load rating. Has slightly higher rolling resistance.

    24.5 low profile has roughly the same height as 11r 22.5, but rolling resistance is similar to the low profile 22.5.

    11r 24.5 is 2 inches larger diameter than 11r22.5.

    Load capacity and ground clearance are reasons to use tires other than 22.5 low profile.

    But will lose some fuel mileage.
     
    25(2)+2, Oct 12, 2020
    25(2)+2, Oct 12, 2020
    #46
    expedite_it Thanks this.
  9. Dec 29, 2020 #47
    born&raisedintheusa

    born&raisedintheusa Road Train Member

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    message deleted
     
    Last edited: Dec 29, 2020
    born&raisedintheusa, Dec 29, 2020
    born&raisedintheusa, Dec 29, 2020
    #47
  10. Dec 29, 2020 #48
    aussiejosh

    aussiejosh Road Train Member

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    That's easy its how many horses you can fit under the bonnet ( hood) .:cool: Ok all jokes aside the original calculation of a horsepower was from an experiment which set out to measure the power of a single horse. It was determined that a horse is capable of performing 33,000 ft-lbf of work per min.The definition of 1 Horsepower is displacing 1 lb. 33,000 ft. in one minute or 33,000 lb-ft / minute. 1HP = 1 lb x 33,000 ft / 1 minute , or Horsepower = Torque x RPM / 5,252 so if Torque was 1690 lb ft x 1600 rpm / 5252 = 515 hp.
     
    Last edited: Dec 29, 2020
    aussiejosh, Dec 29, 2020
    aussiejosh, Dec 29, 2020
    #48
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