| Author |
Message |
tech27
Guest
|
 Posted:
Fri Nov 12, 2004 11:28 pm Post subject:
How to make torque? |
|
|
That was a good Nascar thread. Lots of intelligent input from both sides.
Now here's something that I would like to get a better understanding of:
How does make torque? I know all about the hundreds of ways you can increase
horsepower, such as turbos, superchargers, intake and exhaust mods, etc.
etc. etc.
But how do you increase torque in a practical or even theoretical way? Is it
even possible to do on it's own, or is it a product of increased horsepower?
gearing? etc.
Thanks
|
|
| Back to top |
|
 |
Dave Plowman (News)
Guest
|
| Posted:
Fri Nov 12, 2004 11:28 pm Post subject:
Re: How to make torque? |
|
|
In article <Vi7ld.24711$NC6.1920@newsread1.mlpsca01.us.to.verio.net>,
tech27 <tech27@mail.anonymizer.com> wrote:
| Quote: | But how do you increase torque in a practical or even theoretical way?
Is it even possible to do on it's own, or is it a product of increased
horsepower? gearing? etc.
|
Within reason, extra capacity or forced induction (which is really the
same thing)
BHP is the product of torque and revs.
Altering gearing alters the torque at the driven wheels. If you increase
it you reduce speed (and increase fuel consumption).
--
*Black holes are where God divided by zero *
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound. |
|
| Back to top |
|
|
Ted Johnson
Guest
|
| Posted:
Sat Nov 13, 2004 12:31 am Post subject:
Re: How to make torque? |
|
|
| Quote: | Now here's something that I would like to get a better understanding of:
How does make torque? I know all about the hundreds of ways you can increase
horsepower, such as turbos, superchargers, intake and exhaust mods, etc.
etc. etc.
But how do you increase torque in a practical or even theoretical way? Is it
even possible to do on it's own, or is it a product of increased horsepower?
gearing? etc.
|
Excellent question.
And here's an excellent answer:
http://science.howstuffworks.com/fpte.htm/printable
In particular, check out:
o Fig 2: illustrates that torque is related to how far "away"
the connecting rod is from the center of the crankshaft
o Fig 3: example illustrating why a 400 hp Mustang Cobra has
350 ft-lbs of torque, yet a 400 hp diesel truck
has 1,600 ft-lbs of torque!
Regarding Fig 2, I initially thought the animation was broken,
then I realized (duh!) that in a 4-stroke engine, only 1 of
the strokes (power stroke) produces torque! :-]
-Ted
|
|
| Back to top |
|
|
Dave Plowman (News)
Guest
|
| Posted:
Sat Nov 13, 2004 1:45 am Post subject:
Re: How to make torque? |
|
|
In article <pan.2004.11.12.23.49.10.269366@entrophy-free.net>,
Jim Levie <jim@entrophy-free.net> wrote:
| Quote: | The factors that determine torque are the piston area, cylinder pressure
and the distance from the center of crank to the center of a con rod
throw. On an existing engine only cylinder pressure can be easily changed
by increasing the combustion charge with forced induction (turbo or
supercharging).
|
Don't know about easy. ;-)
Valve timing has an effect on torque too - which is why variable timing is
such a benefit.
--
*Who is this General Failure chap anyway - and why is he reading my HD? *
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound. |
|
| Back to top |
|
|
tech27
Guest
|
| Posted:
Sat Nov 13, 2004 2:39 am Post subject:
Re: How to make torque? |
|
|
"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in message
news:4d0cd0af27dave@davenoise.co.uk...
| Quote: | In article <Vi7ld.24711$NC6.1920@newsread1.mlpsca01.us.to.verio.net>,
tech27 <tech27@mail.anonymizer.com> wrote:
But how do you increase torque in a practical or even theoretical way?
Is it even possible to do on it's own, or is it a product of increased
horsepower? gearing? etc.
Within reason, extra capacity or forced induction (which is really the
same thing)
BHP is the product of torque and revs.
Altering gearing alters the torque at the driven wheels. If you increase
it you reduce speed (and increase fuel consumption).
--
*Black holes are where God divided by zero *
Dave Plowman dave@davenoise.co.uk London SW
|
Excellent explanation. So if one wanted a very torquey (not to be confused
with the famous English countryside), one could change the gears so that the
car would rev much much higher, but the top speed in the gear would be much
much lower? |
|
| Back to top |
|
|
tech27
Guest
|
| Posted:
Sat Nov 13, 2004 2:41 am Post subject:
Re: How to make torque? |
|
|
"Ted Johnson" <ted@estaff05.mayfield.hp.com> wrote in message
news:cn332g$nm9@estaff05.mayfield.hp.com...
| Quote: | Now here's something that I would like to get a better understanding of:
How does make torque? I know all about the hundreds of ways you can
increase
horsepower, such as turbos, superchargers, intake and exhaust mods, etc.
etc. etc.
But how do you increase torque in a practical or even theoretical way? Is
it
even possible to do on it's own, or is it a product of increased
horsepower?
gearing? etc.
Excellent question.
And here's an excellent answer:
http://science.howstuffworks.com/fpte.htm/printable
In particular, check out:
o Fig 2: illustrates that torque is related to how far "away"
the connecting rod is from the center of the crankshaft
o Fig 3: example illustrating why a 400 hp Mustang Cobra has
350 ft-lbs of torque, yet a 400 hp diesel truck
has 1,600 ft-lbs of torque!
Regarding Fig 2, I initially thought the animation was broken,
then I realized (duh!) that in a 4-stroke engine, only 1 of
the strokes (power stroke) produces torque! :-]
-Ted
|
Yes, excellent answer. Thanks. BTW-did you notice that the car in Fig. 1
seems to have a BMW roundel on the driver door? (-; |
|
| Back to top |
|
|
Jim Levie
Guest
|
| Posted:
Sat Nov 13, 2004 4:49 am Post subject:
Re: How to make torque? |
|
|
On Fri, 12 Nov 2004 19:00:47 +0000, Dave Plowman (News) wrote:
| Quote: | In article <Vi7ld.24711$NC6.1920@newsread1.mlpsca01.us.to.verio.net>,
tech27 <tech27@mail.anonymizer.com> wrote:
But how do you increase torque in a practical or even theoretical way?
Is it even possible to do on it's own, or is it a product of increased
horsepower? gearing? etc.
Within reason, extra capacity or forced induction (which is really the
same thing)
The factors that determine torque are the piston area, cylinder pressure |
and the distance from the center of crank to the center of a con rod
throw. On an existing engine only cylinder pressure can be easily changed
by increasing the combustion charge with forced induction (turbo or
supercharging).
| Quote: | BHP is the product of torque and revs.
Altering gearing alters the torque at the driven wheels. If you increase
it you reduce speed (and increase fuel consumption).
|
--
The instructions said to use Windows 98 or better, so I installed RedHat. |
|
| Back to top |
|
|
dizzy
Guest
|
| Posted:
Sat Nov 13, 2004 5:21 am Post subject:
Re: How to make torque? |
|
|
On Fri, 12 Nov 2004 13:28:57 -0500, "tech27"
<tech27@mail.anonymizer.com> wrote:
| Quote: | That was a good Nascar thread. Lots of intelligent input from both sides.
Now here's something that I would like to get a better understanding of:
How does make torque? I know all about the hundreds of ways you can increase
horsepower, such as turbos, superchargers, intake and exhaust mods, etc.
etc. etc.
But how do you increase torque in a practical or even theoretical way? Is it
even possible to do on it's own, or is it a product of increased horsepower?
gearing? etc.
|
Well, it's easy to increase force, at the expense of velocity... Or
in this case torque, at the expense of angular velocity or RPMs... |
|
| Back to top |
|
|
Fred W
Guest
|
| Posted:
Sun Nov 14, 2004 5:40 pm Post subject:
Re: How to make torque? |
|
|
Ted Johnson wrote:
| Quote: | Now here's something that I would like to get a better understanding of:
How does make torque? I know all about the hundreds of ways you can increase
horsepower, such as turbos, superchargers, intake and exhaust mods, etc.
etc. etc.
But how do you increase torque in a practical or even theoretical way? Is it
even possible to do on it's own, or is it a product of increased horsepower?
gearing? etc.
Excellent question.
|
I have heard that the difference between a good question and an
excellent one is; "An excellent question is one to which I know the
answer!"
-Fred W |
|
| Back to top |
|
|
|
|
|
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in