You choose - loaded gas or basic diesel?

OhhWell wrote:

otrfun wrote:

OhhWell wrote:

otrfun wrote:

OhhWell wrote:

otrfun wrote:
As they say, torque does the real work, not horsepower.

Who in the heck says that? Torque is a measure of force and horsepower is a measure of WORK.

You can multiply torque through gearing. You can't increase your horsepower through anything besides upgrading the powerplant.

Definition of horsepower

I get your technical point; however, I believe you missed my point.

It's just a case of semantics. Notice my use of the word "real" work. I'm talking about work as defined by the average person:

"activity involving physical effort done in order to achieve a purpose or result"

If someone needs to haul or tow a lot, and wants to "achieve a purpose or result", which engine would be the better choice?

1. An engine with 400 HP and 200 ft. lbs. of torque.

2. An engine with 200 HP and 400 ft. lbs. of torque.

I think most would choose engine #2. Why? Because in the above scenario an abundance of torque allows them to "work" at "achieving a purpose or result" much easier than an abundance of horsepower.

I would pick engine 1 any day of the week. I might actually have to climb a hill at some point. I'm assuming that in this scenario, the same exact transmission isn't forced on both engines?

You're jokin', right?! If not, is it possible you have horsepower and torque confused? There's a reason why diesel engines are so popular--it's NOT because they have horsepower--it's because they have TORQUE. Again, torque pulls the trailers, hauls the goods, does the work in the realworld. If horsepower was doing all these great things why don't we see Indy 500-type engines powering big trucks? They're small, lightweight, and they produce 700+ horsepower. There's a reason why you'll never see one in a big truck--it's because they have very little torque.

P.S. I see your point about gearing down to increase torque. However, if this was an efficient process, can you explain why we don't see 700+ horsepower Indy 500-type engines powering big trucks?

I do not have horsepower and torque confused. I was wondering if perhaps you did? Torque doesn't pull ANYTHING is it a measure of force. It is a very important measurement but doesn't have squat to do with acceleration or top speed. If these high torque diesel engines could rev as high as gassers do, they would have insane amounts of horsepower.

The reason you don't see Indy Car engines in big trucks is due to longevity and fuel economy. Big trucks and diesel engine manufacturers don't spout out Torque numbers except (it appears) to the light duty truck consumers. Even there we are starting to see a horsepower push and race. Top speed calculations don't take torque into consideration at all, incline or not, it is all horsepower.

Luckily, diesel engines these days have more than enough horsepower as well so it's really all good. Your scenario you posed was too extreme. I wouldn't want to tow a heavy load up a decent hill with only 200hp no matter what the fuel type. You can scream TORQUE all you want but it isn't going to go very fast.

I totally and respectfully disagree. Please reread my previous posts referencing HP = Torque x RPM /5252. Using this formula, please explain why you would choose a 400 HP, 200 ft. lb. of torque engine that has to rev over 10,000 RPM as a practical truck engine. Until you address this, then I don't believe you have a credible argument.

"The general point I'm trying to make (with this formula) is that there is a give and take in terms of HP, Torque, and RPM. Some seem to think that HP is the cat's meow all by itself--that an engine with tons of HP will some how perform better under all conditions without any regard to its torque characteristics--that is simply not true. Again, HP is the product of Torque and RPM. Change one variable, and the other one or two variables must change, too."

otrfun wrote:

OhhWell wrote:

otrfun wrote:

OhhWell wrote:

otrfun wrote:
As they say, torque does the real work, not horsepower.

Who in the heck says that? Torque is a measure of force and horsepower is a measure of WORK.

You can multiply torque through gearing. You can't increase your horsepower through anything besides upgrading the powerplant.

Definition of horsepower

I get your technical point; however, I believe you missed my point.

It's just a case of semantics. Notice my use of the word "real" work. I'm talking about work as defined by the average person:

"activity involving physical effort done in order to achieve a purpose or result"

If someone needs to haul or tow a lot, and wants to "achieve a purpose or result", which engine would be the better choice?

1. An engine with 400 HP and 200 ft. lbs. of torque.

2. An engine with 200 HP and 400 ft. lbs. of torque.

I think most would choose engine #2. Why? Because in the above scenario an abundance of torque allows them to "work" at "achieving a purpose or result" much easier than an abundance of horsepower.

I would pick engine 1 any day of the week. I might actually have to climb a hill at some point. I'm assuming that in this scenario, the same exact transmission isn't forced on both engines?

You're jokin', right?! If not, is it possible you have horsepower and torque confused? There's a reason why diesel engines are so popular--it's NOT because they have horsepower--it's because they have TORQUE. Again, torque pulls the trailers, hauls the goods, does the work in the realworld. If horsepower was doing all these great things why don't we see Indy 500-type engines powering big trucks? They're small, lightweight, and they produce 700+ horsepower. There's a reason why you'll never see one in a big truck--it's because they have very little torque.

P.S. I see your point about gearing down to increase torque. However, if this was an efficient process, can you explain why we don't see 700+ horsepower Indy 500-type engines powering big trucks?

I do not have horsepower and torque confused. I was wondering if perhaps you did? Torque doesn't pull ANYTHING is it a measure of force. It is a very important measurement but doesn't have squat to do with acceleration or top speed. If these high torque diesel engines could rev as high as gassers do, they would have insane amounts of horsepower.

The reason you don't see Indy Car engines in big trucks is due to longevity and fuel economy. Big trucks and diesel engine manufacturers don't spout out Torque numbers except (it appears) to the light duty truck consumers. Even there we are starting to see a horsepower push and race. Top speed calculations don't take torque into consideration at all, incline or not, it is all horsepower.

Luckily, diesel engines these days have more than enough horsepower as well so it's really all good. Your scenario you posed was too extreme. I wouldn't want to tow a heavy load up a decent hill with only 200hp no matter what the fuel type. You can scream TORQUE all you want but it isn't going to go very fast.

B3yond Iris wrote:

otrfun wrote:

B3yond Iris wrote:

otrfun wrote:
Ok, time to refocus things. HP is a product of Torque and RPM (HP = TORQUE X RPM / 5252).

I'm not sure how that HP=Torque X RPM/5252 came into play,but I personally have never seen it come true for any engine

Take the 6.2L GM engine with
420HP @5600RPM
460 Torque @4100RPM
Following that formula it would be as following
HP=(460*4100)/5252 Which equals 359.101

The formula is just a general guideline. There are mass, friction, and combustion issues that enter into the overall design of an engine that are not reflected in this formula.

FWIW, I could be mistaken, but I believe this formula calculates the torque being produced at the same RPM when maximum HP is being produced. Using the numbers you provided (and this formula), 394 ft. lbs. of torque are being produced at the same time 420 HP is being produced at 5600 RPM.

The general point I'm trying to make (with this formula) is that there is a give and take in terms of HP, Torque, and RPM. Some seem to think that HP is the cat's meow all by itself--that an engine with tons of HP will some how perform better under all conditions without any regard to its torque characteristics--that is simply not true. Again, HP is the product of Torque and RPM. Change one variable, and the other one or two variables must change, too.

Thank you for explaining that. But thankfully with the way the engines have been able to produce their power its getting closer to the point where people can have their cake and eat it too.

Yup, engines have come a long way in the last 10-20 years. It's amazing how engineers have been able to increase HP and torque and decrease fuel consumption at the same time. I agree, it's almost like we can have our cake and eat it, too :)

otrfun wrote:

B3yond Iris wrote:

otrfun wrote:
Ok, time to refocus things. HP is a product of Torque and RPM (HP = TORQUE X RPM / 5252).

I'm not sure how that HP=Torque X RPM/5252 came into play,but I personally have never seen it come true for any engine

Take the 6.2L GM engine with
420HP @5600RPM
460 Torque @4100RPM
Following that formula it would be as following
HP=(460*4100)/5252 Which equals 359.101

The formula is just a general guideline. There are mass, friction, and combustion issues that enter into the overall design of an engine that are not reflected in this formula.

FWIW, I could be mistaken, but I believe this formula calculates the torque being produced at the same RPM when maximum HP is being produced. Using the numbers you provided (and this formula), 394 ft. lbs. of torque are being produced at the same time 420 HP is being produced at 5600 RPM.

The general point I'm trying to make (with this formula) is that there is a give and take in terms of HP, Torque, and RPM. Some seem to think that HP is the cat's meow all by itself--that an engine with tons of HP will some how perform better under all conditions without any regard to its torque characteristics--that is simply not true. Again, HP is the product of Torque and RPM. Change one variable, and the other one or two variables must change, too.

Thank you for explaining that. But thankfully with the way the engines have been able to produce their power its getting closer to the point where people can have their cake and eat it too.

B3yond Iris wrote:

otrfun wrote:
Ok, time to refocus things. HP is a product of Torque and RPM (HP = TORQUE X RPM / 5252).

I'm not sure how that HP=Torque X RPM/5252 came into play,but I personally have never seen it come true for any engine

Take the 6.2L GM engine with
420HP @5600RPM
460 Torque @4100RPM
Following that formula it would be as following
HP=(460*4100)/5252 Which equals 359.101

The formula is just a general guideline. There are mass, friction, and combustion issues that enter into the overall design of an engine that are not reflected in this formula.

FWIW, I could be mistaken, but I believe this formula calculates the torque being produced at the same RPM when maximum HP is being produced. Using the numbers you provided (and this formula), 394 ft. lbs. of torque are being produced at the same time 420 HP is being produced at 5600 RPM.

The general point I'm trying to make (with this formula) is that there is a give and take in terms of HP, Torque, and RPM. Some seem to think that HP is the cat's meow all by itself--that an engine with tons of HP will some how perform better under all conditions without any regard to its torque characteristics--that is simply not true. Again, HP is the product of Torque and RPM. Change one variable, and the other one or two variables must change, too.

otrfun wrote:
Ok, time to refocus things. HP is a product of Torque and RPM (HP = TORQUE X RPM / 5252).

I'm not sure how that HP=Torque X RPM/5252 came into play,but I personally have never seen it come true for any engine

Take the 6.2L GM engine with
420HP @5600RPM
460 Torque @4100RPM
Following that formula it would be as following
HP=(460*4100)/5252 Which equals 359.101

Ok, time to refocus things. HP is a product of Torque and RPM (HP = TORQUE X RPM / 5252).

As mentioned in a previous post, we have these two engine options for a truck that you intend to use for towing:

1. 400 HP, 10,500 RPM, 200 ft. lbs. of torque

2. 200 HP, 2,625 RPM, 400 ft. lbs. of torque

Both Jarlaxle and OhhWell seem to think that, hands-down, the better choice for a truck that's going to be used for towing is engine option #1. Yup, 400 HP is gonna accelerate nice, but I can't imagine trying to tow much with only 200 ft. lbs. of torque--not to mention having to listen to an engine rev to 10,500! My vote is for 400 ft. lbs. of torque and only 200 HP at a more leisurely 2625 RPM. For truck towing duties, my priority is torque, not horsepower. For a sports car, maybe I'd place a bit more priority on HP.

Which engine would you prefer to use (or listen to) while towing a heavy trailer up a 7% grade?

Jarlaxle wrote:
By that logic, tow with a Poppin' Johnny. LOTS of torque...but little POWER!

Repeat after me: one horsepower equals one horsepower! This is junior high school physics!

Physics in junior high school?! Maybe back in the 50's and 60's. Very rare these days.

By "that" logic? "That" equals what?

A Popping Johnny is not suitable for use as a truck engine. As you stated lotsa torque, but little to no HP. Neither is a 700 HP Indy 500-type engine--lotsa HP, but little torque. So, what's your point?

Ok, I'll repeat after you: 1 x HP = 1 x HP. Again, your point?

By that logic, tow with a Poppin' Johnny. LOTS of torque...but little POWER!

Repeat after me: one horsepower equals one horsepower! This is junior high school physics!

OhhWell wrote:

otrfun wrote:

OhhWell wrote:

otrfun wrote:
As they say, torque does the real work, not horsepower.

Who in the heck says that? Torque is a measure of force and horsepower is a measure of WORK.

You can multiply torque through gearing. You can't increase your horsepower through anything besides upgrading the powerplant.

Definition of horsepower

I get your technical point; however, I believe you missed my point.

It's just a case of semantics. Notice my use of the word "real" work. I'm talking about work as defined by the average person:

"activity involving physical effort done in order to achieve a purpose or result"

If someone needs to haul or tow a lot, and wants to "achieve a purpose or result", which engine would be the better choice?

1. An engine with 400 HP and 200 ft. lbs. of torque.

2. An engine with 200 HP and 400 ft. lbs. of torque.

I think most would choose engine #2. Why? Because in the above scenario an abundance of torque allows them to "work" at "achieving a purpose or result" much easier than an abundance of horsepower.

I would pick engine 1 any day of the week. I might actually have to climb a hill at some point. I'm assuming that in this scenario, the same exact transmission isn't forced on both engines?

You're jokin', right?! If not, is it possible you have horsepower and torque confused? There's a reason why diesel engines are so popular--it's NOT because they have horsepower--it's because they have TORQUE. Again, torque pulls the trailers, hauls the goods, does the work in the realworld. If horsepower was doing all these great things why don't we see Indy 500-type engines powering big trucks? They're small, lightweight, and they produce 700+ horsepower. There's a reason why you'll never see one in a big truck--it's because they have very little torque.

P.S. I see your point about gearing down to increase torque. However, if this was an efficient process, can you explain why we don't see 700+ horsepower Indy 500-type engines powering big trucks?