Which is better: apples? or apple pie?

A given engine will put out a certain amount of torque. Make the engine bigger and it can put out more torque. Bigger apples - bigger apple pie.

Ignoring the unit conversions and efficiencies for the sake of discussion, the HP is the product of torque and RPM. Torque x RPM = HP. Bigger torque gives you bigger power but so does bigger RPM.

Because HP is torque multiplied by RPM, you can get more power from the same amount of torque if you make the same amount of torque at a higher RPM. This is why we pick aftermarket cams... because we want to move the torque curve higher up the rpm band - to make more power.

Start with a stock engine baseline. If you increase the bore and stroke with all else being equal, you will get more torque everywhere and since bigger torque x same RPM = bigger HP! You have more torque now, so the HP is now bigger.

If you want even more HP with the new bored and stroked setup, you can change the cam to move the same peak torque to occur at a higher RPM. Cams basicaly move the torque peak around the RPM band with all else being equal. Since this new cam will have your peak torque moved up to a higher RPM, you get more HP. Bigger torque from the bore and stroke plus multiply that bigger torque by the higher RPM where the torque peak exists = yet even more HP. Simple math really.

It's all about the stickers after that.

-Mark.

 

Did anybody say torque???

 

only if you use the SAE system If you use the metric system it''s a different constant (the graphs cross at an rpm of somewhere in the 7000s..forgot the exact number 5252 is the rpm # where a dyno graph has intersecting HP and TQ lines...but only if both are plotted on equal scale)

 

I love apple pie, and thats why I have more decals, its makes it look fast even with me driving, trust me I'm slow, decals X torque X RPM = visual HP

 

Yeh, I know what you mean Better to look like the baddess azz on the road than to step on it and remove all doubt

Sure wish I hadn't open this thread....talk about mental ************ Sort of reminds me of what makes your light bulb light.....Volts or amps..

Bullshark

 

Bullshark
Thats easy "THE SWITCH" makes it light.
Larry

 

Torque is how much work is being done....HP is how fast that work is being done.

 

Best explanation I have heard yet.

 

All correct.....but THRUST gets you going after you already left !

Bottomline...the acceleration you feel is only possible due to the activation of excess power that is not being used in the current state of motion.

These are both Big Blocks! Turn the volume up!

Zero to 450 mph / 9 seconds - then continue to 900 mph prior to one minute!

http://raf.union.rpi.edu/downloads/f18_ride.wmv

http://www.unl.edu/afrotc/cadet/videos/B1B.MPG

enjoy..........

 

Bob,

Good one!

 

Very cool.

 

Actually torque is the amount of force applied, not the work done. You can generate 800 lb./ft. of torque at 0 rpm. (picture a breaker bar, fixed at one end, with a weight hanging from the other) No work is being done (0 HP), yet torque is being applied. DC electric motors generate the most torque at 0 RPM. This means that they generate 0 HP at their torque peak.

Horsepower is a measure of the ability to do work over time.

You can't just look at peak values for HP & torque. The key value is area under the torque curve. Peak values are simply a snapshot at one RPM, and don't tell the whole story.

This is high school physics, not rocket science.

 

Some people never had physics. Some may have taken the class so long ago they don't remember much. Then threads like this pop up and make things even more confusing. I prefer to think of Torque as force and Horsepower as the rate of doing work.

 

Torque is a force. HP is work.

Last I checked you get forced back into your seat.

 

Torque is measured in foot-pounds.

1 Horsepower = 550 foot-pounds per second.

 

Torque is great and all,..especially on the street. But let's don't carried away.

At the drags, it's HP that's king.

Disagree? Ok, on the dragstrip you shift 200 RPM past peak torque and I'll shift 200 RPM past peak HP and we'll see who wins.

Still disagree? A diesel engine will out-torque most any gasoline engine, all things equal. Do you see any Vettes or Camaros at the drags with a Cummins diesel?

 

All things equal??????
There is no comparison
Yes a 380HP Cummins with 855 cubic inches will produce over 1,000 pounds of torque... It also weighs around 2,700 pounds........ plus it wont fit in a camaro

 

Dont tell the St.Louis Rams that... let the other team score quick so they can get their offense back on the field...it worked one yr...

 

I can't recall seeing any. I also can't recall seeing any Mack trucks at the drag strip running a small block chevy.

 

Well, my co-worker admited defeat. This subject has obviously struck a nerve with some folks.